Make module purge unit test more robust

Author: hwikle-lanl

lib/pavilion/errors.py

@@ -322,3 +322,6 @@ class TestGroupError(PavilionError):
 
 class LockfileError(PavilionError):
     """Errors relating to lockfiles."""
+
+class SchedConfigError(PavilionError):
+    """Raised when there's a problem with the scheduler configuration."""

lib/pavilion/unittest.py

@@ -313,7 +313,7 @@ def _load_test(self, name: str, platform: str = 'this', host: str = 'this',
     del __config_lines
 
     def _quick_test(self, cfg=None, name="quick_test",
-                    build=True, finalize=True, purge=False):
+                    build=True, finalize=True, purge=True):
         """Create a test run object to work with.
         The default is a simple hello world test with the raw scheduler.
 

test/tests/mod_wrapper_tests.py

@@ -318,8 +318,14 @@ def test_module_purge(self):
         test_cfg['run']['cmds'] = [
             '[[ $(module -t list 2>&1) = "No modules loaded" ]] || exit 1',
         ]
+        test_cfg['run']['preamble'].append('module load test_mod1 || exit 2')
 
-        test = self._quick_test(test_cfg, purge=True)
+        test = self._quick_test(test_cfg, purge=False)
+        run_result = test.run()
+
+        self.assertEqual(run_result, 1)
+
+        test = self._quick_test(test_cfg)
         run_result = test.run()
 
         self.assertEqual(run_result, 0)