class ShouldContainKeys extends BasicErrorMessageFactory {

  private ShouldContainKeys(Object actual, Object key) {
    super("%nExpecting:%n  %s%nto contain key:%n  %s", actual, key);
  }

  private ShouldContainKeys(Object actual, Object[] keys, Set<?> keysNotFound) {
    super("%nExpecting:%n  %s%nto contain keys:%n  %s%nbut could not find:%n  %s", actual, keys, keysNotFound);
  }

  /**
   * Creates a new <code>{@link ShouldContainKeys}</code>.
   *
   * @param actual the actual value in the failed assertion.
   * @param keys the expected keys.
   * @param keysNotFound the missing keys.
   * @return the created {@code ErrorMessageFactory}.
   */
  public static ErrorMessageFactory shouldContainKeys(Object actual, Object[] keys, Set<?> keysNotFound) {<FILL_FUNCTION_BODY>}
}

    return keys.length == 1 ? new ShouldContainKeys(actual, keys[0]) : new ShouldContainKeys(actual, keys, keysNotFound);
  
<methods>public transient void <init>(java.lang.String, java.lang.Object[]) ,public java.lang.String create(org.assertj.core.description.Description, org.assertj.core.presentation.Representation) ,public java.lang.String create(org.assertj.core.description.Description) ,public java.lang.String create() ,public boolean equals(java.lang.Object) ,public int hashCode() ,public java.lang.String toString() <variables>protected final non-sealed java.lang.Object[] arguments,protected final non-sealed java.lang.String format,org.assertj.core.error.MessageFormatter formatter