[Demonstration 1]

[Buggy Method]
public void searchResultsNull(ActiveSearchNotifier notifier, IInteractionElement searchNode, int dos) throws IOException, CoreException {
    List<?> results = test.search(dos, searchNode);
    assertNull("Results Not Null", results);
    notifier.clearContext();
}

[Buggy Hunk]
assertNull("Results Not Null", results);

[Patch]
Assert.assertNull("Results Not Null", results);

[Demonstration 2]

[Buggy Method]
@Test
public void nullTest() throws JSONReaderException {
    Object result = ObjectDeserializer.getFromReader(new java.io.StringReader("{\"myString\": \"Hola mundo\", \"myBoolean\": true, \"myNull\": null, \"myDate\": \"1973-12-22T03:10:00.000Z\", \"myInternalClass\": {\"myString\": \"inside...\"}, \"myInteger\": 12345}"), null);
    assertTrue(Map.class.isAssignableFrom(result.getClass()));
    Map map = (Map) result;
    assertEquals("inside...", ((Map) map.get("myInternalClass")).get("myString"));
}

[Buggy Hunk]
Object result = ObjectDeserializer.getFromReader(new java.io.StringReader("{\"myString\": \"Hola mundo\", \"myBoolean\": true, \"myNull\": null, \"myDate\": \"1973-12-22T03:10:00.000Z\", \"myInternalClass\": {\"myString\": \"inside...\"}, \"myInteger\": 12345}"), null);

[Patch]
Object result = ObjectDeserializer.getFromReader(new StringReader("{\"myString\": \"Hola mundo\", \"myBoolean\": true, \"myNull\": null, \"myDate\": \"1973-12-22T03:10:00.000Z\", \"myInternalClass\": {\"myString\": \"inside...\"}, \"myInteger\": 12345}"), null);

[Demonstration 3]

[Buggy Method]
@Test
public void should_process_filled_array_correctly() {
    unit.setContextData(FILLED_ARRAY);
    String result = unit.getArrayStringRepresentation();
    MatcherAssert.assertThat(result, Matchers.is(Base64.getEncoder().encodeToString(FILLED_ARRAY)));
}

[Buggy Hunk]
MatcherAssert.assertThat(result, Matchers.is(Base64.getEncoder().encodeToString(FILLED_ARRAY)));

[Patch]
MatcherAssert.assertThat(result, Matchers.is(DatatypeConverter.printBase64Binary(FILLED_ARRAY)));