Fix tests code style.

tests/test_command_line.py

@@ -121,6 +121,7 @@ def test_element() -> None:
 
 
 def test_unwrapped_element() -> None:
+    """Test `element` command from inside the project."""
     arguments: argparse.Namespace = parse_arguments(
         ["map_machine"] + COMMAND_LINES["element"]
     )

tests/test_completion.py

@@ -4,5 +4,4 @@ from map_machine.ui.completion import completion_commands
 
 def test_completion() -> None:
     """Test Fish shell completion generation."""
-    commands: str = completion_commands()
-    assert commands.startswith("set -l")
+    assert completion_commands().startswith("set -l")

tests/test_icons.py

@@ -54,8 +54,10 @@ def get_icon(tags: Tags) -> IconSet:
 
 def test_no_icons() -> None:
     """
-    Tags that has no description in scheme and should be visualized with default
-    shape.
+    Test icon creation for tags not described in the scheme.
+
+    Tags that has no description in the scheme and should be visualized with
+    default shape.
     """
     icon: IconSet = get_icon({"aaa": "bbb"})
     assert icon.main_icon.is_default()
@@ -64,6 +66,8 @@ def test_no_icons() -> None:
 
 def test_no_icons_but_color() -> None:
     """
+    Test icon creation for tags not described in the scheme and `colour` tag.
+
     Tags that has no description in scheme, but have `colour` tag and should be
     visualized with default shape with the given color.
     """