jest.config.json

{
    "roots": [
        "<rootDir>"
    ],
    "preset": "ts-jest",
    "testEnvironment": "node",
    "transform": {
        "^.+\\.ts?$": "ts-jest"
    },
    "modulePaths": [
        "<rootDir>/node_modules",
        "<rootDir>/src"
    ],
    "testMatch": [
        "**/?(*.)+(spec|test).[tj]s?(x)"
    ],
    "moduleNameMapper": {
        "^src/(.*)$": "<rootDir>/src/$1"
    },
    "collectCoverage": true,
    "collectCoverageFrom": [
        "src/**/*.{ts,tsx}"
    ],
    "coveragePathIgnorePatterns": [
        "<rootDir>/node_modules"
    ],
    "coverageReporters": [
        "json",
        "lcov",
        "text"
    ],
    "coverageThreshold": {
        "global": {
            "branches": 100,
            "functions": 100,
            "lines": 100,
            "statements": 100
        }
    },
    "moduleFileExtensions": [
        "ts",
        "js",
        "json"
    ]
}