This is a short introduction to EasyMoc framework.
Easy Moq is a simple framework which provide possiblities to mock objects. It can be used in projects created in .NET Core. Framework don't have any dependencies to other libraries.
Below are described most common usage scenarios.
We can create an object based on interface. All methods will return default .NET values.
var mock = new Mock<IUserService>();We can create object based on interface and we can specify values/objetcs which selected methods should returns.
var mock = new Mock<IUserService>();
mock.Setup(x => x.MethodReturnsInt()).Returns(666);
int number = mock.Object.MethodReturnsInt();
Assert.Equal(666, number);Method whith parameters.
var mock = new Mock<IUserService>();
mock.Setup(x => x.MethodWithValueParameter(It.IsAny<int>())).Returns(24);
int value = mock.Object.MethodWithValueParameter(1);
Assert.Equal(24, value);We can also create object based on interface and specify that some methods should throw an exception.
var mock = new Mock<IUserService>();
mock.Setup(x => x.SimplestMethod()).Throws(new FormatException());
Assert.Throws<FormatException>(() => mock.Object.SimplestMethod());Also framework provide a possiblities to count number of method executions. After running test we can check how many times specific method was executed. We can check exact amount.
var mock = new Mock<IUserService>();
mock.Object.MethodWithValueParameter(1);
mock.Object.MethodWithValueParameter(2);
mock.Object.MethodWithValueParameter(3);
mock.Verify(m => m.MethodWithValueParameter(It.IsAny<int>()), Times.Exactly(3));Or we can use methods like: "AtLeast", "AtLeastOnce', "AtMost", "AtMostOnce", "Between", "Never", "Once", for example:
var mock = new Mock<IUserService>();
mock.Object.MethodWithValueParameter(1);
Assert.Throws<MockException>(() => mock.Verify(m => m.MethodWithValueParameter(It.IsAny<int>()), Times.Never));Still there are missing features, like:
- matching method arguments,
- stub properties,
- stub events,
- callbacks.