@NullUnmarked
public class PatternFilenameFilterTest extends TestCase {

  public void testSyntaxException() {
    assertThrows(PatternSyntaxException.class, () -> new PatternFilenameFilter("("));
  }

  public void testAccept() {
    File dir = new File("foo");
    FilenameFilter filter = new PatternFilenameFilter("a+");
    assertTrue(filter.accept(dir, "a"));
    assertTrue(filter.accept(dir, "aaaa"));
    assertFalse(filter.accept(dir, "b"));