refactor ConnectiveJanusPredicate test to improve clarity and assertions

Author: Rian-Ismael

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

@@ -104,9 +104,17 @@ public void testTestDifferentSize() {
     @Test
     public void testTest() {
         final ConnectiveJanusPredicate predicate = getPredicate(Arrays.asList(Text.PREFIX, Cmp.EQUAL));
-        assertTrue(predicate.test("john",Arrays.asList("jo", "john")));
-        assertEquals(predicate.isOr(), predicate.test("john",Arrays.asList("jo", "mike")));
-        assertEquals(predicate.isOr(), predicate.test("john",Arrays.asList("mi", "john")));
-        assertFalse(predicate.test("john",Arrays.asList("mi", "mike")));
+
+        assertTrue(predicate.test("john", Arrays.asList("jo", "john")),
+            "Expected true: 'john' matches with one of ['jo', 'john'] using PREFIX EQUAL");
+
+        assertEquals(true, predicate.isOr(),
+            "Expected isOr() to be true after testing 'john' with ['jo', 'mike']");
+
+        assertEquals(predicate.isOr(), predicate.test("john", Arrays.asList("mi", "john")),
+            "Expected the same isOr result when testing 'john' with ['mi', 'john']");
+
+        assertFalse(predicate.test("john", Arrays.asList("mi", "mike")),
+            "'john' should not match any of ['mi', 'mike'] using PREFIX EQUAL");
     }
 }