Merge pull request #162 from dmtucker/issue161

Prevent AttributeError in pytest_terminal_summary

Author: dmtucker

src/pytest_mypy.py

@@ -327,17 +327,18 @@ class MypyWarning(pytest.PytestWarning):
 
 def pytest_terminal_summary(terminalreporter, config):
     """Report stderr and unrecognized lines from stdout."""
-    try:
-        with open(config._mypy_results_path, mode="r") as results_f:
-            results = MypyResults.load(results_f)
-    except FileNotFoundError:
-        # No MypyItems executed.
-        return
-    if results.unmatched_stdout or results.stderr:
-        terminalreporter.section("mypy")
-        if results.unmatched_stdout:
-            color = {"red": True} if results.status else {"green": True}
-            terminalreporter.write_line(results.unmatched_stdout, **color)
-        if results.stderr:
-            terminalreporter.write_line(results.stderr, yellow=True)
-    os.remove(config._mypy_results_path)
+    if _is_master(config):
+        try:
+            with open(config._mypy_results_path, mode="r") as results_f:
+                results = MypyResults.load(results_f)
+        except FileNotFoundError:
+            # No MypyItems executed.
+            return
+        if results.unmatched_stdout or results.stderr:
+            terminalreporter.section("mypy")
+            if results.unmatched_stdout:
+                color = {"red": True} if results.status else {"green": True}
+                terminalreporter.write_line(results.unmatched_stdout, **color)
+            if results.stderr:
+                terminalreporter.write_line(results.stderr, yellow=True)
+        os.remove(config._mypy_results_path)

tests/test_pytest_mypy.py

@@ -89,13 +89,15 @@ def pyfunc(x: int) -> str:
     )
     result = testdir.runpytest_subprocess(*xdist_args)
     result.assert_outcomes()
+    assert "_mypy_results_path" not in result.stderr.str()
     result = testdir.runpytest_subprocess("--mypy", *xdist_args)
     mypy_file_checks = 1
     mypy_status_check = 1
     mypy_checks = mypy_file_checks + mypy_status_check
     result.assert_outcomes(failed=mypy_checks)
     result.stdout.fnmatch_lines(["2: error: Incompatible return value*"])
     assert result.ret != 0
+    assert "_mypy_results_path" not in result.stderr.str()
 
 
 def test_mypy_annotation_unchecked(testdir, xdist_args):