diff --git a/sfdx-source/apex-common/test/classes/fflib_SObjectUnitOfWorkTest.cls b/sfdx-source/apex-common/test/classes/fflib_SObjectUnitOfWorkTest.cls
index 582e759bc3..63a05949e8 100644
--- a/sfdx-source/apex-common/test/classes/fflib_SObjectUnitOfWorkTest.cls
+++ b/sfdx-source/apex-common/test/classes/fflib_SObjectUnitOfWorkTest.cls
@@ -336,7 +336,7 @@ private with sharing class fflib_SObjectUnitOfWorkTest
 
         // Assert Results
         System.assertEquals(didFail, true, 'didFail');
-        System.assert(caughtEx.getMessage().contains('REQUIRED_FIELD_MISSING'), String.format('Exception message was ', new List<String> { caughtEx.getMessage() }));
+        System.assert(caughtEx.getMessage().contains('REQUIRED_FIELD_MISSING'), String.format('Exception message was {0}', new List<String> { caughtEx.getMessage() }));
 
         assertEvents(new List<String> {
                 'onCommitWorkStarting'
@@ -387,7 +387,7 @@ private with sharing class fflib_SObjectUnitOfWorkTest
 
         // Assert Results
         System.assertEquals(didFail, true, 'didFail');
-        System.assert(caughtEx.getMessage().contains('Work failed.'), String.format('Exception message was ', new List<String> { caughtEx.getMessage() }));
+        System.assert(caughtEx.getMessage().contains('Work failed.'), String.format('Exception message was {0}', new List<String> { caughtEx.getMessage() }));
 
         assertEvents(new List<String> {
                 'onCommitWorkStarting'