@nestjs/testing/testing-instance-loader.js

Nest - modern, fast, powerful node.js web framework (@testing)

import { InstanceLoader } from '@nestjs/core/internal';
export class TestingInstanceLoader extends InstanceLoader {
    async createInstancesOfDependencies(modules = this.container.getModules(), mocker) {
        this.injector.setContainer(this.container);
        mocker && this.injector.setMocker(mocker);
        await super.createInstancesOfDependencies();
    }
}