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copied!<p>If it is needed to test delegates I usually apply them to any test object. In order to test PersonService I'd rather use the following code that contains examples of two tests.</p> <pre><code>[TestClass] public class UnitTest2 { private Mock<IRepository> moqRepository; private PersonService service; [TestInitialize] public void TestInitialize() { moqRepository = new Mock<IRepository>(); service = new PersonService(moqRepository.Object); } [TestMethod] public void TestMethod3() { // arrange var persons = new List<Person> { new Person { Age = 0 }, new Person { Age = 1 }, new Person { Age = 17 }, new Person { Age = 18 }, new Person { Age = 19 }, new Person { Age = 100 } }; moqRepository .Setup(x => x.GetForExpression(It.IsAny<Expression<Func<Person, bool>>>())) .Returns<Expression<Func<Person, bool>>>(expr => persons.Where(expr.Compile()).ToList()); // act var result = service.GetAllPersonsWith18More(); // assert moqRepository.VerifyAll(); result.Should().BeEquivalentTo(persons.Where(x => x.Age > 18)); } [TestMethod] public void TestMethod4() { // arrange Expression<Func<Person, bool>> criteria = x => x.Age > 18; moqRepository .Setup(x => x.GetForExpression(It.IsAny<Expression<Func<Person, bool>>>())) .Returns(new List<Person>()) .Callback<Expression<Func<Person, bool>>>(expr => { var persons = new List<Person> { new Person { Age = 0 }, new Person { Age = 1 }, new Person { Age = 17 }, new Person { Age = 18 }, new Person { Age = 19 }, new Person { Age = 100 } }; persons.Where(expr.Compile()).Should().BeEquivalentTo(persons.Where(criteria.Compile())); }); // act service.GetAllPersonsWith18More(); // assert moqRepository.VerifyAll(); } } </code></pre>

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