Github user trkurc commented on the pull request:
https://github.com/apache/nifi/pull/116#issuecomment-157213254
@jskora what would you expect the following unit tests to do?
```
@Test
public void testInvalidRegex() {
final TestRunner runner = TestRunners.newTestRunner(new
UpdateAttribute());
runner.setProperty("Delete Attributes Expression", "(");
final Map<String, String> attributes = new HashMap<>();
attributes.put("attribute.1", "value.1");
runner.enqueue(new byte[0], attributes);
runner.run();
}
@Test
public void testInvalidRegexInAttribute() {
final TestRunner runner = TestRunners.newTestRunner(new
UpdateAttribute());
runner.setProperty("Delete Attributes Expression", "${butter}");
final Map<String, String> attributes = new HashMap<>();
attributes.put("butter", "(");
runner.enqueue(new byte[0], attributes);
runner.run();
}
```
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