jest.config.js

// For a detailed explanation regarding each configuration property, visit:
// https://jestjs.io/docs/en/configuration.html

module.exports = {
    // Use ts-jest to enable correct code coverage
    preset: "ts-jest",

    // Automatically clear mock calls and instances between every test
    clearMocks: true,

    // The directory where Jest should output its coverage files
    coverageDirectory: "coverage",

    // An array of regexp pattern strings used to skip coverage collection
    coveragePathIgnorePatterns: ["/node_modules/", "__tests__", "__mocks__", ".json", ".js", "index.ts"],
    collectCoverageFrom: ["<rootDir>/src/**/*.ts"],

    // Log all the individual tests
    verbose: true,

    // Make calling deprecated APIs throw helpful error messages
    errorOnDeprecated: true,

    // The test environment that will be used for testing
    testEnvironment: "node",

    // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
    testPathIgnorePatterns: ["/node_modules/", "/dist"],
    testMatch: ["**/__tests__/**/*.spec.ts"],

    roots: ["<rootDir>/src/"]
    // setupFiles: ["<rootDir>/src/__tests__/testSetup.ts"]
};