AsyncUnityTests.cs

using NUnit.Framework;
using System.Threading.Tasks;

public class AsyncTest {
    async Task<string> Subject() {
        await Task.Delay(1000);
        return "test";
    }

    [Test]
    public async void Async() {
        var result = await Subject();
        Assert.AreEqual(result, "test");
        Assert.That(false); // 失敗してくれない
    }

    [Test]
    public void Wait() {
        var task = Subject();
        task.Wait();    // Unity Editorの応答がなくなる
        Assert.That(false);
    }
}