{"id":22820787,"url":"https://github.com/EpicEric/jest-mock-process","last_synced_at":"2025-08-10T11:32:15.300Z","repository":{"id":48919624,"uuid":"142928002","full_name":"EpicEric/jest-mock-process","owner":"EpicEric","description":"Easily mock NodeJS process properties in 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jest-mock-process [![npm version](https://badge.fury.io/js/jest-mock-process.svg)](https://www.npmjs.com/package/jest-mock-process) [![CircleCI](https://circleci.com/gh/EpicEric/jest-mock-process/tree/main.svg?style=svg)](https://circleci.com/gh/EpicEric/jest-mock-process/tree/main) [![Coverage Status](https://coveralls.io/repos/github/EpicEric/jest-mock-process/badge.svg?branch=main)](https://coveralls.io/github/EpicEric/jest-mock-process?branch=master)\n\nEasily mock NodeJS process properties in Jest.\n\n## Installation\n\n```sh\nnpm install --save-dev jest-mock-process\n```\n\n## Usage\n\nTypeScript example.\n\n```typescript\nimport {\n  mockProcessExit,\n  mockProcessStdout,\n  mockProcessStderr,\n  mockProcessUptime,\n  mockConsoleLog,\n} from \"jest-mock-process\";\n\nlet mockExit = mockProcessExit();\nprocess.exit(1);\nexpect(mockExit).toHaveBeenCalledWith(1);\nmockExit = mockProcessExit(new Error(\"Mock\"));\nexpect(() =\u003e process.exit(0)).toThrowError(\"Mock\");\n\nconst mockStdout = mockProcessStdout();\nprocess.stdout.write(\"Hello, world!\");\nexpect(mockStdout).toHaveBeenCalledWith(\"Hello, world!\");\n\nconst mockStderr = mockProcessStderr();\nprocess.stderr.write(\"Error\");\nexpect(mockStderr).toHaveBeenCalledWith(\"Error\");\n\nconst mockUptime = mockProcessUptime(3.14159);\nconst uptimeValue = process.uptime();\nexpect(uptimeValue).toEqual(3.14159);\n\nconst mockLog = mockConsoleLog();\nconsole.log(\"Browser log\");\nexpect(mockLog).toHaveBeenCalledWith(\"Browser log\");\n\nmockExit.mockRestore();\nmockStdout.mockRestore();\nmockStderr.mockRestore();\nmockUptime.mockRestore();\nmockLog.mockRestore();\n```\n\n### Advanced usage\n\n- You can use `mockedRun` (or `asyncMockedRun`) to set-up a virtual environment that will automatically create and restore provided mocks:\n\n```typescript\nimport { mockedRun, MockedRunResult } from \"jest-mock-process\";\n\nconst mockRun = mockedRun({\n  stdout: mockProcessStdout,\n  stderr: mockProcessStderr,\n  exit: mockProcessExit,\n  log: mockConsoleLog,\n});\nconst mockEnvironment = mockRun(() =\u003e {\n  process.stdout.write(\"stdout payload\");\n  process.stderr.write(\"stderr payload\");\n  process.exit(-1);\n  console.log(\"log payload\");\n  return 10;\n});\nexpect(mockEnvironment.result).toEqual(10);\nexpect(mockEnvironment.error).toBeUndefined();\nexpect(mockEnvironment.mocks.stdout).toHaveBeenCalledTimes(1);\nexpect(mockEnvironment.mocks.log).toHaveBeenCalledWith(\"log payload\");\n```\n\n**NOTE: The above is a breaking change in version 2.0.0, as the provided mocks are now limited to the `mocks` object.**\n\n- You can mock generic methods not supported by default in `jest-mock-process` with the `spyOnImplementing` function:\n\n```typescript\nimport { spyOnImplementing } from \"jest-mock-process\";\n\nconst mockStdin = spyOnImplementing(process.stdin, \"read\", () =\u003e \"\");\nprocess.stdin.read(1024);\nexpect(mockStdin).toHaveBeenCalledWith(1024);\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2FEpicEric%2Fjest-mock-process","html_url":"https://awesome.ecosyste.ms/projects/github.com%2FEpicEric%2Fjest-mock-process","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2FEpicEric%2Fjest-mock-process/lists"}