src/main/java/org/fest/assertions/Fail.java
protected static void failIfActualIsNull(@Nullable String customErrorMessage, @Nullable Description description,
                                           @Nullable Object actual) {
    if (actual != null) {
      return;
    }
    failWithMessage(customErrorMessage);
    fail(description, array("expecting actual value not to be null"));
  }
protected static void failIfActualIsNull(@Nullable String customErrorMessage, @Nullable Description description,
                                           @Nullable Object actual) {
    if (actual != null) {
      return;
    }
    failWithMessage(customErrorMessage);
    fail(description, array("expecting actual value not to be null"));
  }
Throws an {@code AssertionError} if the actual value is {@code null}.

@param customErrorMessage any custom error message. This message will replace the default one only if it (the
custom message) is not {@code null}.
@param description        the description of the actual value.
@param actual             the actual value.
@throws AssertionError if the actual value is {@code null}.
@since 1.3