How can I mock Prisma client with es6 (Without typescript) in jest?

user_8176912 0
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The Prisma Documentation has examples of mocking the client and doing unit testing using jest and typescript. Is there any way to mock the client in jest without using TypeScript?

I would be grateful if you can give a simple example.

Small Thing to add: I am using dependency injection in my project in all the functions that use the prisma.

prisma jestjs node.js orm unit-testing
2 Answers
user_72678010

My solution for now: I am manually mocking the database object and passing it to the function that uses it: I am not sure how useful this but it helps avoid making calls to the real database.

const mocked_db = {
    user: {
        findFirst: jest.fn(() => Promise.resolve(
            {
                id: 2,
                first_name: "Basel",
                last_name: "Akasha"
            }
        ))
    }
}

it("It should work blah blah bla", async () => {
    let user_details= {
       id: 2,
       first_name: "Basel",
       last_name: "Akasha"
    }
    
    let signup = await getUser(
        mocked_db // takes thew DB object is a parameter (normally you would pass your Prisma client instance)
    )

    await expect(.... // whatever you'r expect is
})'
user_81769120
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