@Test
    void verifyAttributeMergerOriginal() {
        val merger = CoreAuthenticationUtils.getAttributeMerger(PrincipalAttributesCoreProperties.MergingStrategyTypes.SOURCE);
        val m1 = CollectionUtils.<String, List<Object>>wrap("key1", CollectionUtils.wrapList("value1"));
        val m2 = CollectionUtils.<String, List<Object>>wrap("key2", CollectionUtils.wrapList("value2"));
        val result = merger.mergeAttributes(m1, m2);
        assertEquals(m1, result);
    }
This is {@link CoreAuthenticationUtilsTests}.

@author Misagh Moayyed
@since 5.2.0
core/cas-server-core-authentication/src/test/java/org/apereo/cas/authentication/CoreAuthenticationUtilsTests.java