diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ff24e3900..89247cbba 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,8 +29,8 @@ on:
       cylc_rose_repo:
         description: The cylc-rose repo to test against
         required: false
-  schedule:
-  - cron: '37 04 * * 1-5' # 03:37, Monday-Friday
+  # schedule:
+  # - cron: '37 04 * * 1-5' # 04:37, Monday-Friday
 
 defaults:
   run:
@@ -82,9 +82,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu-22.04']
-        python-version: ['3.7', '3.8', '3.9']
+        os: ['ubuntu-latest']
+        python-version: ['3.8', '3.9', '3.x']
         include:
+          - os: ubuntu-22.04
+            python-version: '3.7'
           - os: 'macos-latest'
             python-version: '3.8'
 
diff --git a/t/rose-metadata-check/09-custom-macro.t b/t/rose-metadata-check/09-custom-macro.t
index 417bb1a72..4be25d8fc 100755
--- a/t/rose-metadata-check/09-custom-macro.t
+++ b/t/rose-metadata-check/09-custom-macro.t
@@ -19,9 +19,9 @@
 #-------------------------------------------------------------------------------
 # Test "rose metadata-check".
 #-------------------------------------------------------------------------------
-. $(dirname $0)/test_header
+. "$(dirname "$0")/test_header"
 #-------------------------------------------------------------------------------
-tests 18
+tests 20
 #-------------------------------------------------------------------------------
 # Check macro reference checking.
 TEST_KEY=$TEST_KEY_BASE-import-simple-ok
@@ -30,7 +30,7 @@ init <<__META_CONFIG__
 [namelist:macro_nl=my_macro_var1]
 macro=envswitch.LogicalTransformer
 __META_CONFIG__
-init_macro envswitch.py < $TEST_SOURCE_DIR/lib/custom_macro.py
+init_macro envswitch.py < "${TEST_SOURCE_DIR}/lib/custom_macro.py"
 run_pass "$TEST_KEY" rose metadata-check -C ../config
 file_cmp "$TEST_KEY.out" "$TEST_KEY.out" </dev/null
 file_cmp "$TEST_KEY.err" "$TEST_KEY.err" </dev/null
@@ -115,14 +115,12 @@ init <<__META_CONFIG__
 [namelist:macro_nl=my_macro_var1]
 macro=envswitch.LogicalTransformer
 __META_CONFIG__
-init_macro envswitch.py < $TEST_SOURCE_DIR/lib/custom_macro_corrupt.py
+init_macro envswitch.py < "${TEST_SOURCE_DIR}/lib/custom_macro_corrupt.py"
 run_fail "$TEST_KEY" rose metadata-check -C ../config
 file_cmp "$TEST_KEY.out" "$TEST_KEY.out" </dev/null
-file_cmp "$TEST_KEY.err" "$TEST_KEY.err" <<'__ERROR__'
-[V] rose.metadata_check.MetadataChecker: issues: 1
-    namelist:macro_nl=my_macro_var1=macro=envswitch.LogicalTransformer
-        Could not import envswitch.LogicalTransformer: IndentationError: expected an indented block (envswitch.py, line 33)
-__ERROR__
+file_grep "$TEST_KEY.err-1" '.*rose.metadata_check.MetadataChecker: issues: 1' "$TEST_KEY.err"
+file_grep "$TEST_KEY.err-2" 'namelist:macro_nl=my_macro_var1=macro=envswitch.LogicalTransformer' "$TEST_KEY.err"
+file_grep "$TEST_KEY.err-3" "Could not import envswitch.LogicalTransformer: IndentationError: expected an indented block.*(envswitch.py, line 33)" "$TEST_KEY.err"
 teardown
 #-------------------------------------------------------------------------------
 exit