Which do you prefer?

CollapsedExample.cs

using Moq;
using NUnit.Framework;
using Should;
//and some other stuff

namespace WorkerTests
{
	[TestFixture]
	public class Worker_CreateThingFromContractTests
	{
		private Worker _worker;
		private Mock<IApi> _fakeApi;
		private Thing _createdThing;

		[Test]
		public void creates_thing_from_contract()
		{
			var contract = new Contract()
			{
				Id = "2000",
				Name = "some name",
				Days = "6",
				Account = new Nested() { Name = "Nonya Incorporated"},
				Contact = new Contact() { Name = "Name", Email = "something@something.com"},
				TotalAmount = "5000"
			};

			_fakeApi = new Mock<IApi>();
			_fakeApi.Setup(x => x.Create(It.IsAny<Thing>())).Await()
				.Callback((IThing thing) =>
				{
					_createdThing = (Thing)thing;
				});

			var fakeApp = new Mock<IApp>();
			fakeApp.Setup(x => x.Target).Returns("13");

			_worker = new Worker(_fakeApi.Object, fakeApp.Object);

			var result = _worker.CreateThing(Contract, "Ready", "fakeSub.domain.com.net.org").Result;

			_fakeV1.Verify(x => x.Create(It.IsAny<Thing>()), Times.Once);
			_createdThing.Name.ShouldEqual("Contract Nonya Incorporated");
			_createdThing.Description.ShouldEqual("Contract Doc : <a href='https://fakeSub.domain.com.net.org/2000'>Contract-100</a><br /> Primary Contact : Name something@something.com");
			_createdThing.Reference.ShouldEqual("2000");
		}
	}
}

ExpandedExample.cs

using Moq;
using NUnit.Framework;
using Should;
//and some other stuff

namespace WorkerTests
{
	[TestFixture]
	public class Worker_CreateThingFromContractTests
	{
		private Worker _worker;
		private Mock<IApi> _fakeApi;
		private Thing _createdThing;

		[OneTimeSetUp]
		public void Setup()
		{
			var contract = new Contract()
			{
				Id = "2000",
				Name = "some name",
				Days = "6",
				Account = new Nested() { Name = "Nonya Incorporated"},
				Contact = new Contact() { Name = "Name", Email = "something@something.com"},
				TotalAmount = "5000"
			};

			_fakeApi = new Mock<IApi>();
			_fakeApi.Setup(x => x.Create(It.IsAny<Thing>())).Await()
				.Callback((IThing thing) =>
				{
					_createdThing = (Thing)thing;
				});

			var fakeApp = new Mock<IApp>();
			fakeApp.Setup(x => x.Target).Returns("13");

			_worker = new Worker(_fakeApi.Object, fakeApp.Object);

			var result = _worker.CreateThing(Contract, "Ready", "fakeSub.domain.com.net.org").Result;
		}

		[Test]
		public void posts_data_to_api()
		{
			_fakeV1.Verify(x => x.Create(It.IsAny<Thing>()), Times.Once);
		}

		[Test]
		public void sets_the_title_as_contract()
		{
			_createdThing.Name.ShouldEqual("Contract Nonya Incorporated");
		}

		[Test]
		public void sets_the_contract_description()
		{
			_createdThing.Description.ShouldEqual("Contract Doc : <a href='https://fakeSub.domain.com.net.org/2000'>Contract-100</a><br /> Primary Contact : Name something@something.com");
		}

		[Test]
		public void sets_the_reference_on_the_contract()
		{
			_createdThing.Reference.ShouldEqual("2000");
		}
	}
}