Add unit tests for conditional schema loading: cases below V7

Author: zgyorffi

core/src/test/java/org/everit/json/schema/loader/SchemaLoaderTest.java

@@ -174,6 +174,18 @@ public void conditionalSchemaIfThenElse() {
         Assert.assertTrue(actual.getElseSchema().isPresent());
     }
 
+    @Test
+    public void conditionalSchemaLoadingV4() {
+        Schema actual = SchemaLoader.load(get("conditionalSchemaIf"));
+        assertFalse(actual instanceof ConditionalSchema);
+    }
+
+    @Test
+    public void conditionalSchemaLoadingV6() {
+        Schema actual = loadAsV6(get("conditionalSchemaIf"));
+        assertFalse(actual instanceof ConditionalSchema);
+    }
+
     @Test(expected = SchemaException.class)
     public void invalidExclusiveMinimum() {
         SchemaLoader.load(get("invalidExclusiveMinimum"));