public async Task Test1()
{
// arrange
_durableOrchestrationContextMock.Setup(x => x.CallActivityAsync <string>("Function1_Hello", "Tokyo")).ReturnsAsync("Hello Tokyo!");
_durableOrchestrationContextMock.Setup(x => x.CallActivityAsync <string>("Function1_Hello", "Seattle")).ReturnsAsync("Hello Seattle!");
_durableOrchestrationContextMock.Setup(x => x.CallActivityAsync <string>("Function1_Hello", "London")).ReturnsAsync("Hello London!");
// act
var result = await Function1.RunOrchestrator(_durableOrchestrationContextMock.Object);
// assert
Assert.Equal(3, result.Count);
Assert.Equal("Hello Tokyo!", result[0]);
Assert.Equal("Hello Seattle!", result[1]);
Assert.Equal("Hello London!", result[2]);
}