public void ShouldSetRegionIsSpecified([Frozen]Mock<IAppHarborClient> client, [Frozen]Mock<TextWriter> writer, Mock<CreateAppCommand> command, string regionName, string applicationSlug) { client.Setup(x => x.CreateApplication(applicationSlug, regionName)).Returns(new CreateResult { Id = applicationSlug }); command.Object.Execute(new string[] { applicationSlug, "-r", regionName }); client.VerifyAll(); }