public static ValAssertion valString(final String expected) {
        return (Val actual) ->
                Assertions.assertThat(actual)
                        .isEqualTo(ValString.create(expected));
    }
@param expectedSubStrings sub-strings that are expected to appear in the error message in any order.
stroom-query/stroom-query-language/src/test/java/stroom/query/language/functions/ValAssertions.java