Add coverage comments and minor change

src/mkdocs_include_markdown_plugin/directive.py

@@ -203,7 +203,7 @@ def resolve_file_paths_to_include(
         ), False
 
     if process.is_relative_path(include_string):
-        if includer_page_src_path is None:
+        if includer_page_src_path is None:  # pragma: no cover
             raise PluginError(
                 'Relative paths are not allowed when the includer page'
                 ' source path is not provided. The include string'
@@ -248,7 +248,7 @@ def resolve_file_paths_to_exclude(
         return glob.glob(exclude_string, flags=GLOB_FLAGS)
 
     if process.is_relative_path(exclude_string):
-        if includer_page_src_path is None:
+        if includer_page_src_path is None:  # pragma: no cover
             raise PluginError(
                 'Relative paths are not allowed when the includer page'
                 ' source path is not provided. The exclude string'

src/mkdocs_include_markdown_plugin/event.py

@@ -64,7 +64,7 @@ def file_lineno_message(
         lineno: int,
 ) -> str:
     """Return a message with the file path and line number."""
-    if page_src_path is None:
+    if page_src_path is None:  # pragma: no cover
         return f'generated page content (line {lineno})'
     return (
         f'{os.path.relpath(page_src_path, docs_dir)}'
@@ -541,7 +541,7 @@ def found_include_markdown_tag(  # noqa: PLR0912, PLR0915
 
             # relative URLs rewriting
             if bool_options['rewrite-relative-urls'].value:
-                if page_src_path is None:
+                if page_src_path is None:  # pragma: no cover
                     logger.warning(
                         'Relative URLs rewriting is not supported in'
                         ' generated pages.',