ottobackwards commented on a change in pull request #4012: NIFI-7055 
createListValidator should treat "," as invalid
URL: https://github.com/apache/nifi/pull/4012#discussion_r384669241
 
 

 ##########
 File path: 
nifi-commons/nifi-utils/src/test/java/org/apache/nifi/util/validator/TestStandardValidators.java
 ##########
 @@ -184,6 +184,25 @@ public void testListValidator() {
         assertFalse(vr.isValid());
         assertEquals(1, mockValidator.getValidateCallCount());
 
+        // An empty list is the same as null, "" or " "
+        vr = val.validate("List", ",", validationContext);
+        assertFalse(vr.isValid());
+        assertEquals(0, mockValidator.getValidateCallCount());
+
+        vr = val.validate("List", " , ", validationContext);
+        assertFalse(vr.isValid());
+        assertEquals(1, mockValidator.getValidateCallCount());
+
+        // will evaluate to no entry
+        vr = val.validate("List", ",,,,", validationContext);
+        assertFalse(vr.isValid());
+        assertEquals(0, mockValidator.getValidateCallCount());
+
+        // will evaluate to an empty element
+        vr = val.validate("List", ",foo", validationContext);
 
 Review comment:
   Yes, that is how the tests were already

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