src/main/java/org/fest/assertions/internal/Maps.java
public <V> void assertDoesNotContainValue(Description description, Map<?, ?> actual, V value) {
    assertNotNull(description, actual);
    if (actual.containsValue(value)) {
      throw failures.failure(description, shouldNotContainValue(actual, value));
    }
  }
public <V> void assertDoesNotContainValue(Description description, Map<?, ?> actual, V value) {
    assertNotNull(description, actual);
    if (actual.containsValue(value)) {
      throw failures.failure(description, shouldNotContainValue(actual, value));
    }
  }
Asserts that the actual map does not contain the given value.

@param description contains information about the assertion.
@param actual the given {@code Map}.
@param value the given value
@throws AssertionError if the actual map is {@code null}.
@throws AssertionError if the actual map contains the given value.