test: add a test that self.stdout() works the way it says.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/test_testing.py b/tests/test_testing.py
index eae18890..37130074 100644
--- a/tests/test_testing.py
+++ b/tests/test_testing.py
@@ -203,6 +203,15 @@ class CoverageTestTest(CoverageTest):
         assert "StdOut\n" in out
         assert "StdErr\n" in out
 
+    def test_stdout(self):
+        # stdout is captured.
+        print("This is stdout")
+        print("Line 2")
+        assert self.stdout() == "This is stdout\nLine 2\n"
+        # When we grab stdout(), it's reset.
+        print("Some more")
+        assert self.stdout() == "Some more\n"
+
 
 class CheckUniqueFilenamesTest(CoverageTest):
     """Tests of CheckUniqueFilenames."""