static void Main(string[] args)
{
DatabaseReader databaseReader = new DatabaseReader();
StockChecker stockChecker = new StockChecker(databaseReader);
int stock = stockChecker.NumberInStock("ABC123");
Console.WriteLine("Number in stock: " + stock);
Console.ReadLine();
}
public void TestNumberInStock_CallsTheReadQuantityMethodOfOurDatabaseReader_WhenCalled()
{
//Arrange
Mock <IDatabaseReader> mockDatabaseReader = new Mock <IDatabaseReader>();
string isbn = "ABC123"; //string isbn for act
StockChecker stockChecker = new StockChecker(mockDatabaseReader.Object); //Object
//Act
stockChecker.NumberInStock(isbn); //Method
//Assert
//Not interested in what this test returns, just that it behaves in the way we want. Want to verify the database reader had its read method quanitity called
mockDatabaseReader.Verify(r => r.ReadQuantity(It.IsAny <string>()), Times.Once);
}
public void Test_NumberInStock_returns3WhenThereAre3MatchingBooksInTheDatabase()
{
//Arrange
string isbn = "ABC123";
int expected = 3;
Mock <IDatabaseReader> mockDatabaseReader = new Mock <IDatabaseReader>();
mockDatabaseReader.Setup(r => r.ReadQuantity(isbn)).Returns(3); //this is called stubbing
StockChecker stockChecker = new StockChecker(mockDatabaseReader.Object);
//Act
int actual = stockChecker.NumberInStock(isbn);
//Assert
Assert.AreEqual(expected, actual);
}