diff --git a/homeassistant/components/group/binary_sensor.py b/homeassistant/components/group/binary_sensor.py
index 54a98a68e43..ff0e58badfb 100644
--- a/homeassistant/components/group/binary_sensor.py
+++ b/homeassistant/components/group/binary_sensor.py
@@ -132,7 +132,7 @@ class BinarySensorGroup(GroupEntity, BinarySensorEntity):
         # filtered_states are members currently in the state machine
         filtered_states: list[str] = [x.state for x in all_states if x is not None]
 
-        # Set group as unavailable if all members are unavailable
+        # Set group as unavailable if all members are unavailable or missing
         self._attr_available = any(
             state != STATE_UNAVAILABLE for state in filtered_states
         )
diff --git a/tests/components/group/test_binary_sensor.py b/tests/components/group/test_binary_sensor.py
index a0872b11f16..fbc19904faa 100644
--- a/tests/components/group/test_binary_sensor.py
+++ b/tests/components/group/test_binary_sensor.py
@@ -50,7 +50,13 @@ async def test_default_state(hass):
 
 
 async def test_state_reporting_all(hass):
-    """Test the state reporting."""
+    """Test the state reporting in 'all' mode.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if at least one group member is unknown or unavailable.
+    Otherwise, the group state is off if at least one group member is off.
+    Otherwise, the group state is on.
+    """
     await async_setup_component(
         hass,
         BINARY_SENSOR_DOMAIN,
@@ -68,26 +74,12 @@ async def test_state_reporting_all(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
-    hass.states.async_set("binary_sensor.test1", STATE_ON)
-    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
-
-    hass.states.async_set("binary_sensor.test1", STATE_ON)
-    hass.states.async_set("binary_sensor.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
-
-    hass.states.async_set("binary_sensor.test1", STATE_OFF)
-    hass.states.async_set("binary_sensor.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
-
-    hass.states.async_set("binary_sensor.test1", STATE_ON)
-    hass.states.async_set("binary_sensor.test2", STATE_ON)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
+    # Initial state with no group member in the state machine -> unavailable
+    assert (
+        hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNAVAILABLE
+    )
 
+    # All group members unavailable -> unavailable
     hass.states.async_set("binary_sensor.test1", STATE_UNAVAILABLE)
     hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
@@ -95,6 +87,12 @@ async def test_state_reporting_all(hass):
         hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNAVAILABLE
     )
 
+    # At least one member unknown or unavailable -> group unknown
+    hass.states.async_set("binary_sensor.test1", STATE_ON)
+    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+
     hass.states.async_set("binary_sensor.test1", STATE_ON)
     hass.states.async_set("binary_sensor.test2", STATE_UNKNOWN)
     await hass.async_block_till_done()
@@ -105,9 +103,55 @@ async def test_state_reporting_all(hass):
     await hass.async_block_till_done()
     assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
 
+    hass.states.async_set("binary_sensor.test1", STATE_OFF)
+    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("binary_sensor.test1", STATE_OFF)
+    hass.states.async_set("binary_sensor.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("binary_sensor.test1", STATE_UNKNOWN)
+    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+
+    # At least one member off -> group off
+    hass.states.async_set("binary_sensor.test1", STATE_ON)
+    hass.states.async_set("binary_sensor.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
+
+    hass.states.async_set("binary_sensor.test1", STATE_OFF)
+    hass.states.async_set("binary_sensor.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
+
+    # Otherwise -> on
+    hass.states.async_set("binary_sensor.test1", STATE_ON)
+    hass.states.async_set("binary_sensor.test2", STATE_ON)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
+
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("binary_sensor.test1")
+    hass.states.async_remove("binary_sensor.test2")
+    await hass.async_block_till_done()
+    assert (
+        hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNAVAILABLE
+    )
+
 
 async def test_state_reporting_any(hass):
-    """Test the state reporting."""
+    """Test the state reporting in 'any' mode.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if all group members are unknown.
+    Otherwise, the group state is on if at least one group member is on.
+    Otherwise, the group state is off.
+    """
     await async_setup_component(
         hass,
         BINARY_SENSOR_DOMAIN,
@@ -126,26 +170,17 @@ async def test_state_reporting_any(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
-    hass.states.async_set("binary_sensor.test1", STATE_ON)
-    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
+    entity_registry = er.async_get(hass)
+    entry = entity_registry.async_get("binary_sensor.binary_sensor_group")
+    assert entry
+    assert entry.unique_id == "unique_identifier"
 
-    hass.states.async_set("binary_sensor.test1", STATE_ON)
-    hass.states.async_set("binary_sensor.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
-
-    hass.states.async_set("binary_sensor.test1", STATE_OFF)
-    hass.states.async_set("binary_sensor.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
-
-    hass.states.async_set("binary_sensor.test1", STATE_ON)
-    hass.states.async_set("binary_sensor.test2", STATE_ON)
-    await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
+    # Initial state with no group member in the state machine -> unavailable
+    assert (
+        hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNAVAILABLE
+    )
 
+    # All group members unavailable -> unavailable
     hass.states.async_set("binary_sensor.test1", STATE_UNAVAILABLE)
     hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
@@ -153,17 +188,59 @@ async def test_state_reporting_any(hass):
         hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNAVAILABLE
     )
 
-    entity_registry = er.async_get(hass)
-    entry = entity_registry.async_get("binary_sensor.binary_sensor_group")
-    assert entry
-    assert entry.unique_id == "unique_identifier"
+    # All group members unknown -> unknown
+    hass.states.async_set("binary_sensor.test1", STATE_UNKNOWN)
+    hass.states.async_set("binary_sensor.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+
+    # Group members unknown or unavailable -> unknown
+    hass.states.async_set("binary_sensor.test1", STATE_UNKNOWN)
+    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+
+    # At least one member on -> group on
+    hass.states.async_set("binary_sensor.test1", STATE_ON)
+    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
+
+    hass.states.async_set("binary_sensor.test1", STATE_ON)
+    hass.states.async_set("binary_sensor.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
+
+    hass.states.async_set("binary_sensor.test1", STATE_ON)
+    hass.states.async_set("binary_sensor.test2", STATE_ON)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
 
     hass.states.async_set("binary_sensor.test1", STATE_ON)
     hass.states.async_set("binary_sensor.test2", STATE_UNKNOWN)
     await hass.async_block_till_done()
     assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_ON
 
-    hass.states.async_set("binary_sensor.test1", STATE_UNKNOWN)
-    hass.states.async_set("binary_sensor.test2", STATE_UNKNOWN)
+    # Otherwise -> off
+    hass.states.async_set("binary_sensor.test1", STATE_OFF)
+    hass.states.async_set("binary_sensor.test2", STATE_OFF)
     await hass.async_block_till_done()
-    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNKNOWN
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
+
+    hass.states.async_set("binary_sensor.test1", STATE_UNKNOWN)
+    hass.states.async_set("binary_sensor.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
+
+    hass.states.async_set("binary_sensor.test1", STATE_UNAVAILABLE)
+    hass.states.async_set("binary_sensor.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("binary_sensor.binary_sensor_group").state == STATE_OFF
+
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("binary_sensor.test1")
+    hass.states.async_remove("binary_sensor.test2")
+    await hass.async_block_till_done()
+    assert (
+        hass.states.get("binary_sensor.binary_sensor_group").state == STATE_UNAVAILABLE
+    )
diff --git a/tests/components/group/test_cover.py b/tests/components/group/test_cover.py
index d090141a9d2..83c85a70b63 100644
--- a/tests/components/group/test_cover.py
+++ b/tests/components/group/test_cover.py
@@ -33,6 +33,7 @@ from homeassistant.const import (
     STATE_CLOSING,
     STATE_OPEN,
     STATE_OPENING,
+    STATE_UNAVAILABLE,
     STATE_UNKNOWN,
 )
 from homeassistant.helpers import entity_registry as er
@@ -99,7 +100,14 @@ async def setup_comp(hass, config_count):
 
 @pytest.mark.parametrize("config_count", [(CONFIG_ATTRIBUTES, 1)])
 async def test_state(hass, setup_comp):
-    """Test handling of state."""
+    """Test handling of state.
+
+    The group state is unknown if all group members are unknown or unavailable.
+    Otherwise, the group state is opening if at least one group member is opening.
+    Otherwise, the group state is closing if at least one group member is closing.
+    Otherwise, the group state is open if at least one group member is open.
+    Otherwise, the group state is closed.
+    """
     state = hass.states.get(COVER_GROUP)
     # No entity has a valid state -> group state unknown
     assert state.state == STATE_UNKNOWN
@@ -115,87 +123,125 @@ async def test_state(hass, setup_comp):
     assert ATTR_CURRENT_POSITION not in state.attributes
     assert ATTR_CURRENT_TILT_POSITION not in state.attributes
 
-    # Set all entities as closed -> group state closed
-    hass.states.async_set(DEMO_COVER, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_CLOSED
+    # The group state is unknown if all group members are unknown or unavailable.
+    for state_1 in (STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(DEMO_COVER, state_1, {})
+                hass.states.async_set(DEMO_COVER_POS, state_2, {})
+                hass.states.async_set(DEMO_COVER_TILT, state_3, {})
+                hass.states.async_set(DEMO_TILT, STATE_UNAVAILABLE, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(COVER_GROUP)
+                assert state.state == STATE_UNKNOWN
 
-    # Set all entities as open -> group state open
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_OPEN, {})
-    hass.states.async_set(DEMO_TILT, STATE_OPEN, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_OPEN
+    for state_1 in (STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(DEMO_COVER, state_1, {})
+                hass.states.async_set(DEMO_COVER_POS, state_2, {})
+                hass.states.async_set(DEMO_COVER_TILT, state_3, {})
+                hass.states.async_set(DEMO_TILT, STATE_UNKNOWN, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(COVER_GROUP)
+                assert state.state == STATE_UNKNOWN
 
-    # Set first entity as open -> group state open
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_OPEN
+    # At least one member opening -> group opening
+    for state_1 in (
+        STATE_CLOSED,
+        STATE_CLOSING,
+        STATE_OPEN,
+        STATE_OPENING,
+        STATE_UNAVAILABLE,
+        STATE_UNKNOWN,
+    ):
+        for state_2 in (
+            STATE_CLOSED,
+            STATE_CLOSING,
+            STATE_OPEN,
+            STATE_OPENING,
+            STATE_UNAVAILABLE,
+            STATE_UNKNOWN,
+        ):
+            for state_3 in (
+                STATE_CLOSED,
+                STATE_CLOSING,
+                STATE_OPEN,
+                STATE_OPENING,
+                STATE_UNAVAILABLE,
+                STATE_UNKNOWN,
+            ):
+                hass.states.async_set(DEMO_COVER, state_1, {})
+                hass.states.async_set(DEMO_COVER_POS, state_2, {})
+                hass.states.async_set(DEMO_COVER_TILT, state_3, {})
+                hass.states.async_set(DEMO_TILT, STATE_OPENING, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(COVER_GROUP)
+                assert state.state == STATE_OPENING
 
-    # Set last entity as open -> group state open
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_OPEN
+    # At least one member closing -> group closing
+    for state_1 in (
+        STATE_CLOSED,
+        STATE_CLOSING,
+        STATE_OPEN,
+        STATE_UNAVAILABLE,
+        STATE_UNKNOWN,
+    ):
+        for state_2 in (
+            STATE_CLOSED,
+            STATE_CLOSING,
+            STATE_OPEN,
+            STATE_UNAVAILABLE,
+            STATE_UNKNOWN,
+        ):
+            for state_3 in (
+                STATE_CLOSED,
+                STATE_CLOSING,
+                STATE_OPEN,
+                STATE_UNAVAILABLE,
+                STATE_UNKNOWN,
+            ):
+                hass.states.async_set(DEMO_COVER, state_1, {})
+                hass.states.async_set(DEMO_COVER_POS, state_2, {})
+                hass.states.async_set(DEMO_COVER_TILT, state_3, {})
+                hass.states.async_set(DEMO_TILT, STATE_CLOSING, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(COVER_GROUP)
+                assert state.state == STATE_CLOSING
 
-    # Set conflicting valid states -> opening state has priority
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_OPENING, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_CLOSING, {})
-    hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_OPENING
+    # At least one member open -> group open
+    for state_1 in (STATE_CLOSED, STATE_OPEN, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_CLOSED, STATE_OPEN, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_CLOSED, STATE_OPEN, STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(DEMO_COVER, state_1, {})
+                hass.states.async_set(DEMO_COVER_POS, state_2, {})
+                hass.states.async_set(DEMO_COVER_TILT, state_3, {})
+                hass.states.async_set(DEMO_TILT, STATE_OPEN, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(COVER_GROUP)
+                assert state.state == STATE_OPEN
 
-    # Set all entities to unknown state -> group state unknown
-    hass.states.async_set(DEMO_COVER, STATE_UNKNOWN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_UNKNOWN, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_UNKNOWN, {})
-    hass.states.async_set(DEMO_TILT, STATE_UNKNOWN, {})
+    # At least one member closed -> group closed
+    for state_1 in (STATE_CLOSED, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_CLOSED, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_CLOSED, STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(DEMO_COVER, state_1, {})
+                hass.states.async_set(DEMO_COVER_POS, state_2, {})
+                hass.states.async_set(DEMO_COVER_TILT, state_3, {})
+                hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(COVER_GROUP)
+                assert state.state == STATE_CLOSED
+
+    # All group members removed from the state machine -> unknown
+    hass.states.async_remove(DEMO_COVER)
+    hass.states.async_remove(DEMO_COVER_POS)
+    hass.states.async_remove(DEMO_COVER_TILT)
+    hass.states.async_remove(DEMO_TILT)
     await hass.async_block_till_done()
     state = hass.states.get(COVER_GROUP)
     assert state.state == STATE_UNKNOWN
 
-    # Set one entity to unknown state -> open state has priority
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_UNKNOWN, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_CLOSED, {})
-    hass.states.async_set(DEMO_TILT, STATE_OPEN, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_OPEN
-
-    # Set one entity to unknown state -> opening state has priority
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_OPENING, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_UNKNOWN, {})
-    hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_OPENING
-
-    # Set one entity to unknown state -> closing state has priority
-    hass.states.async_set(DEMO_COVER, STATE_OPEN, {})
-    hass.states.async_set(DEMO_COVER_POS, STATE_UNKNOWN, {})
-    hass.states.async_set(DEMO_COVER_TILT, STATE_CLOSING, {})
-    hass.states.async_set(DEMO_TILT, STATE_CLOSED, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(COVER_GROUP)
-    assert state.state == STATE_CLOSING
-
 
 @pytest.mark.parametrize("config_count", [(CONFIG_ATTRIBUTES, 1)])
 async def test_attributes(hass, setup_comp):
diff --git a/tests/components/group/test_fan.py b/tests/components/group/test_fan.py
index 19b4fe4670a..8aefd12c93a 100644
--- a/tests/components/group/test_fan.py
+++ b/tests/components/group/test_fan.py
@@ -33,6 +33,8 @@ from homeassistant.const import (
     CONF_UNIQUE_ID,
     STATE_OFF,
     STATE_ON,
+    STATE_UNAVAILABLE,
+    STATE_UNKNOWN,
 )
 from homeassistant.core import CoreState
 from homeassistant.helpers import entity_registry as er
@@ -111,7 +113,11 @@ async def setup_comp(hass, config_count):
 
 @pytest.mark.parametrize("config_count", [(CONFIG_ATTRIBUTES, 1)])
 async def test_state(hass, setup_comp):
-    """Test handling of state."""
+    """Test handling of state.
+
+    The group state is on if at least one group member is on.
+    Otherwise, the group state is off.
+    """
     state = hass.states.get(FAN_GROUP)
     # No entity has a valid state -> group state off
     assert state.state == STATE_OFF
@@ -123,41 +129,55 @@ async def test_state(hass, setup_comp):
     assert ATTR_ASSUMED_STATE not in state.attributes
     assert state.attributes[ATTR_SUPPORTED_FEATURES] == 0
 
-    # Set all entities as on -> group state on
-    hass.states.async_set(CEILING_FAN_ENTITY_ID, STATE_ON, {})
-    hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, STATE_ON, {})
-    hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, STATE_ON, {})
-    hass.states.async_set(PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_ON, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(FAN_GROUP)
-    assert state.state == STATE_ON
+    # The group state is off if all group members are off, unknown or unavailable.
+    for state_1 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(CEILING_FAN_ENTITY_ID, state_1, {})
+                hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, state_2, {})
+                hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, state_3, {})
+                hass.states.async_set(PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_OFF, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(FAN_GROUP)
+                assert state.state == STATE_OFF
 
-    # Set all entities as off -> group state off
-    hass.states.async_set(CEILING_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_OFF, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(FAN_GROUP)
-    assert state.state == STATE_OFF
+    for state_1 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(CEILING_FAN_ENTITY_ID, state_1, {})
+                hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, state_2, {})
+                hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, state_3, {})
+                hass.states.async_set(
+                    PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_UNAVAILABLE, {}
+                )
+                await hass.async_block_till_done()
+                state = hass.states.get(FAN_GROUP)
+                assert state.state == STATE_OFF
 
-    # Set first entity as on -> group state on
-    hass.states.async_set(CEILING_FAN_ENTITY_ID, STATE_ON, {})
-    hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_OFF, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(FAN_GROUP)
-    assert state.state == STATE_ON
+    for state_1 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(CEILING_FAN_ENTITY_ID, state_1, {})
+                hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, state_2, {})
+                hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, state_3, {})
+                hass.states.async_set(
+                    PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_UNKNOWN, {}
+                )
+                await hass.async_block_till_done()
+                state = hass.states.get(FAN_GROUP)
+                assert state.state == STATE_OFF
 
-    # Set last entity as on -> group state on
-    hass.states.async_set(CEILING_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, STATE_OFF, {})
-    hass.states.async_set(PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_ON, {})
-    await hass.async_block_till_done()
-    state = hass.states.get(FAN_GROUP)
-    assert state.state == STATE_ON
+    # At least one member on -> group on
+    for state_1 in (STATE_OFF, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        for state_2 in (STATE_OFF, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            for state_3 in (STATE_OFF, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN):
+                hass.states.async_set(CEILING_FAN_ENTITY_ID, state_1, {})
+                hass.states.async_set(LIVING_ROOM_FAN_ENTITY_ID, state_2, {})
+                hass.states.async_set(PERCENTAGE_FULL_FAN_ENTITY_ID, state_3, {})
+                hass.states.async_set(PERCENTAGE_LIMITED_FAN_ENTITY_ID, STATE_ON, {})
+                await hass.async_block_till_done()
+                state = hass.states.get(FAN_GROUP)
+                assert state.state == STATE_ON
 
     # now remove an entity
     hass.states.async_remove(PERCENTAGE_LIMITED_FAN_ENTITY_ID)
@@ -167,6 +187,16 @@ async def test_state(hass, setup_comp):
     assert ATTR_ASSUMED_STATE not in state.attributes
     assert state.attributes[ATTR_SUPPORTED_FEATURES] == 0
 
+    # now remove all entities
+    hass.states.async_remove(CEILING_FAN_ENTITY_ID)
+    hass.states.async_remove(LIVING_ROOM_FAN_ENTITY_ID)
+    hass.states.async_remove(PERCENTAGE_FULL_FAN_ENTITY_ID)
+    await hass.async_block_till_done()
+    state = hass.states.get(FAN_GROUP)
+    assert state.state == STATE_OFF
+    assert ATTR_ASSUMED_STATE not in state.attributes
+    assert state.attributes[ATTR_SUPPORTED_FEATURES] == 0
+
     # Test entity registry integration
     entity_registry = er.async_get(hass)
     entry = entity_registry.async_get(FAN_GROUP)
diff --git a/tests/components/group/test_light.py b/tests/components/group/test_light.py
index d5f7abedb44..f3083812553 100644
--- a/tests/components/group/test_light.py
+++ b/tests/components/group/test_light.py
@@ -88,8 +88,14 @@ async def test_default_state(hass):
     assert entry.unique_id == "unique_identifier"
 
 
-async def test_state_reporting(hass):
-    """Test the state reporting."""
+async def test_state_reporting_any(hass):
+    """Test the state reporting in 'any' mode.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if all group members are unknown.
+    Otherwise, the group state is on if at least one group member is on.
+    Otherwise, the group state is off.
+    """
     await async_setup_component(
         hass,
         LIGHT_DOMAIN,
@@ -105,29 +111,79 @@ async def test_state_reporting(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
-    hass.states.async_set("light.test1", STATE_ON)
-    hass.states.async_set("light.test2", STATE_UNAVAILABLE)
-    await hass.async_block_till_done()
-    assert hass.states.get("light.light_group").state == STATE_ON
-
-    hass.states.async_set("light.test1", STATE_ON)
-    hass.states.async_set("light.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("light.light_group").state == STATE_ON
-
-    hass.states.async_set("light.test1", STATE_OFF)
-    hass.states.async_set("light.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("light.light_group").state == STATE_OFF
+    # Initial state with no group member in the state machine -> unavailable
+    assert hass.states.get("light.light_group").state == STATE_UNAVAILABLE
 
+    # All group members unavailable -> unavailable
     hass.states.async_set("light.test1", STATE_UNAVAILABLE)
     hass.states.async_set("light.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
     assert hass.states.get("light.light_group").state == STATE_UNAVAILABLE
 
+    # All group members unknown -> unknown
+    hass.states.async_set("light.test1", STATE_UNKNOWN)
+    hass.states.async_set("light.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    # Group members unknown or unavailable -> unknown
+    hass.states.async_set("light.test1", STATE_UNKNOWN)
+    hass.states.async_set("light.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    # At least one member on -> group on
+    hass.states.async_set("light.test1", STATE_ON)
+    hass.states.async_set("light.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_ON
+
+    hass.states.async_set("light.test1", STATE_ON)
+    hass.states.async_set("light.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_ON
+
+    hass.states.async_set("light.test1", STATE_ON)
+    hass.states.async_set("light.test2", STATE_ON)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_ON
+
+    hass.states.async_set("light.test1", STATE_ON)
+    hass.states.async_set("light.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_ON
+
+    # Otherwise -> off
+    hass.states.async_set("light.test1", STATE_OFF)
+    hass.states.async_set("light.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_OFF
+
+    hass.states.async_set("light.test1", STATE_UNKNOWN)
+    hass.states.async_set("light.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_OFF
+
+    hass.states.async_set("light.test1", STATE_UNAVAILABLE)
+    hass.states.async_set("light.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_OFF
+
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("light.test1")
+    hass.states.async_remove("light.test2")
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNAVAILABLE
+
 
 async def test_state_reporting_all(hass):
-    """Test the state reporting."""
+    """Test the state reporting in 'all' mode.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if at least one group member is unknown or unavailable.
+    Otherwise, the group state is off if at least one group member is off.
+    Otherwise, the group state is on.
+    """
     await async_setup_component(
         hass,
         LIGHT_DOMAIN,
@@ -143,11 +199,47 @@ async def test_state_reporting_all(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
+    # Initial state with no group member in the state machine -> unavailable
+    assert hass.states.get("light.light_group").state == STATE_UNAVAILABLE
+
+    # All group members unavailable -> unavailable
+    hass.states.async_set("light.test1", STATE_UNAVAILABLE)
+    hass.states.async_set("light.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNAVAILABLE
+
+    # At least one member unknown or unavailable -> group unknown
     hass.states.async_set("light.test1", STATE_ON)
     hass.states.async_set("light.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
     assert hass.states.get("light.light_group").state == STATE_UNKNOWN
 
+    hass.states.async_set("light.test1", STATE_ON)
+    hass.states.async_set("light.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("light.test1", STATE_UNKNOWN)
+    hass.states.async_set("light.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("light.test1", STATE_OFF)
+    hass.states.async_set("light.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("light.test1", STATE_OFF)
+    hass.states.async_set("light.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("binary_sensor.test1", STATE_UNKNOWN)
+    hass.states.async_set("binary_sensor.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("light.light_group").state == STATE_UNKNOWN
+
+    # At least one member off -> group off
     hass.states.async_set("light.test1", STATE_ON)
     hass.states.async_set("light.test2", STATE_OFF)
     await hass.async_block_till_done()
@@ -158,13 +250,15 @@ async def test_state_reporting_all(hass):
     await hass.async_block_till_done()
     assert hass.states.get("light.light_group").state == STATE_OFF
 
+    # Otherwise -> on
     hass.states.async_set("light.test1", STATE_ON)
     hass.states.async_set("light.test2", STATE_ON)
     await hass.async_block_till_done()
     assert hass.states.get("light.light_group").state == STATE_ON
 
-    hass.states.async_set("light.test1", STATE_UNAVAILABLE)
-    hass.states.async_set("light.test2", STATE_UNAVAILABLE)
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("light.test1")
+    hass.states.async_remove("light.test2")
     await hass.async_block_till_done()
     assert hass.states.get("light.light_group").state == STATE_UNAVAILABLE
 
diff --git a/tests/components/group/test_lock.py b/tests/components/group/test_lock.py
index 8db28fab18e..e76e47577c6 100644
--- a/tests/components/group/test_lock.py
+++ b/tests/components/group/test_lock.py
@@ -57,7 +57,16 @@ async def test_default_state(hass):
 
 
 async def test_state_reporting(hass):
-    """Test the state reporting."""
+    """Test the state reporting.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if at least one group member is unknown or unavailable.
+    Otherwise, the group state is jammed if at least one group member is jammed.
+    Otherwise, the group state is locking if at least one group member is locking.
+    Otherwise, the group state is unlocking if at least one group member is unlocking.
+    Otherwise, the group state is unlocked if at least one group member is unlocked.
+    Otherwise, the group state is locked.
+    """
     await async_setup_component(
         hass,
         LOCK_DOMAIN,
@@ -72,43 +81,98 @@ async def test_state_reporting(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
-    hass.states.async_set("lock.test1", STATE_LOCKED)
+    # Initial state with no group member in the state machine -> unavailable
+    assert hass.states.get("lock.lock_group").state == STATE_UNAVAILABLE
+
+    # All group members unavailable -> unavailable
+    hass.states.async_set("lock.test1", STATE_UNAVAILABLE)
     hass.states.async_set("lock.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
-    assert hass.states.get("lock.lock_group").state == STATE_UNKNOWN
+    assert hass.states.get("lock.lock_group").state == STATE_UNAVAILABLE
 
-    hass.states.async_set("lock.test1", STATE_LOCKED)
-    hass.states.async_set("lock.test2", STATE_UNLOCKED)
-    await hass.async_block_till_done()
-    assert hass.states.get("lock.lock_group").state == STATE_UNLOCKED
+    # At least one member unknown or unavailable -> group unknown
+    for state_1 in (
+        STATE_JAMMED,
+        STATE_LOCKED,
+        STATE_LOCKING,
+        STATE_UNKNOWN,
+        STATE_UNLOCKED,
+        STATE_UNLOCKING,
+    ):
+        hass.states.async_set("lock.test1", state_1)
+        hass.states.async_set("lock.test2", STATE_UNAVAILABLE)
+        await hass.async_block_till_done()
+        assert hass.states.get("lock.lock_group").state == STATE_UNKNOWN
 
+    for state_1 in (
+        STATE_JAMMED,
+        STATE_LOCKED,
+        STATE_LOCKING,
+        STATE_UNAVAILABLE,
+        STATE_UNKNOWN,
+        STATE_UNLOCKED,
+        STATE_UNLOCKING,
+    ):
+        hass.states.async_set("lock.test1", state_1)
+        hass.states.async_set("lock.test2", STATE_UNKNOWN)
+        await hass.async_block_till_done()
+        assert hass.states.get("lock.lock_group").state == STATE_UNKNOWN
+
+    # At least one member jammed -> group jammed
+    for state_1 in (
+        STATE_JAMMED,
+        STATE_LOCKED,
+        STATE_LOCKING,
+        STATE_UNLOCKED,
+        STATE_UNLOCKING,
+    ):
+        hass.states.async_set("lock.test1", state_1)
+        hass.states.async_set("lock.test2", STATE_JAMMED)
+        await hass.async_block_till_done()
+        assert hass.states.get("lock.lock_group").state == STATE_JAMMED
+
+    # At least one member locking -> group unlocking
+    for state_1 in (
+        STATE_LOCKED,
+        STATE_LOCKING,
+        STATE_UNLOCKED,
+        STATE_UNLOCKING,
+    ):
+        hass.states.async_set("lock.test1", state_1)
+        hass.states.async_set("lock.test2", STATE_LOCKING)
+        await hass.async_block_till_done()
+        assert hass.states.get("lock.lock_group").state == STATE_LOCKING
+
+    # At least one member unlocking -> group unlocking
+    for state_1 in (
+        STATE_LOCKED,
+        STATE_UNLOCKED,
+        STATE_UNLOCKING,
+    ):
+        hass.states.async_set("lock.test1", state_1)
+        hass.states.async_set("lock.test2", STATE_UNLOCKING)
+        await hass.async_block_till_done()
+        assert hass.states.get("lock.lock_group").state == STATE_UNLOCKING
+
+    # At least one member unlocked -> group unlocked
+    for state_1 in (
+        STATE_LOCKED,
+        STATE_UNLOCKED,
+    ):
+        hass.states.async_set("lock.test1", state_1)
+        hass.states.async_set("lock.test2", STATE_UNLOCKED)
+        await hass.async_block_till_done()
+        assert hass.states.get("lock.lock_group").state == STATE_UNLOCKED
+
+    # Otherwise -> locked
     hass.states.async_set("lock.test1", STATE_LOCKED)
     hass.states.async_set("lock.test2", STATE_LOCKED)
     await hass.async_block_till_done()
     assert hass.states.get("lock.lock_group").state == STATE_LOCKED
 
-    hass.states.async_set("lock.test1", STATE_UNLOCKED)
-    hass.states.async_set("lock.test2", STATE_UNLOCKED)
-    await hass.async_block_till_done()
-    assert hass.states.get("lock.lock_group").state == STATE_UNLOCKED
-
-    hass.states.async_set("lock.test1", STATE_UNLOCKED)
-    hass.states.async_set("lock.test2", STATE_JAMMED)
-    await hass.async_block_till_done()
-    assert hass.states.get("lock.lock_group").state == STATE_JAMMED
-
-    hass.states.async_set("lock.test1", STATE_LOCKED)
-    hass.states.async_set("lock.test2", STATE_UNLOCKING)
-    await hass.async_block_till_done()
-    assert hass.states.get("lock.lock_group").state == STATE_UNLOCKING
-
-    hass.states.async_set("lock.test1", STATE_UNLOCKED)
-    hass.states.async_set("lock.test2", STATE_LOCKING)
-    await hass.async_block_till_done()
-    assert hass.states.get("lock.lock_group").state == STATE_LOCKING
-
-    hass.states.async_set("lock.test1", STATE_UNAVAILABLE)
-    hass.states.async_set("lock.test2", STATE_UNAVAILABLE)
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("lock.test1")
+    hass.states.async_remove("lock.test2")
     await hass.async_block_till_done()
     assert hass.states.get("lock.lock_group").state == STATE_UNAVAILABLE
 
diff --git a/tests/components/group/test_media_player.py b/tests/components/group/test_media_player.py
index f741e2d1a84..85e75ffcba6 100644
--- a/tests/components/group/test_media_player.py
+++ b/tests/components/group/test_media_player.py
@@ -43,6 +43,8 @@ from homeassistant.const import (
     SERVICE_VOLUME_DOWN,
     SERVICE_VOLUME_MUTE,
     SERVICE_VOLUME_UP,
+    STATE_BUFFERING,
+    STATE_IDLE,
     STATE_OFF,
     STATE_ON,
     STATE_PAUSED,
@@ -99,7 +101,17 @@ async def test_default_state(hass):
 
 
 async def test_state_reporting(hass):
-    """Test the state reporting."""
+    """Test the state reporting.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if all group members are unknown.
+    Otherwise, the group state is buffering if all group members are buffering.
+    Otherwise, the group state is idle if all group members are idle.
+    Otherwise, the group state is paused if all group members are paused.
+    Otherwise, the group state is playing if all group members are playing.
+    Otherwise, the group state is on if at least one group member is not off, unavailable or unknown.
+    Otherwise, the group state is off.
+    """
     await async_setup_component(
         hass,
         MEDIA_DOMAIN,
@@ -114,27 +126,60 @@ async def test_state_reporting(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
+    # Initial state with no group member in the state machine -> unknown
     assert hass.states.get("media_player.media_group").state == STATE_UNKNOWN
 
-    hass.states.async_set("media_player.player_1", STATE_ON)
-    hass.states.async_set("media_player.player_2", STATE_UNAVAILABLE)
-    await hass.async_block_till_done()
-    assert hass.states.get("media_player.media_group").state == STATE_ON
+    # All group members buffering -> buffering
+    # All group members idle -> idle
+    # All group members paused -> paused
+    # All group members playing -> playing
+    # All group members unavailable -> unavailable
+    # All group members unknown -> unknown
+    for state in (
+        STATE_BUFFERING,
+        STATE_IDLE,
+        STATE_PAUSED,
+        STATE_PLAYING,
+        STATE_UNAVAILABLE,
+        STATE_UNKNOWN,
+    ):
+        hass.states.async_set("media_player.player_1", state)
+        hass.states.async_set("media_player.player_2", state)
+        await hass.async_block_till_done()
+        assert hass.states.get("media_player.media_group").state == state
 
-    hass.states.async_set("media_player.player_1", STATE_ON)
-    hass.states.async_set("media_player.player_2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("media_player.media_group").state == STATE_ON
+    # At least one member not off, unavailable or unknown -> on
+    for state_1 in (STATE_BUFFERING, STATE_IDLE, STATE_ON, STATE_PAUSED, STATE_PLAYING):
+        for state_2 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+            hass.states.async_set("media_player.player_1", state_1)
+            hass.states.async_set("media_player.player_2", state_2)
+            await hass.async_block_till_done()
+            assert hass.states.get("media_player.media_group").state == STATE_ON
 
-    hass.states.async_set("media_player.player_1", STATE_OFF)
-    hass.states.async_set("media_player.player_2", STATE_UNAVAILABLE)
-    await hass.async_block_till_done()
-    assert hass.states.get("media_player.media_group").state == STATE_OFF
+    for state_1 in (STATE_OFF, STATE_UNAVAILABLE, STATE_UNKNOWN):
+        hass.states.async_set("media_player.player_1", state_1)
+        hass.states.async_set("media_player.player_2", STATE_OFF)
+        await hass.async_block_till_done()
+        assert hass.states.get("media_player.media_group").state == STATE_OFF
 
-    hass.states.async_set("media_player.player_1", STATE_UNAVAILABLE)
-    hass.states.async_set("media_player.player_2", STATE_UNAVAILABLE)
+    # Otherwise off
+    for state_1 in (STATE_OFF, STATE_UNKNOWN):
+        hass.states.async_set("media_player.player_1", state_1)
+        hass.states.async_set("media_player.player_2", STATE_UNAVAILABLE)
+        await hass.async_block_till_done()
+        assert hass.states.get("media_player.media_group").state == STATE_OFF
+
+    for state_1 in (STATE_OFF, STATE_UNAVAILABLE):
+        hass.states.async_set("media_player.player_1", state_1)
+        hass.states.async_set("media_player.player_2", STATE_UNKNOWN)
+        await hass.async_block_till_done()
+        assert hass.states.get("media_player.media_group").state == STATE_OFF
+
+    # All group members removed from the state machine -> unknown
+    hass.states.async_remove("media_player.player_1")
+    hass.states.async_remove("media_player.player_2")
     await hass.async_block_till_done()
-    assert hass.states.get("media_player.media_group").state == STATE_UNAVAILABLE
+    assert hass.states.get("media_player.media_group").state == STATE_UNKNOWN
 
 
 async def test_supported_features(hass):
diff --git a/tests/components/group/test_switch.py b/tests/components/group/test_switch.py
index 5df2542d101..9a8da274a0a 100644
--- a/tests/components/group/test_switch.py
+++ b/tests/components/group/test_switch.py
@@ -56,7 +56,13 @@ async def test_default_state(hass):
 
 
 async def test_state_reporting(hass):
-    """Test the state reporting."""
+    """Test the state reporting in 'any' mode.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if all group members are unknown.
+    Otherwise, the group state is on if at least one group member is on.
+    Otherwise, the group state is off.
+    """
     await async_setup_component(
         hass,
         SWITCH_DOMAIN,
@@ -72,29 +78,79 @@ async def test_state_reporting(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
-    hass.states.async_set("switch.test1", STATE_ON)
-    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
-    await hass.async_block_till_done()
-    assert hass.states.get("switch.switch_group").state == STATE_ON
-
-    hass.states.async_set("switch.test1", STATE_ON)
-    hass.states.async_set("switch.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("switch.switch_group").state == STATE_ON
-
-    hass.states.async_set("switch.test1", STATE_OFF)
-    hass.states.async_set("switch.test2", STATE_OFF)
-    await hass.async_block_till_done()
-    assert hass.states.get("switch.switch_group").state == STATE_OFF
+    # Initial state with no group member in the state machine -> unavailable
+    assert hass.states.get("switch.switch_group").state == STATE_UNAVAILABLE
 
+    # All group members unavailable -> unavailable
     hass.states.async_set("switch.test1", STATE_UNAVAILABLE)
     hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
     assert hass.states.get("switch.switch_group").state == STATE_UNAVAILABLE
 
+    # All group members unknown -> unknown
+    hass.states.async_set("switch.test1", STATE_UNKNOWN)
+    hass.states.async_set("switch.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    # Group members unknown or unavailable -> unknown
+    hass.states.async_set("switch.test1", STATE_UNKNOWN)
+    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    # At least one member on -> group on
+    hass.states.async_set("switch.test1", STATE_ON)
+    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_ON
+
+    hass.states.async_set("switch.test1", STATE_ON)
+    hass.states.async_set("switch.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_ON
+
+    hass.states.async_set("switch.test1", STATE_ON)
+    hass.states.async_set("switch.test2", STATE_ON)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_ON
+
+    hass.states.async_set("switch.test1", STATE_ON)
+    hass.states.async_set("switch.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_ON
+
+    # Otherwise -> off
+    hass.states.async_set("switch.test1", STATE_OFF)
+    hass.states.async_set("switch.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_OFF
+
+    hass.states.async_set("switch.test1", STATE_UNKNOWN)
+    hass.states.async_set("switch.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_OFF
+
+    hass.states.async_set("switch.test1", STATE_UNAVAILABLE)
+    hass.states.async_set("switch.test2", STATE_OFF)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_OFF
+
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("switch.test1")
+    hass.states.async_remove("switch.test2")
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNAVAILABLE
+
 
 async def test_state_reporting_all(hass):
-    """Test the state reporting."""
+    """Test the state reporting in 'all' mode.
+
+    The group state is unavailable if all group members are unavailable.
+    Otherwise, the group state is unknown if at least one group member is unknown or unavailable.
+    Otherwise, the group state is off if at least one group member is off.
+    Otherwise, the group state is on.
+    """
     await async_setup_component(
         hass,
         SWITCH_DOMAIN,
@@ -110,11 +166,47 @@ async def test_state_reporting_all(hass):
     await hass.async_start()
     await hass.async_block_till_done()
 
+    # Initial state with no group member in the state machine -> unavailable
+    assert hass.states.get("switch.switch_group").state == STATE_UNAVAILABLE
+
+    # All group members unavailable -> unavailable
+    hass.states.async_set("switch.test1", STATE_UNAVAILABLE)
+    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNAVAILABLE
+
+    # At least one member unknown or unavailable -> group unknown
     hass.states.async_set("switch.test1", STATE_ON)
     hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
     await hass.async_block_till_done()
     assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
 
+    hass.states.async_set("switch.test1", STATE_ON)
+    hass.states.async_set("switch.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("switch.test1", STATE_UNKNOWN)
+    hass.states.async_set("switch.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("switch.test1", STATE_OFF)
+    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("switch.test1", STATE_OFF)
+    hass.states.async_set("switch.test2", STATE_UNKNOWN)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    hass.states.async_set("switch.test1", STATE_UNKNOWN)
+    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
+    await hass.async_block_till_done()
+    assert hass.states.get("switch.switch_group").state == STATE_UNKNOWN
+
+    # At least one member off -> group off
     hass.states.async_set("switch.test1", STATE_ON)
     hass.states.async_set("switch.test2", STATE_OFF)
     await hass.async_block_till_done()
@@ -125,13 +217,15 @@ async def test_state_reporting_all(hass):
     await hass.async_block_till_done()
     assert hass.states.get("switch.switch_group").state == STATE_OFF
 
+    # Otherwise -> on
     hass.states.async_set("switch.test1", STATE_ON)
     hass.states.async_set("switch.test2", STATE_ON)
     await hass.async_block_till_done()
     assert hass.states.get("switch.switch_group").state == STATE_ON
 
-    hass.states.async_set("switch.test1", STATE_UNAVAILABLE)
-    hass.states.async_set("switch.test2", STATE_UNAVAILABLE)
+    # All group members removed from the state machine -> unavailable
+    hass.states.async_remove("switch.test1")
+    hass.states.async_remove("switch.test2")
     await hass.async_block_till_done()
     assert hass.states.get("switch.switch_group").state == STATE_UNAVAILABLE