private static boolean assertStatementsAreEquivalent(GrAssertStatement statement1, GrAssertStatement statement2) {
    return expressionsAreEquivalent(statement1.getAssertion(), statement2.getAssertion()) &&
      expressionsAreEquivalent(statement1.getErrorMessage(), statement2.getErrorMessage());
  }
private static boolean assertStatementsAreEquivalent(GrAssertStatement statement1, GrAssertStatement statement2)