add tests for modules option in config.yaml

test/resources/config_legacy_modules.yaml

@@ -0,0 +1,3 @@
+modules:
+  - module_1
+  - module_2

test/resources/config_modules.yaml

@@ -0,0 +1,7 @@
+modules: 
+  use:
+    - path/to/module/dir/1
+    - path/to/module/dir/2
+  load:
+    - module_1
+    - module_2

test/test_payu.py

@@ -125,7 +125,7 @@ def test_movetree():
 
 
 def test_read_config():
-    config_path = os.path.join('test', 'config_mom5.yaml')
+    config_path = os.path.join('test', 'resources', 'config_mom5.yaml')
     config = payu.fsops.read_config(config_path)
 
     # Test control_path is not set in read_config
@@ -151,17 +151,28 @@ def test_read_config():
     assert(config.pop('modules') == {})
     assert(config == {})
 
-    # Test transform legacy modules option 
-    with open(config_tmp, 'w') as f:
-        f.write('modules:\n   - test_user_defined_module')
+    os.remove(config_tmp)
+
+def test_read_config_modules_legacy_option():
+    # Test transform legacy modules option
+    config_path = os.path.join('test', 'resources', 'config_legacy_modules.yaml')
 
-    config = payu.fsops.read_config(config_tmp)
+    config = payu.fsops.read_config(config_path)
     modules_config = config.get('modules', {})
-    
-    assert(modules_config.get('load', []) == ['test_user_defined_module'])
+
+    assert(modules_config.get('load', []) == ['module_1', 'module_2'])
     assert(modules_config.get('use', []) == [])
 
-    os.remove(config_tmp)
+
+def test_read_config_modules_option():
+    # Test modules with load/use options is unchanged 
+    config_path = os.path.join('test', 'resources', 'config_modules.yaml')
+
+    config = payu.fsops.read_config(config_path)
+    modules_config = config.get('modules', {})
+
+    assert(modules_config.get('load', []) == ['module_1', 'module_2'])
+    assert(modules_config.get('use', []) == ['path/to/module/dir/1', 'path/to/module/dir/2'])
 
 
 def test_make_symlink():