Cheatography
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Stub - Just a replacement
// Create a stub
var mock = new Mock<IMyDependency>();
// Get the Stub
var myDep = mock.Object;
Assert.That(myDep .GetValue(), Is.EqualTo(0));
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By default: Methods with returning types return default values. (e.g. int GetValue() returns 0;
Spy - What happened?
// Create a spy
var mock = new Mock<IMyDependency>();
// Spy on executions
mock.Verify(myDep => myDep.GetValue());
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Optional:
Verify can be called with optional argument that asserts how many times the method as called: AtLeastOnce, AtLeast, AtMost, AtMostOnce, BetweenExclusive, BetweenInclusive, Exactly, Once, Never
Tip: Always strive to use concrete expectations. Avoid AtMost, AtLeast and Between.
Spy via Callbacks
// Create a spy
var mock = new Mock<IMyDependency>();
string usedArg;
mock
// Setup to capture any call to done to DoSomething method.
.Setup(myDep => myDep.DoSomething(It.IsAny<String>())
// Callback function is called when DoSomething was called.
.Callback<String>(arg => usedArg = arg);
// Executing with "test" argument
mock.Object.DoSomething("test");
Assert.That(usedArg, Is.EqualTo("test"));
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Mock - Do what I say!
// Create a mock
var mock = new Mock<IMyDependency>();
mock
// What behavior is going to be mocked
.Setup(myDep => myDep.GetValue())
// What's going to be returned by GetValue()
.Returns(1);
// Using the object
var myDep = mock.Object;
Assert.That(myDep .GetValue(), Is.EqualTo(1));
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Mock - Setup - Matching Arguments
Expected Argument |
Setup |
1 |
Setup(e => e.Get(1))
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Any |
Setup(e => e.Get(It.IsAny<int>())
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> 10 |
Setup(e => e.Get(It.Is<int>(i => i > 10))
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Range [0..10] |
Setup(e => e.Get(It.IsInRange<int>(0, 10, Range.Inclusive))
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An instance of a mock can have more than 1 setup for a given method provided we setup the method with different arguments.
Tip: Avoid using non specific values on capture, except when it's possible to validate what was provided.
Mock - Setup - Returns
value |
Setup(...).Returns(value)
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access argument |
Setup(...).Returns(arg => arg + 10)
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Throw exception |
Setup(...).Throws<Exception>()
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Throw exception with message |
Setup(...).Throws(new Exception("My Message"))
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Lazy access |
Setup(...).Returns(() => value)
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