private void TestThatConcatenationYields(string left, string right, string expectedResult)
{
var leftExpr = new StringLiteral(left);
var rightExpr = new StringLiteral(right);
var concatExpr = new ConcatenationExpression(leftExpr, rightExpr);
concatExpr.TryEvaluate(EmptyEnvironment, out string actualResult).Should().BeTrue();
actualResult.Should().Be(expectedResult);
}
public void TestThatEvalFailsIfEitherExpressionCannotBeEvaluated()
{
var concat = new ConcatenationExpression(AnyUnevaluatableExpr, AnyEvaluatableExpr);
concat.TryEvaluate(EmptyEnvironment, out string value).Should().BeFalse();
concat = new ConcatenationExpression(AnyEvaluatableExpr, AnyUnevaluatableExpr);
concat.TryEvaluate(EmptyEnvironment, out value).Should().BeFalse();
}