Update OrJanusPredicateTest.java

Improves the readability of the test. The assertions are clearer and include descriptive messages, making it easier to identify which assertion fails. This enhances code maintainability, understanding and debugging efficiency.

Signed-off-by: Rian-Ismael <106334437+Rian-Ismael@users.noreply.github.com>

janusgraph-test/src/test/java/org/janusgraph/graphdb/predicate/OrJanusPredicateTest.java

@@ -47,8 +47,10 @@ ConnectiveJanusPredicate getNegatePredicate(List<JanusGraphPredicate> childPredi
 
     @Test
     public void testIsQNF() {
-        assertTrue(getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL)).isQNF());
-        assertTrue(getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL, new OrJanusPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL)))).isQNF());
-        assertFalse(getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL, new AndJanusPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL)))).isQNF());
+        assertTrue(getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL)).isQNF(), "Single PREFIX EQUAL should be QNF");
+        assertTrue(getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL, new OrJanusPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL)))).isQNF(), 
+            "PREFIX EQUAL with OR(JANUS(PREFIX EQUAL)) should be QNF");
+        assertFalse(getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL, new AndJanusPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL)))).isQNF(), 
+            "PREFIX EQUAL with AND(JANUS(PREFIX EQUAL)) should not be QNF");
     }
 }