ci: add strict-no-cover to detect unnecessary coverage pragmas (#1897)

tests/issues/test_1027_win_unreachable_cleanup.py

@@ -102,7 +102,7 @@ async def test_lifespan_cleanup_executed():
 
         # Give server a moment to complete cleanup
         with anyio.move_on_after(5.0):
-            while not Path(cleanup_marker).exists():  # pragma: no cover
+            while not Path(cleanup_marker).exists():  # pragma: lax no cover
                 await anyio.sleep(0.1)
 
         # Verify cleanup marker was created - this works now that stdio_client
@@ -113,9 +113,9 @@ async def test_lifespan_cleanup_executed():
     finally:
         # Clean up files
         for path in [server_script, startup_marker, cleanup_marker]:
-            try:  # pragma: no cover
+            try:  # pragma: lax no cover
                 Path(path).unlink()
-            except FileNotFoundError:  # pragma: no cover
+            except FileNotFoundError:  # pragma: lax no cover
                 pass
 
 
@@ -204,7 +204,7 @@ async def test_stdin_close_triggers_cleanup():
                 await anyio.sleep(0.1)
 
         # Check if process is still running
-        if hasattr(process, "returncode") and process.returncode is not None:  # pragma: no cover
+        if hasattr(process, "returncode") and process.returncode is not None:  # pragma: lax no cover
             pytest.fail(f"Server process exited with code {process.returncode}")
 
         assert Path(startup_marker).exists(), "Server startup marker not created"
@@ -217,14 +217,14 @@ async def test_stdin_close_triggers_cleanup():
         try:
             with anyio.fail_after(5.0):  # Increased from 2.0 to 5.0
                 await process.wait()
-        except TimeoutError:  # pragma: no cover
+        except TimeoutError:  # pragma: lax no cover
             # If it doesn't exit after stdin close, terminate it
             process.terminate()
             await process.wait()
 
         # Check if cleanup ran
         with anyio.move_on_after(5.0):
-            while not Path(cleanup_marker).exists():  # pragma: no cover
+            while not Path(cleanup_marker).exists():  # pragma: lax no cover
                 await anyio.sleep(0.1)
 
         # Verify the cleanup ran - stdin closure enables graceful shutdown
@@ -234,7 +234,7 @@ async def test_stdin_close_triggers_cleanup():
     finally:
         # Clean up files
         for path in [server_script, startup_marker, cleanup_marker]:
-            try:  # pragma: no cover
+            try:  # pragma: lax no cover
                 Path(path).unlink()
-            except FileNotFoundError:  # pragma: no cover
+            except FileNotFoundError:  # pragma: lax no cover
                 pass

tests/issues/test_129_resource_templates.py

@@ -33,10 +33,10 @@ async def test_resource_templates():
     assert len(templates) == 2
 
     # Verify template details
-    greeting_template = next(t for t in templates if t.name == "get_greeting")  # pragma: no cover
+    greeting_template = next(t for t in templates if t.name == "get_greeting")
     assert greeting_template.uri_template == "greeting://{name}"
     assert greeting_template.description == "Get a personalized greeting"
 
-    profile_template = next(t for t in templates if t.name == "get_user_profile")  # pragma: no cover
+    profile_template = next(t for t in templates if t.name == "get_user_profile")
     assert profile_template.uri_template == "users://{user_id}/profile"
     assert profile_template.description == "Dynamic user data"

tests/issues/test_1363_race_condition_streamable_http.py

@@ -99,7 +99,7 @@ def check_logs_for_race_condition_errors(caplog: pytest.LogCaptureFixture, test_
     # Check for specific race condition errors in logs
     errors_found: list[str] = []
 
-    for record in caplog.records:  # pragma: no cover
+    for record in caplog.records:  # pragma: lax no cover
         message = record.getMessage()
         if "ClosedResourceError" in message:
             errors_found.append("ClosedResourceError")

tests/issues/test_88_random_error.py

@@ -104,7 +104,7 @@ async def test_notification_validation_error(tmp_path: Path):
             # proving server is still responsive
             result = await session.call_tool("fast", read_timeout_seconds=None)
             assert result.content == [TextContent(type="text", text="fast 3")]
-        scope.cancel()  # pragma: no cover
+        scope.cancel()  # pragma: lax no cover
 
     # Run server and client in separate task groups to avoid cancellation
     server_writer, server_reader = anyio.create_memory_object_stream[SessionMessage](1)

tests/issues/test_malformed_input.py

@@ -82,7 +82,7 @@ async def test_malformed_initialize_request_does_not_crash_server():
 
             except anyio.WouldBlock:  # pragma: no cover
                 pytest.fail("No response received - server likely crashed")
-    finally:  # pragma: no cover
+    finally:  # pragma: lax no cover
         # Close all streams to ensure proper cleanup
         await read_send_stream.aclose()
         await write_send_stream.aclose()
@@ -143,7 +143,7 @@ async def test_multiple_concurrent_malformed_requests():
                 assert isinstance(response, JSONRPCError)
                 assert response.id == f"malformed_{i}"
                 assert response.error.code == INVALID_PARAMS
-    finally:  # pragma: no cover
+    finally:  # pragma: lax no cover
         # Close all streams to ensure proper cleanup
         await read_send_stream.aclose()
         await write_send_stream.aclose()