Fixed diagnostics files uri handling, added low-level tests

test/solidlsp/python/test_python_diagnostics.py

@@ -0,0 +1,19 @@
+import os
+
+import pytest
+
+from solidlsp import SolidLanguageServer
+from test.conftest import PYTHON_LANGUAGE_BACKENDS
+from test.solidlsp.util.diagnostics import assert_file_diagnostics
+
+
+@pytest.mark.python
+class TestPythonDiagnostics:
+    @pytest.mark.parametrize("language_server", PYTHON_LANGUAGE_BACKENDS, indirect=True)
+    def test_file_diagnostics(self, language_server: SolidLanguageServer) -> None:
+        assert_file_diagnostics(
+            language_server,
+            os.path.join("test_repo", "diagnostics_sample.py"),
+            ("missing_user", "undefined_name"),
+            min_count=2,
+        )