code: public void assertNotEmpty(Description description, Map<?, ?> actual) {
      assertNotNull(description, actual);
      if (actual.isEmpty()) {
        throw failures.failure(description, shouldNotBeEmpty());
      }
    }
docs: Asserts that the given {@code Map} is not empty.
  
  @param description contains information about the assertion.
  @param actual the given {@code Map}.
  @throws AssertionError if the given {@code Map} is {@code null}.
  @throws AssertionError if the given {@code Map} is empty.