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It is partly inspired by sinon's callArg fucntionality.\n\n### Installation\n\n`npm install jest-call-arg --save-dev`\n\n### Usage\n\nImport in the test file you want to use it:\n\nCommonJS:\n\n```js\nconst { callArg, callArgWith } = require(\"jest-call-arg\");\n```\n\nES6 Modules\n\n```js\nimport { callArg, callArgWith } from \"jest-call-arg\";\n```\n\n### `callArg(mockFn, [position=0])`\n\nCalls the callback argument at the given position (default is 0);\n\n```js\nconst mockFn = jest.fn();\nconst callback = jest.fn();\n\nmockFn(\"test\", callback);\n\ncallArg(mockFn, 1);\n\nexpect(callback).toHaveBeenCalled(); // Passes\n```\n\n### `callArgWith(mockFn, [position=0], [arg1, arg2, ...])`\n\nSame as `callArg` but with optional arguments to pass to the callback.\n\n```js\nconst mockFn = jest.fn();\nconst callback = jest.fn();\n\nmockFn(callback);\n\ncallArgWith(mockFn, 0, \"Hello world\");\n\nexpect(callback).toHaveBeenCalledWith(\"Hello world\"); // Passes\n```\n\n### `callArgOnWith(mockFn, [position=0], context, [arg1, arg2, ...])`\n\nSame as `callArgWith` but with the ability to override the `this` context for the callback.\n\n### `callEventHandler(mockFn, [eventName])`\n\nWhen the argument at position 0 matches the event name, calls the callback argument at position 1.\n\n```js\nconst mockedElement = { addEventListener: jest.fn() };\nconst callback = jest.fn();\n\nmockedElement.addEventListener(\"click\", callback);\nmockedElement.addEventListener(\"change\", callback);\n\ncallEventHandler(mockedElement.addEventListener, \"click\");\n\nexpect(callback).toHaveBeenCalledTimes(1); // Passes\n```\n\n### `callEventHandlerWith(mockFn, [eventName], [arg1, arg2, ....])`\n\nSame as `callEventHandler` but then with the ability to pass arguments to the callback.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fngerritsen%2Fjest-call-arg","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fngerritsen%2Fjest-call-arg","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fngerritsen%2Fjest-call-arg/lists"}