Add test_name_formatter

Author: dmtucker

src/pytest_mypy/__init__.py

@@ -57,6 +57,14 @@ def serialized(self) -> str:
 terminal_summary_title = "mypy"
 
 
+def default_test_name_formatter(*, item: MypyFileItem) -> str:
+    path = item.path.relative_to(item.config.invocation_params.dir)
+    return f"[{terminal_summary_title}] {path}"
+
+
+test_name_formatter = default_test_name_formatter
+
+
 def default_file_error_formatter(
     item: MypyItem,
     results: MypyResults,
@@ -268,13 +276,9 @@ def runtest(self) -> None:
                 )
             )
 
-    def reportinfo(self) -> Tuple[str, None, str]:
+    def reportinfo(self) -> Tuple[Path, None, str]:
         """Produce a heading for the test report."""
-        return (
-            str(self.path),
-            None,
-            str(self.path.relative_to(self.config.invocation_params.dir)),
-        )
+        return (self.path, None, test_name_formatter(item=self))
 
 
 class MypyStatusItem(MypyItem):

tests/test_pytest_mypy.py

@@ -342,6 +342,29 @@ def pytest_configure(config):
     assert result.ret == pytest.ExitCode.OK
 
 
+def test_api_test_name_formatter(testdir, xdist_args):
+    """Ensure that the test_name_formatter can be replaced in a conftest.py."""
+    test_name = "UnmistakableTestName"
+    testdir.makepyfile(
+        conftest=f"""
+            cause_a_mypy_error: str = 5
+
+            def custom_test_name_formatter(item):
+                return "{test_name}"
+
+            def pytest_configure(config):
+                plugin = config.pluginmanager.getplugin('mypy')
+                plugin.test_name_formatter = custom_test_name_formatter
+        """,
+    )
+    result = testdir.runpytest_subprocess("--mypy", *xdist_args)
+    result.stdout.fnmatch_lines([f"*{test_name}*"])
+    mypy_file_check = 1
+    mypy_status_check = 1
+    result.assert_outcomes(failed=mypy_file_check + mypy_status_check)
+    assert result.ret == pytest.ExitCode.TESTS_FAILED
+
+
 @pytest.mark.xfail(
     Version("0.971") <= MYPY_VERSION,
     raises=AssertionError,