xunit-net-collection-fixtures

Class1.cs

using FluentAssertions;
using Xunit;

namespace FooTests
{
    /// <summary>
    /// https://xunit.github.io/docs/shared-context.html#collection-fixture
    /// 
    /// Important note: Fixtures can be shared across assemblies, but collection definitions must 
    /// be in the same assembly as the test that uses them.
    /// </summary>
    // Important: Remove call to IClassFixture when using Collection Fixtures!
    [Collection("mycollection")]
    public class Class1 // : IClassFixture<SomeFixture>
    {
        public Class1(SomeFixture fixture)
        {
            var foo = "called before every test in Class1"; // <- Breakpoint here
        }

        [Fact]
        public void Test1()
        {
            1.Should().Be(1); // <- Breakpoint here
        }

        [Fact]
        public void Test2()
        {
            1.Should().Be(1); // <- Breakpoint here
        }
    }

    // Important: Remove call to IClassFixture when using Collection Fixtures!
    [Collection("mycollection")]
    public class Class2 //: IClassFixture<SomeFixture>
    {
        public Class2(SomeFixture fixture)
        {
            var foo = "called before every test in Class2"; // <- Breakpoint here
        }

        [Fact]
        public void Test1()
        {
            1.Should().Be(1); // <- Breakpoint here
        }

        [Fact]
        public void Test2()
        {
            1.Should().Be(1); // <- Breakpoint here
        }
    }

    public class SomeFixture
    {
        public SomeFixture()
        {
            // The following break point should be hit only once!
            var x = "Should only be called once!"; // <- Breakpoint here
        }
    }

    [CollectionDefinition("mycollection")]
    public class SomeCollection : ICollectionFixture<SomeFixture>
    {
        // marker class
    }
}