for (int i = 0; i < 10; i++) {
          assertEquals(unfiltered.lower(i), filtered.lower(i));
          assertEquals(unfiltered.floor(i), filtered.floor(i));
          assertEquals(unfiltered.ceiling(i), filtered.ceiling(i));
          assertEquals(unfiltered.higher(i), filtered.higher(i));
        }
      }
    }
  }

  private FilteredCollectionsTestUtil() {}

    unfiltered.put("foo", 55556);
    unfiltered.put("badkey", 1);
    unfiltered.put("foo", 1);
    Multimap<String, Integer> keyFiltered = filterKeys(unfiltered, KEY_PREDICATE);
    Multimap<String, Integer> filtered = filterValues(keyFiltered, VALUE_PREDICATE);
    assertEquals(1, filtered.size());
    assertTrue(filtered.containsEntry("foo", 1));

    unfiltered.put("foo", 55556);
    unfiltered.put("badkey", 1);
    unfiltered.put("foo", 1);
    Multimap<String, Integer> keyFiltered = filterKeys(unfiltered, KEY_PREDICATE);
    Multimap<String, Integer> filtered = filterValues(keyFiltered, VALUE_PREDICATE);
    assertEquals(1, filtered.size());
    assertTrue(filtered.containsEntry("foo", 1));

        List<MavenProject> filtered = new ArrayList<>(projects.size());
        for (MavenProject project : projects) {
            if (whiteList.containsKey(project)) {
                filtered.add(project);
            } else if (!transitive) {
                filtered.addAll(upstream ? getUpstreamProjects(project, false) : getDownstreamProjects(project, false));
            }
        }

        <directory>${project.basedir}/src/main/resources-filtered</directory>
        <filtering>true</filtering>
      </resource>
    </resources>
    <testResources>
      <testResource>
        <directory>${project.basedir}/src/test/resources</directory>
      </testResource>
      <testResource>
        <directory>${project.basedir}/src/test/resources-filtered</directory>
        <filtering>true</filtering>

        <directory>${project.basedir}/src/main/resources-filtered</directory>
        <filtering>true</filtering>
      </resource>
    </resources>
    <testResources>
      <testResource>
        <directory>${project.basedir}/src/test/resources</directory>
      </testResource>
      <testResource>
        <directory>${project.basedir}/src/test/resources-filtered</directory>
        <filtering>true</filtering>

  }

  private TestSuite filterSuite(TestSuite suite) {
    TestSuite filtered = new TestSuite(suite.getName());
    Enumeration<?> tests = suite.tests();
    while (tests.hasMoreElements()) {
      Test test = (Test) tests.nextElement();
      if (matches(test)) {
        filtered.addTest(test);
      }
    }
    return filtered;
  }

    List<String> expected = emptyList();
    List<String> actual = Lists.newArrayList(filtered);
    assertEquals(expected, actual);
  }

  public void testFilterMatchAll() {
    Iterator<String> unfiltered = Lists.newArrayList("foo", "bar").iterator();
    Iterator<String> filtered = filter(unfiltered, Predicates.alwaysTrue());

    multimap.put("baz", 3);
    multimap.put("bar", 4);

    SetMultimap<String, Integer> filtered =
        filterKeys(multimap, Predicates.in(ImmutableSet.of("foo", "bar")));

    assertEquals(ImmutableSet.of(), filtered.replaceValues("baz", ImmutableSet.<Integer>of()));

    assertThrows(
        IllegalArgumentException.class, () -> filtered.replaceValues("baz", ImmutableSet.of(5)));
  }

  }

  private TestSuite filterSuite(TestSuite suite) {
    TestSuite filtered = new TestSuite(suite.getName());
    Enumeration<?> tests = suite.tests();
    while (tests.hasMoreElements()) {
      Test test = (Test) tests.nextElement();
      if (matches(test)) {
        filtered.addTest(test);
      }
    }
    return filtered;
  }