Migrate tests to pytest (#23544)

* Migrate tests to pytest

* Fixup

* Use loop fixture in test_check_config

* Lint

tests/util/test_ruamel_yaml.py

@@ -1,6 +1,5 @@
 """Test Home Assistant ruamel.yaml loader."""
 import os
-import unittest
 from tempfile import mkdtemp
 import pytest
 
@@ -114,45 +113,51 @@ views:
     cards: !include cards.yaml
 """
 
+TMP_DIR = None
 
-class TestYAML(unittest.TestCase):
-    """Test lovelace.yaml save and load."""
 
-    def setUp(self):
-        """Set up for tests."""
-        self.tmp_dir = mkdtemp()
-        self.yaml = YAML(typ='rt')
+def setup():
+    """Set up for tests."""
+    global TMP_DIR
+    TMP_DIR = mkdtemp()
 
-    def tearDown(self):
-        """Clean up after tests."""
-        for fname in os.listdir(self.tmp_dir):
-            os.remove(os.path.join(self.tmp_dir, fname))
-        os.rmdir(self.tmp_dir)
 
-    def _path_for(self, leaf_name):
-        return os.path.join(self.tmp_dir, leaf_name+".yaml")
+def teardown():
+    """Clean up after tests."""
+    for fname in os.listdir(TMP_DIR):
+        os.remove(os.path.join(TMP_DIR, fname))
+    os.rmdir(TMP_DIR)
 
-    def test_save_and_load(self):
-        """Test saving and loading back."""
-        fname = self._path_for("test1")
-        open(fname, "w+").close()
-        util_yaml.save_yaml(fname, self.yaml.load(TEST_YAML_A))
-        data = util_yaml.load_yaml(fname, True)
-        assert data == self.yaml.load(TEST_YAML_A)
 
-    def test_overwrite_and_reload(self):
-        """Test that we can overwrite an existing file and read back."""
-        fname = self._path_for("test2")
-        open(fname, "w+").close()
-        util_yaml.save_yaml(fname, self.yaml.load(TEST_YAML_A))
-        util_yaml.save_yaml(fname, self.yaml.load(TEST_YAML_B))
-        data = util_yaml.load_yaml(fname, True)
-        assert data == self.yaml.load(TEST_YAML_B)
+def _path_for(leaf_name):
+    return os.path.join(TMP_DIR, leaf_name+".yaml")
 
-    def test_load_bad_data(self):
-        """Test error from trying to load unserialisable data."""
-        fname = self._path_for("test3")
-        with open(fname, "w") as fh:
-            fh.write(TEST_BAD_YAML)
-        with pytest.raises(HomeAssistantError):
-            util_yaml.load_yaml(fname, True)
+
+def test_save_and_load():
+    """Test saving and loading back."""
+    yaml = YAML(typ='rt')
+    fname = _path_for("test1")
+    open(fname, "w+").close()
+    util_yaml.save_yaml(fname, yaml.load(TEST_YAML_A))
+    data = util_yaml.load_yaml(fname, True)
+    assert data == yaml.load(TEST_YAML_A)
+
+
+def test_overwrite_and_reload():
+    """Test that we can overwrite an existing file and read back."""
+    yaml = YAML(typ='rt')
+    fname = _path_for("test2")
+    open(fname, "w+").close()
+    util_yaml.save_yaml(fname, yaml.load(TEST_YAML_A))
+    util_yaml.save_yaml(fname, yaml.load(TEST_YAML_B))
+    data = util_yaml.load_yaml(fname, True)
+    assert data == yaml.load(TEST_YAML_B)
+
+
+def test_load_bad_data():
+    """Test error from trying to load unserialisable data."""
+    fname = _path_for("test3")
+    with open(fname, "w") as fh:
+        fh.write(TEST_BAD_YAML)
+    with pytest.raises(HomeAssistantError):
+        util_yaml.load_yaml(fname, True)