jest.config.json

{
    "preset": "ts-jest",
    "testEnvironment": "node",
    "rootDir": "./",
    "coverageDirectory": "<rootDir>/coverage",
    "collectCoverageFrom": ["<rootDir>/src/**/*.ts", "!<rootDir>/src/**/constant.ts", "!<rootDir>/src/**/type.ts"],
    "testPathIgnorePatterns": ["<rootDir>/node_modules"],
    "coverageReporters": ["html", "json"],
    "testMatch": ["<rootDir>/src/**/*.spec.ts", "<rootDir>/src/**/*.test.ts"]
}