test: assert logging output

Author: jslee02

python/tests/unit/common/test_logging.py

@@ -2,18 +2,35 @@
 import pytest
 
 
-def test_basics():
+def assert_logged(capsys, expected):
+    captured = capsys.readouterr()
+    assert expected in captured.out or expected in captured.err
+
+
+def test_basics(capsys):
     dart.common.trace("trace log")
+    assert_logged(capsys, "trace log")
+
     dart.common.debug("debug log")
+    assert_logged(capsys, "debug log")
+
     dart.common.info("info log")
+    assert_logged(capsys, "info log")
+
     dart.common.warn("warn log")
+    assert_logged(capsys, "warn log")
+
     dart.common.error("error log")
+    assert_logged(capsys, "error log")
+
     dart.common.fatal("fatal log")
+    assert_logged(capsys, "fatal log")
 
 
-def test_arguments():
+def test_arguments(capsys):
     val = 10
     dart.common.info("Log with param '{}' and '{}'".format(1, val))
+    assert_logged(capsys, "Log with param '1' and '10'")
 
 
 if __name__ == "__main__":