diff --git a/tests/unit/parsec/test_rose_utils.py b/tests/unit/parsec/test_rose_utils.py
index 3dae9d1894e..799fb9cecbf 100644
--- a/tests/unit/parsec/test_rose_utils.py
+++ b/tests/unit/parsec/test_rose_utils.py
@@ -15,14 +15,17 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
+import pytest
 
-from cylc.flow.parsec.rose_utils import get_rose_vars
+from types import SimpleNamespace
 
+from cylc.flow.parsec.rose_utils import get_rose_vars
 
-def test_get_rosedirs(tmp_path):
-    """Function returns dict of [jinja2:suite.rc] items
 
-    Also check that function does _not_ return [env] section items.
+@pytest.fixture
+def rose_config_jinja2(tmp_path, scope='module'):
+    """Fixture which returns a tmp_path containing setup ``rose-suite.conf``
+    files.
 
     Creates:
     .
@@ -31,13 +34,6 @@ def test_get_rosedirs(tmp_path):
         `-- opt
             |-- rose-suite-gravy.conf
             `-- rose-suite-chips.conf
-
-    Scenarios tested:
-        - Read in a basic rose-suite.conf file. Ensure we don't return env,
-          just jinja2.
-        - Get optional config name from an environment variable.
-        - Get optional config name from command line option.
-        - Get optional config name from an explicit over-ride string.
     """
     with open(tmp_path / 'rose-suite.conf', 'w+') as testfh:
         # The [env] section is there to make sure I don't load it with
@@ -46,8 +42,8 @@ def test_get_rosedirs(tmp_path):
             "[env]\n"
             "TIMS_ENV_VAR=Jelly\n"
             "[jinja2:suite.rc]\n"
-            "TIMS_JINJA2_ENV=64\n"
-            "Another_Jinja2_var=IceCream\n"
+            "JINJA2_VAR=64\n"
+            "Another_Jinja2_var=Defined in config\n"
         )
 
     opt_dir = tmp_path / 'opt'
@@ -55,38 +51,57 @@ def test_get_rosedirs(tmp_path):
     with open(opt_dir / 'rose-suite-gravy.conf', 'w+') as testfh:
         testfh.write(
             "[jinja2:suite.rc]\n"
-            "TIMS_JINJA2_ENV=42\n"
-            "Another_Jinja2_var=Peas\n"
+            "JINJA2_VAR=42\n"
+            "Another_Jinja2_var=Optional config picked from env var\n"
         )
 
     with open(opt_dir / 'rose-suite-chips.conf', 'w+') as testfh:
         testfh.write(
             "[jinja2:suite.rc]\n"
-            "TIMS_JINJA2_ENV=99\n"
-            "Another_Jinja2_var=Chips\n"
+            "JINJA2_VAR=99\n"
+            "Another_Jinja2_var=Optional config picked from CLI\n"
         )
+    return tmp_path
 
-    assert get_rose_vars(tmp_path) == {
-        'Another_Jinja2_var': 'IceCream',
-        'TIMS_JINJA2_ENV': '64'
-    }
 
-    os.environ['ROSE_SUITE_OPT_CONF_KEYS'] = "gravy"
-    assert get_rose_vars(tmp_path) == {
-        'Another_Jinja2_var': 'Peas',
-        'TIMS_JINJA2_ENV': '42'
-    }
+@pytest.mark.parametrize(
+    'override, exp_ANOTHER_JINJA2_ENV, exp_JINJA2_VAR',
+    [
+        (None, 'Defined in config', '64'),
+        ('environment', 'Optional config picked from env var', '42'),
+        ('CLI', 'Optional config picked from CLI', '99'),
+        ('override', 'Variable overridden', '99')
+    ]
+)
+def test_get_jinja2_basic(
+    rose_config_jinja2,
+    override,
+    exp_ANOTHER_JINJA2_ENV,
+    exp_JINJA2_VAR
+):
+    """Function returns dict of [jinja2:suite.rc] items
 
-    from types import SimpleNamespace
-    options = SimpleNamespace()
-    options.opt_conf_keys = ["chips"]
-    assert get_rose_vars(tmp_path, options) == {
-        'Another_Jinja2_var': 'Chips',
-        'TIMS_JINJA2_ENV': '99'
-    }
+    Scenarios tested:
+        - Read in a basic rose-suite.conf file. Ensure we don't return env,
+          just jinja2.
+        - Get optional config name from an environment variable.
+        - Get optional config name from command line option.
+        - Get optional config name from an explicit over-ride string.
+    """
+    options = None
+    if override == 'environment':
+        os.environ['ROSE_SUITE_OPT_CONF_KEYS'] = "gravy"
+    elif override == 'CLI':
+        options = SimpleNamespace()
+        options.opt_conf_keys = ["chips"]
+    elif override == 'override':
+        options = SimpleNamespace()
+        options.opt_conf_keys = ["chips"]
+        options.defines = [
+            "[jinja2:suite.rc]Another_Jinja2_var=Variable overridden"
+        ]
 
-    options.defines = ["[jinja2:suite.rc]TIMS_JINJA2_ENV=Curry_Sauce"]
-    assert get_rose_vars(tmp_path, options) == {
-        'Another_Jinja2_var': 'Chips',
-        'TIMS_JINJA2_ENV': 'Curry_Sauce'
+    assert get_rose_vars(rose_config_jinja2, options) == {
+        'Another_Jinja2_var': f'{exp_ANOTHER_JINJA2_ENV}',
+        'JINJA2_VAR': f'{exp_JINJA2_VAR}'
     }