Fixed diagnostics files uri handling, added low-level tests

test/solidlsp/java/test_java_diagnostics.py

@@ -0,0 +1,17 @@
+import pytest
+
+from solidlsp import SolidLanguageServer
+from solidlsp.ls_config import Language
+from test.solidlsp.util.diagnostics import assert_file_diagnostics
+
+
+@pytest.mark.java
+class TestJavaDiagnostics:
+    @pytest.mark.parametrize("language_server", [Language.JAVA], indirect=True)
+    def test_file_diagnostics(self, language_server: SolidLanguageServer) -> None:
+        assert_file_diagnostics(
+            language_server,
+            "src/main/java/test_repo/DiagnosticsSample.java",
+            (),
+            min_count=1,
+        )