add printing in error case

Signed-off-by: Grzegorz Bokota <[email protected]>

src/pytest_pystack/_monitor_process.py

@@ -53,7 +53,9 @@ def _run_monitor(config: PystackConfig, pid, queue):
         handled_test_cases.add(testcase)
 
         try:
-            if queue.get(timeout=config.threshold) != testcase:
+            new_testcase = queue.get(timeout=config.threshold)
+            if new_testcase != testcase:
+                print(f"new test {new_testcase} should not start before previous {testcase} test finished", file=sys.__stderr__)
                 raise Exception(
                     "new test should not start before previous test finished"
                 )

tests/test_pytest_pystack.py

@@ -5,9 +5,6 @@
 import pytest
 
 
-pytest_plugins = 'pytester'
-
-
 SLEEPING_TEST_TEMPLATE = """
 import time
 def test_sleeping_test():
@@ -309,11 +306,13 @@ def test_two_slow_tests_in_a_suite_prints_both(testdir, monkeypatch, capfd):
     assert "PYSTACK  -- test_sleeping_test2" in stderr
 
 
-def test_pytester_compat(pytester, capfd):
+def test_pytester_compat(testdir, capfd, monkeypatch):
     """Make sure that our make_napari_viewer plugin works."""
 
     # create a temporary pytest test file
-    pytester.makepyfile(
+
+    monkeypatch.chdir(testdir.tmpdir)
+    testdir.makepyfile(
     """
 pytest_plugins = 'pytester'
 
@@ -322,7 +321,7 @@ def test_pytester_compat(pytester, capfd):
 
 
 def test_sleep():
-    time.sleep(3)
+    time.sleep(1)
     assert 1 == 1
 '''
 
@@ -333,7 +332,7 @@ def test_pytester(pytester):
     result.assert_outcomes(passed=1)
     """
     )
-    result = pytester.runpytest("--pystack-threshold=1", "-s")
+    result = testdir.runpytest("--pystack-threshold=3", "-s")
 
     # check that all 1 test passed
     result.assert_outcomes(passed=1)