Sybil/Sybil.UnitTests/BaseConstructorBuilderTests.cs

using FluentAssertions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;

namespace Sybil.Tests;

[TestClass]
public class BaseConstructorBuilderTests
{
    private const string EmptyBase = ": base()";
    private const string TestBase = ": base(test)";

    private readonly BaseConstructorBuilder builder;

    public BaseConstructorBuilderTests()
    {
        this.builder = new BaseConstructorBuilder();
    }

    [TestMethod]
    public void WithArgument_NullArgument_ThrowsArgumentNullException()
    {
        var action = () =>
        {
            this.builder.WithArgument(null);
        };

        action.Should().Throw<ArgumentNullException>();
    }

    [TestMethod]
    public void WithArgument_ValidArgument_ReturnsBuilder()
    {
        var returnedBuilder = this.builder.WithArgument("test");

        returnedBuilder.Should().NotBeNull().And.Subject.Should().Be(this.builder);
    }

    [TestMethod]
    public void Build_ReturnsConstructorInitializerSyntax()
    {
        var syntax = this.builder.Build();

        syntax.Should().NotBeNull().And.Subject.Should().BeOfType<ConstructorInitializerSyntax>();
    }

    [TestMethod]
    public void EmptyBaseConstructor_ReturnsExpectedString()
    {
        var result = this.builder.Build().ToFullString();

        result.Should().Be(EmptyBase);
    }

    [TestMethod]
    public void WithArgument_ShouldReturnExpectedString()
    {
        var result = this.builder
            .WithArgument("test")
            .Build()
            .ToFullString();

        result.Should().Be(TestBase);
    }
}