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How to stub a Typescript-interface or type definition?

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Sometimes, we want to stub a Typescript-interface or type definition.

In this article, we’ll look at how to stub a Typescript-interface or type definition.

How to stub a Typescript-interface or type definition?

To stub a Typescript-interface or type definition, we can use the typemoq library.

For instance, we write

import * as TypeMoq from "typemoq";
//...
let mock = TypeMoq.Mock.ofType<IDependency>();

mock.setup((x) => x.b()).returns(() => "Hello World");

expect(mock.object.a()).to.eq(undefined);
expect(mock.object.b()).to.eq("Hello World");

to import TypeMoq from typemoq.

Then we use TypeMoq.Mock.ofType<IDependency> to create a mocked type from the IDependency type.

And then we can use the mock with the content in IDependency without errors.

Conclusion

To stub a Typescript-interface or type definition, we can use the typemoq library.

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