Add: Allow to load a config from a string

This new method is mostly for testing purposes to allow providing a
config via a string inside a test.

autohooks/config.py

@@ -134,6 +134,20 @@ def from_dict(config_dict: Dict[str, Any]) -> "AutohooksConfig":
             )
         return AutohooksConfig(settings=settings, config=config)
 
+    @staticmethod
+    def from_string(content: str) -> "AutohooksConfig":
+        """
+        Load an AutohooksConfig from a string
+
+        Args:
+            content: The content of the config
+
+        Returns:
+            A new AutohooksConfig
+        """
+        config_dict = tomlkit.loads(content)
+        return AutohooksConfig.from_dict(config_dict)
+
     @staticmethod
     def from_toml(toml_file: Path) -> "AutohooksConfig":
         """
@@ -145,8 +159,7 @@ def from_toml(toml_file: Path) -> "AutohooksConfig":
         Returns:
             A new AutohooksConfig
         """
-        config_dict = tomlkit.loads(toml_file.read_text())
-        return AutohooksConfig.from_dict(config_dict)
+        return AutohooksConfig.from_string(toml_file.read_text())
 
 
 def load_config_from_pyproject_toml(

tests/test_config.py

@@ -42,6 +42,27 @@ def test_load_from_non_existing_toml_file(self):
 
         self.assertEqual(len(config.get_pre_commit_script_names()), 0)
 
+    def test_load_from_string(self):
+        config = AutohooksConfig.from_string(
+            """
+            [tool.autohooks]
+            pre-commit = ["foo", "bar"]
+            """
+        )
+
+        self.assertTrue(config.has_autohooks_config())
+
+        self.assertListEqual(
+            config.get_pre_commit_script_names(), ["foo", "bar"]
+        )
+
+    def test_load_from_empty_string(self):
+        config = AutohooksConfig.from_string("")
+
+        self.assertFalse(config.has_autohooks_config())
+
+        self.assertEqual(config.get_pre_commit_script_names(), [])
+
     def test_empty_config(self):
         config = AutohooksConfig()