Fix unittests

Author: ekouts

unittests/test_cli.py

@@ -781,8 +781,8 @@ def test_maxfail_invalid_option(run_reframe):
     )
     assert 'Traceback' not in stdout
     assert 'Traceback' not in stderr
-    assert "--maxfail is not a valid integer: 'foo'" in stdout
-    assert returncode == 1
+    assert "--maxfail: invalid int value: 'foo'" in stderr
+    assert returncode == 2
 
 
 def test_maxfail_negative(run_reframe):
@@ -793,7 +793,7 @@ def test_maxfail_negative(run_reframe):
     )
     assert 'Traceback' not in stdout
     assert 'Traceback' not in stderr
-    assert "--maxfail should be a non-negative integer: '-2'" in stdout
+    assert "--maxfail should be a non-negative integer: -2" in stdout
     assert returncode == 1