Improve cpp log level classification

test/solidlsp/cpp/test_clangd_logging.py

@@ -0,0 +1,43 @@
+import logging
+
+import pytest
+
+from solidlsp import SolidLanguageServer
+from solidlsp.language_servers.clangd_language_server import ClangdLanguageServer
+
+
+@pytest.mark.cpp
+class TestClangdLogging:
+    @pytest.mark.parametrize(
+        "expected, line",
+        [
+            # Parametrize names instead of codes for human-readable output in test logs.
+            (logging.getLevelName(logging.INFO), "I[12:00:00.000] clangd version 22.1.3"),
+            (logging.getLevelName(logging.INFO), "V[12:00:00.000] verbose detail"),
+            (logging.getLevelName(logging.DEBUG), "D[12:00:00.000] debug detail"),
+            (logging.getLevelName(logging.ERROR), "E[12:00:00.000] something bad"),
+            (logging.getLevelName(logging.ERROR), "F[12:00:00.000] fatal"),
+        ],
+    )
+    def test_log_record_detection(self, expected: str, line: str) -> None:
+        """
+        Verifies clangd's stderr log classifier maps each level prefix to the
+        expected Python logging level and avoids misclassifying compile-command
+        payloads as ERROR.
+        """
+        assert ClangdLanguageServer._determine_log_level(line) == logging.getLevelNamesMapping()[expected]
+
+    def test_log_record_info_payload_mentions_fno_exceptions(self) -> None:
+        line = """clang++ -fno-exceptions -c no_exceptions.cpp"""
+        # Basic classifier incorrectly detects line as an error log.
+        assert SolidLanguageServer._determine_log_level(line) == logging.ERROR
+        # Clangd classifier correctly detects line as an info log.
+        assert ClangdLanguageServer._determine_log_level(line) == logging.INFO
+
+    def test_log_record_info_payload_without_prefix(self) -> None:
+        # Multi-line records: first line carries the I[...] prefix, subsequent
+        # lines do not. Treat lack of prefix as continuation.
+        assert ClangdLanguageServer._determine_log_level("[/home/user/project/build]") == logging.INFO
+
+    def test_log_record_info_payload_empty(self) -> None:
+        assert ClangdLanguageServer._determine_log_level("") == logging.INFO