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POOverriding Binding in Guice
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copied!<p>I've just started playing with Guice, and a use-case I can think of is that in a test I just want to override a single binding. I think I'd like to use the rest of the production level bindings to ensure everything is setup correctly and to avoid duplication.</p> <p>So imagine I have the following Module</p> <pre><code>public class ProductionModule implements Module { public void configure(Binder binder) { binder.bind(InterfaceA.class).to(ConcreteA.class); binder.bind(InterfaceB.class).to(ConcreteB.class); binder.bind(InterfaceC.class).to(ConcreteC.class); } } </code></pre> <p>And in my test I only want to override InterfaceC, while keeping InterfaceA and InterfaceB in tact, so I'd want something like:</p> <pre><code>Module testModule = new Module() { public void configure(Binder binder) { binder.bind(InterfaceC.class).to(MockC.class); } }; Guice.createInjector(new ProductionModule(), testModule); </code></pre> <p>I've also tried the following, with no luck:</p> <pre><code>Module testModule = new ProductionModule() { public void configure(Binder binder) { super.configure(binder); binder.bind(InterfaceC.class).to(MockC.class); } }; Guice.createInjector(testModule); </code></pre> <p>Does anyone know if it's possible to do what I want or am I completely barking up the wrong tree??</p> <p>--- Follow up: It would seem I can achieve what I want if I make use of the @ImplementedBy tag on the interface and then just provide a binding in the test case, which works nicely when there is a 1-1 mapping between the interface and implementation.</p> <p>Also, after discussing this with a colleague it would seem we'd head down the road of overriding an entire module and ensuring we have our modules defined correctly. This seems like it might cause a problem though where a binding is misplaced in a module and needs to be moved, thus possibly breaking a load of tests as bindings may no longer be available to be overriden.</p>

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