@Test
    public void testSetNullLinkedIdWhenAlreadySet() {
        UserProfile profile = new CommonProfile();
        profile.setLinkedId("dummyLinkecId");
        profile.setLinkedId(null);
        assertNull(profile.getLinkedId());
    }
This class tests the {@link CommonProfile} class.
@author Jerome Leleu
@since 1.0.0
pac4j-core/src/test/java/org/pac4j/core/profile/CommonProfileTests.java