@Test
  public void testResolveEntityNullSystemId() throws Exception {
    final String systemId = null;
    final InputSource inputSource = getEntityResolver().resolveEntity(null, systemId);
    assertNull(inputSource);
  }
Test {@link PivotalEntityResolver#resolveEntity(String, String)} with <code>null</code>
<code>systemId</code>. Asserts that returns to <code>null</code>.

@since GemFire 8.1
geode-core/src/test/java/org/apache/geode/internal/cache/xmlcache/AbstractEntityResolverTest.java