protected void assertContainsAll(File file, ImmutableMap<String, Object> expectedAttributes) {
    for (Map.Entry<String, Object> entry : expectedAttributes.entrySet()) {
      String attribute = entry.getKey();
      Object value = entry.getValue();

      assertThat(provider.get(file, attribute)).isEqualTo(value);
    }
  }
Creates the set of providers the provider being tested depends on.
jimfs/src/test/java/com/google/common/jimfs/AbstractAttributeProviderTest.java