public async Task TestThat_WriteMessage_When_MessageIsNull_Throws_ArgumentNullException()
{
// Arrange
var outputProviderMock = new Mock <IConsoleOutputProvider>();
var dataWriter = new ConsoleMessageDataWriter(outputProviderMock.Object);
// Act
async Task Act() => await dataWriter.WriteMessage(MockObjects.NullMessage);
// Assert
await Assert.ThrowsAsync <ArgumentNullException>(Act);
}
public async Task TestThat_WriteMessage_When_MessageIsValid_Calls_OutputProviderOutputMethod_Once()
{
// Arrange
var outputProviderMock = new Mock <IConsoleOutputProvider>();
var mockMessage = MockObjects.ValidMessage;
var dataWriter = new ConsoleMessageDataWriter(outputProviderMock.Object);
// Act
await dataWriter.WriteMessage(mockMessage);
// Assert
outputProviderMock.Verify(x => x.OutputStringLine(mockMessage), Times.Once);
}
public async Task TestThat_WriteMessage_When_OutputProviderThrowsException_Throws_SameException()
{
// Arrange
var mockException = MockObjects.GenericException;
var outputProviderMock = new Mock <IConsoleOutputProvider>();
outputProviderMock
.Setup(x => x.OutputStringLine(It.IsAny <string>()))
.Throws(mockException);
var dataWriter = new ConsoleMessageDataWriter(outputProviderMock.Object);
// Act
async Task Act() => await dataWriter.WriteMessage(MockObjects.ValidMessage);
// Assert
var exception = await Assert.ThrowsAnyAsync <Exception>(Act);
Assert.Equal(mockException, exception);
}