How to create a stub for relation models

[somu1251]

I have created hasManyThrough relation for 2 model

Like: this.repository.operations(id).create(operation);

I am able to create operation and relation for it. But when I am trying to write test cases for those methods having issues.

repository.stubs.create.resolves('test');

can anyone help me to create stub for this.repository.operations(id).create(operation);

Thanks.