Example of testing TypeOrm with Jest and Sqlite in-memory database

example-typeorm-jest.test.ts

import { createConnection, getConnection, Entity, getRepository } from "typeorm";
import { PrimaryGeneratedColumn, Column } from "typeorm";

@Entity()
export class MyEntity {
    @PrimaryGeneratedColumn()
    id?: number;

    @Column()
    name?: string;
}

beforeEach(() => {
    return createConnection({
        type: "sqlite",
        database: ":memory:",
        dropSchema: true,
        entities: [MyEntity],
        synchronize: true,
        logging: false
    });
});

afterEach(() => {
    let conn = getConnection();
    return conn.close();
});

test("store Joe and fetch it", async () => {
    await getRepository(MyEntity).insert({
        name: "Joe"
    });
    let joe = await getRepository(MyEntity).find({
        where: {
            id: 1
        }
    });
    expect(joe[0].name).toBe("Joe");
});

test("store Another and fetch it", async () => {
    await getRepository(MyEntity).insert({
        name: "Another"
    });
    let joe = await getRepository(MyEntity).find({
        where: {
            id: 1
        }
    });
    expect(joe[0].name).toBe("Another");
});