public void it_should_pass_data_to_file_writer()
{
// arrange
var order = new Order {OrderId = 1001, OrderTotal = 10.53M};
var mockFileWriter = new Mock<IFileWriter>();
var orderWriter = new OrderWriter(mockFileWriter.Object);
// act
orderWriter.WriteOrder(order);
// assert
mockFileWriter.Verify(fw => fw.WriteLine("1001,10.53"), Times.Exactly(1));
// method is not executed, expression tree is veryfied
mockFileWriter.Verify(fw => fw.WriteLine(It.IsAny<string>()), Times.Once());
// use regex
mockFileWriter.Verify(fw => fw.WriteLine(It.IsRegex("^1001")), Times.Once());
// use predicate
mockFileWriter.Verify(fw => fw.WriteLine(It.Is<string>(s => s.Length > 3)), Times.Once());
mockFileWriter.Verify(fw => fw.WriteLine(It.Is<string>(s => s.StartsWith("1001,10.53"))), Times.Once());
// can use local variable
string expectedValue = "1001,10.53";
mockFileWriter.Verify(fw => fw.WriteLine(It.Is<string>(s => s.StartsWith(expectedValue))), Times.Once());
// verify property
mockFileWriter.VerifySet(fw => fw.FileName = It.IsAny<string>());
mockFileWriter.VerifySet(fw => fw.FileName = "1001.txt");
mockFileWriter.VerifySet(fw => fw.FileName = It.Is<string>(s => s.StartsWith("1001")));
}
public void it_should_pass_data_to_file_writer2()
{
// arrange
var order = new Order { OrderId = 1001, OrderTotal = 10.53M };
var mockFileWriter = new Mock<IFileWriter>();
mockFileWriter.Setup(fw => fw.WriteLine("1001,10.53"));
var orderWriter = new OrderWriter(mockFileWriter.Object);
// act
orderWriter.WriteOrder(order);
// assert
mockFileWriter.Verify(fw => fw.WriteLine(It.IsAny<string>()), Times.AtMostOnce());
}