graphql-validity/test/helpers/mocks.ts

Make business logic validation easy on the graphql side without adding any declarations or modifications to the existing graphql schema.

import * as sinon from "sinon";

export function mockModule<T extends { [K: string]: any }>(
    moduleToMock: T,
    defaultMockValuesForMock: Partial<{ [K in keyof T]: T[K] }>
) {
    return (
        sandbox: sinon.SinonSandbox,
        returnOverrides?: Partial<{ [K in keyof T]: T[K] }>
    ): void => {
        const functions = Object.keys(moduleToMock);
        const returns = returnOverrides || {} as any;
        functions.forEach((f) => {
            sandbox.stub(moduleToMock, f).callsFake(returns[f] || defaultMockValuesForMock[f]);
        });
    };
}