diff --git a/tests/test_meta_invoice.py b/tests/test_meta_invoice.py
index 5586e75b4f78d521fb2d715ab5fdb2300664a75c..fcaa6ce8845844e2c4051f5dff0fb8f0ca5f0e0b 100644
--- a/tests/test_meta_invoice.py
+++ b/tests/test_meta_invoice.py
@@ -20,18 +20,6 @@ from . import testutil
 
 from conservancy_beancount.plugin import meta_invoice
 
-VALID_VALUES = {
-    'Invoices/304321.pdf',
-    'rt:123/456',
-    'rt://ticket/234',
-}
-
-INVALID_VALUES = {
-    '',
-    ' ',
-    '     ',
-}
-
 REQUIRED_ACCOUNTS = {
     'Accrued:AccountsPayable',
     'Accrued:AccountsReceivable',
@@ -55,7 +43,7 @@ def hook():
 @pytest.mark.parametrize('acct1,acct2,value', testutil.combine_values(
     REQUIRED_ACCOUNTS,
     NON_REQUIRED_ACCOUNTS,
-    VALID_VALUES,
+    testutil.LINK_METADATA_STRINGS,
 ))
 def test_valid_values_on_postings(hook, acct1, acct2, value):
     txn = testutil.Transaction(postings=[
@@ -67,7 +55,7 @@ def test_valid_values_on_postings(hook, acct1, acct2, value):
 @pytest.mark.parametrize('acct1,acct2,value', testutil.combine_values(
     REQUIRED_ACCOUNTS,
     NON_REQUIRED_ACCOUNTS,
-    INVALID_VALUES,
+    testutil.NON_LINK_METADATA_STRINGS,
 ))
 def test_invalid_values_on_postings(hook, acct1, acct2, value):
     txn = testutil.Transaction(postings=[
@@ -98,7 +86,7 @@ def test_bad_type_values_on_postings(hook, acct1, acct2, value):
 @pytest.mark.parametrize('acct1,acct2,value', testutil.combine_values(
     REQUIRED_ACCOUNTS,
     NON_REQUIRED_ACCOUNTS,
-    VALID_VALUES,
+    testutil.LINK_METADATA_STRINGS,
 ))
 def test_valid_values_on_transaction(hook, acct1, acct2, value):
     txn = testutil.Transaction(**{TEST_KEY: value}, postings=[
@@ -110,7 +98,7 @@ def test_valid_values_on_transaction(hook, acct1, acct2, value):
 @pytest.mark.parametrize('acct1,acct2,value', testutil.combine_values(
     REQUIRED_ACCOUNTS,
     NON_REQUIRED_ACCOUNTS,
-    INVALID_VALUES,
+    testutil.NON_LINK_METADATA_STRINGS,
 ))
 def test_invalid_values_on_transaction(hook, acct1, acct2, value):
     txn = testutil.Transaction(**{TEST_KEY: value}, postings=[