For some reason (may be because we now always run tests in a subprocess), test_concurrent_fixture started to fail. Running pytest in a subprocess fixes some issues with capturing test stdout.

Alexander Artemenko · kevlened · commit 02212e156ba7 · 2020-04-30T12:32:55.000-04:00
diff --git a/tests/test_concurrent.py b/tests/test_concurrent.py
@@ -23,7 +23,7 @@ def test_0(driver):
         def test_1(driver):
             print_('inside test_1')
     """)
-    result = testdir.runpytest(
+    result = testdir.runpytest_subprocess(
       '-s',
       '--tests-per-worker=2'
     )

Original file line number	Diff line number	Diff line change
`@@ -23,7 +23,7 @@ def test_0(driver):`
`23`	`23`	`def test_1(driver):`
`24`	`24`	`print_('inside test_1')`
`25`	`25`	`""")`
`26`		`- result = testdir.runpytest(`
	`26`	`+ result = testdir.runpytest_subprocess(`
`27`	`27`	`'-s',`
`28`	`28`	`'--tests-per-worker=2'`
`29`	`29`	`)`