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POMoq - Create mocked instance for constructor injected object
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copied!<h2>Question</h2> <p>I want to create a unit test for <code>Credentials</code> class that verifies the password for a given credentials after executing <code>Calculate()</code> method it its equal to the password calculated by an object that implements <code>IPasswordCalculator</code> interface.</p> <p>Actually, the mock object that I created returns <code>string.Empty</code> value when calls <code>Calculate(ICredentials)</code> method, instead of <code>Pa$$w0rd</code>, that would be the desired return.</p> <p>Then...</p> <ul> <li>How I can implement this test without having to manually create a stub class?</li> <li>How I can define the callback method on mock object to always return <code>Pa$$w0rd</code>?</li> </ul> <p>Thanks in advance.</p> <h2>Code</h2> <p><strong>IPasswordCalculator interface</strong></p> <pre><code>/// <summary> /// The password calculator interface. /// </summary> public interface IPasswordCalculator { /// <summary> /// Calculates the user password using /// <paramref name="credentials"/> instance. /// </summary> /// <param name="credentials"> /// <see cref="ICredentials"/> to perform the calculation. /// </param> void Calculate(ICredentials credentials); } </code></pre> <p><strong>ICredentials interface</strong></p> <pre><code>/// <summary> /// The Credentials interface. /// </summary> public interface ICredentials { /// <summary> /// Gets or sets the user password. /// </summary> string Password { get; set; } /// <summary> /// Gets the user name. /// </summary> string Username { get; } /// <summary> /// Calculates the password. /// </summary> void Calculate(); } </code></pre> <p><strong>Credentials implementation</strong></p> <pre><code>/// <summary> /// User credentials. /// </summary> public sealed class Credentials : ICredentials { /// <summary> /// Initializes a new instance of the <see cref="Credentials" /> class. /// </summary> /// <param name="passwordCalculator"> /// The credentials calculator. /// </param> /// <param name="username"> /// The user name. /// </param> public Credentials(IPasswordCalculator passwordCalculator, string username) { this.Calculator = passwordCalculator; this.Username = username; this.Password = string.Empty; } /// <summary> /// Calculates the password. /// </summary> public void Calculate() { if (null != this.Calculator) { this.Calculator.Calculate(this); } } } </code></pre> <p><strong>Test</strong></p> <pre><code> /// <summary> /// Calculate should set password value expected using calculator. /// </summary> [TestMethod] public void CalculateShouldSetPasswordValueExpectedUsingCalculator() { ICredentials credentials = null; var repo = new MockRepository(MockBehavior.Default); var mock = repo.Create<IPasswordCalculator>(); mock.Setup(x => x.Calculate(credentials)) .Callback(() => { credentials.Password = "Pa$$w0rd"; }); IPasswordCalculator calculator = mock.Object; credentials = new Credentials(calculator, "Me"); credentials.Calculate(); Assert.AreEqual("Pa$$w0rd", credentials.Password); // Fail } </code></pre>

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