LinkTests.cs

using Bogus;

using FluentAssertions;

using System.Collections.Generic;

using Xunit;
using Xunit.Categories;

namespace Candoumbe.Forms.UnitTests;

[Feature(nameof(Candoumbe.Forms))]
[Feature(nameof(Link))]
public class LinkTests
{
    private static readonly Faker Faker = new();

    [Fact]
    public void Ctor_builds_valid_instance()
    {
        // Act
        Link link = new();

        // Assert
        link.Href.Should().BeNull();
        link.Method.Should().BeNull();
        link.Relations.Should().BeEmpty();
        link.Template.Should().BeNull();
        link.Title.Should().BeNull();
        link.Relations.Should().BeEmpty();
    }

    [Theory]
    [InlineData("a/link/", false, "a relative link with no placeholder")]
    [InlineData("a/link/{id}", true, "the relative link contains a placeholder")]
    [InlineData("a/link/?id={id}", true, "the relative link contains a placeholder in its query string")]
    public void Compute_template_correctly(string href, bool expected, string reason)
    {
        // Arrange

        // Act
        Link link = new() { Href = href };

        // Assert
        link.Template.Should()
            .Be(expected, reason);
    }

    [Theory]
    [InlineData(null, false, "null is not a URI template")]
    [InlineData("", false, "empty string is not a URI template")]
    [InlineData("a/link/", false, "a relative link with no placeholder")]
    [InlineData("a/link/{id}", true, "the relative link contains a placeholder")]
    [InlineData("a/link/?id={id}", true, "the relative link contains a placeholder in its query string")]
    [InlineData("a/{resource}/{id}", true, "the relative link contains two placeholders")]
    public void IsTemplate_returns_correct_result(string href, bool expected, string reason)
    {
        // Act
        bool result = Link.IsTemplate(href);

        // Assert
        result.Should().Be(expected, reason);
    }

    [Fact]
    public void Given_existing_link_already_relations_When_adding_a_relation_that_already_exists_Then_there_should_be_no_duplicates()
    {
        // Arrange
        string relation = Faker.Lorem.Word();

        // Act
        Link link = new() { Relations = new HashSet<string> { relation, relation } };

        // Assert
        link.Relations.Should()
            .HaveCount(1).And
            .OnlyContain(rel => rel == relation);

    }

}