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copied!<p>You can use constructor dependency injection. Example:</p> <pre><code>public class SingletonDependedClass { private string _ProviderName; public SingletonDependedClass() : this(ConfigurationManager.ConnectionStrings["main_db"].ProviderName) { } public SingletonDependedClass(string providerName) { _ProviderName = providerName; } } </code></pre> <p>That allows you to pass connection string directly to object during testing.</p> <p>Also if you use Visual Studio Team Edition testing framework you can make constructor with parameter private and test the class through the accessor.</p> <p>Actually I solve that kind of problems with mocking. Example:</p> <p>You have a class which depends on singleton:</p> <pre><code>public class Singleton { public virtual string SomeProperty { get; set; } private static Singleton _Instance; public static Singleton Insatnce { get { if (_Instance == null) { _Instance = new Singleton(); } return _Instance; } } protected Singleton() { } } public class SingletonDependedClass { public void SomeMethod() { ... string str = Singleton.Insatnce.SomeProperty; ... } } </code></pre> <p>First of all <code>SingletonDependedClass</code> needs to be refactored to take <code>Singleton</code> instance as constructor parameter:</p> <pre><code>public class SingletonDependedClass { private Singleton _SingletonInstance; public SingletonDependedClass() : this(Singleton.Insatnce) { } private SingletonDependedClass(Singleton singletonInstance) { _SingletonInstance = singletonInstance; } public void SomeMethod() { string str = _SingletonInstance.SomeProperty; } } </code></pre> <p>Test of <code>SingletonDependedClass</code> (<a href="http://code.google.com/p/moq/" rel="noreferrer">Moq mocking library</a> is used):</p> <pre><code>[TestMethod()] public void SomeMethodTest() { var singletonMock = new Mock<Singleton>(); singletonMock.Setup(s => s.SomeProperty).Returns("some test data"); var target = new SingletonDependedClass_Accessor(singletonMock.Object); ... } </code></pre>

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