OsMock

OsMock is a preset for mocking operating system information using Jest in Node.js projects.

📦 Installation

First, install Jest (if you haven’t already):

npm install jest --save-dev

Then, install OsMock:

npm install os-mock --save-dev

⚙️ Configuration

Add to your jest config file (e.g., jest.config.js) the following line:

{
    preset: "os-mock",
}

Optional

Add the following configuration to your Jest config file:

{
    // Your previews config...
    globals: {
        osMock: {
            platform: "darwin",
            hostname: "macbook-pro",
            cpuModel: "Apple M1",
            totalmem: 16 * 1024 * 1024 * 1024,
            freemem: 8 * 1024 * 1024 * 1024,
        }
    }
}

These values will be used to mock the information provided by Node.js's os module during test execution.

💡 Example Usage

const os = require("os");

test("should return the mocked hostname", () => {
  expect(os.hostname()).toBe("macbook-pro");
});