Refactor test cases for improved readability and consistency

- Adjusted function signatures in various test files to enhance clarity by aligning parameters.
- Updated patching syntax for better readability across test cases.
- Improved formatting and spacing in test assertions and mock setups.
- Ensured consistent use of async/await patterns in async test functions.
- Enhanced comments for better understanding of test intentions.

app/schemas/player.py

@@ -30,17 +30,21 @@ class PlayerStateResponse(BaseModel):
 
     status: str = Field(description="Player status (playing, paused, stopped)")
     current_sound: dict[str, Any] | None = Field(
-        None, description="Current sound information",
+        None,
+        description="Current sound information",
     )
     playlist: dict[str, Any] | None = Field(
-        None, description="Current playlist information",
+        None,
+        description="Current playlist information",
     )
     position: int = Field(description="Current position in milliseconds")
     duration: int | None = Field(
-        None, description="Total duration in milliseconds",
+        None,
+        description="Total duration in milliseconds",
     )
     volume: int = Field(description="Current volume (0-100)")
     mode: str = Field(description="Current playback mode")
     index: int | None = Field(
-        None, description="Current track index in playlist",
+        None,
+        description="Current track index in playlist",
     )