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443
node_modules/jest-each/README.md
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<div align="center">
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<h1>jest-each</h1>
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Jest Parameterised Testing
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</div>
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<hr />
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[](https://www.npmjs.com/package/jest-each) [](http://npm-stat.com/charts.html?package=jest-each&from=2017-03-21) [](https://github.com/facebook/jest/blob/master/LICENSE)
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A parameterised testing library for [Jest](https://jestjs.io/) inspired by [mocha-each](https://github.com/ryym/mocha-each).
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jest-each allows you to provide multiple arguments to your `test`/`describe` which results in the test/suite being run once per row of parameters.
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## Features
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- `.test` to runs multiple tests with parameterised data
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- Also under the alias: `.it`
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- `.test.only` to only run the parameterised tests
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- Also under the aliases: `.it.only` or `.fit`
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- `.test.skip` to skip the parameterised tests
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- Also under the aliases: `.it.skip` or `.xit` or `.xtest`
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- `.describe` to runs test suites with parameterised data
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- `.describe.only` to only run the parameterised suite of tests
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- Also under the aliases: `.fdescribe`
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- `.describe.skip` to skip the parameterised suite of tests
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- Also under the aliases: `.xdescribe`
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- Asynchronous tests with `done`
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- Unique test titles with [`printf` formatting](https://nodejs.org/api/util.html#util_util_format_format_args):
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- `%p` - [pretty-format](https://www.npmjs.com/package/pretty-format).
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- `%s`- String.
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- `%d`- Number.
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- `%i` - Integer.
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- `%f` - Floating point value.
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- `%j` - JSON.
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- `%o` - Object.
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- `%#` - Index of the test case.
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- `%%` - single percent sign ('%'). This does not consume an argument.
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- 🖖 Spock like data tables with [Tagged Template Literals](#tagged-template-literal-of-rows)
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---
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- [Demo](#demo)
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- [Installation](#installation)
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- [Importing](#importing)
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- APIs
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- [Array of Rows](#array-of-rows)
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- [Usage](#usage)
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- [Tagged Template Literal of rows](#tagged-template-literal-of-rows)
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- [Usage](#usage-1)
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## Demo
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#### Tests without jest-each
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#### Tests can be re-written with jest-each to:
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**`.test`**
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**`.test` with Tagged Template Literals**
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**`.describe`**
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## Installation
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`npm i --save-dev jest-each`
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`yarn add -D jest-each`
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## Importing
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jest-each is a default export so it can be imported with whatever name you like.
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```js
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// es6
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import each from 'jest-each';
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```
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```js
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// es5
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const each = require('jest-each');
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```
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## Array of rows
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### API
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#### `each([parameters]).test(name, testFn)`
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##### `each`:
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- parameters: `Array` of Arrays with the arguments that are passed into the `testFn` for each row
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- _Note_ If you pass in a 1D array of primitives, internally it will be mapped to a table i.e. `[1, 2, 3] -> [[1], [2], [3]]`
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##### `.test`:
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- name: `String` the title of the `test`.
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- Generate unique test titles by positionally injecting parameters with [`printf` formatting](https://nodejs.org/api/util.html#util_util_format_format_args):
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- `%p` - [pretty-format](https://www.npmjs.com/package/pretty-format).
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- `%s`- String.
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- `%d`- Number.
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- `%i` - Integer.
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- `%f` - Floating point value.
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- `%j` - JSON.
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- `%o` - Object.
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- `%#` - Index of the test case.
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- `%%` - single percent sign ('%'). This does not consume an argument.
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- testFn: `Function` the test logic, this is the function that will receive the parameters of each row as function arguments
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#### `each([parameters]).describe(name, suiteFn)`
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##### `each`:
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- parameters: `Array` of Arrays with the arguments that are passed into the `suiteFn` for each row
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- _Note_ If you pass in a 1D array of primitives, internally it will be mapped to a table i.e. `[1, 2, 3] -> [[1], [2], [3]]`
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##### `.describe`:
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- name: `String` the title of the `describe`
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- Generate unique test titles by positionally injecting parameters with [`printf` formatting](https://nodejs.org/api/util.html#util_util_format_format_args):
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- `%p` - [pretty-format](https://www.npmjs.com/package/pretty-format).
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- `%s`- String.
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- `%d`- Number.
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- `%i` - Integer.
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- `%f` - Floating point value.
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- `%j` - JSON.
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- `%o` - Object.
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- `%#` - Index of the test case.
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- `%%` - single percent sign ('%'). This does not consume an argument.
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- suiteFn: `Function` the suite of `test`/`it`s to be ran, this is the function that will receive the parameters in each row as function arguments
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### Usage
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#### `.test(name, fn)`
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Alias: `.it(name, fn)`
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```js
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each([[1, 1, 2], [1, 2, 3], [2, 1, 3]]).test(
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'returns the result of adding %d to %d',
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(a, b, expected) => {
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expect(a + b).toBe(expected);
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},
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);
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```
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#### `.test.only(name, fn)`
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Aliases: `.it.only(name, fn)` or `.fit(name, fn)`
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```js
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each([[1, 1, 2], [1, 2, 3], [2, 1, 3]]).test.only(
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'returns the result of adding %d to %d',
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(a, b, expected) => {
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expect(a + b).toBe(expected);
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},
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);
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```
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#### `.test.skip(name, fn)`
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Aliases: `.it.skip(name, fn)` or `.xit(name, fn)` or `.xtest(name, fn)`
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```js
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each([[1, 1, 2], [1, 2, 3], [2, 1, 3]]).test.skip(
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'returns the result of adding %d to %d',
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(a, b, expected) => {
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expect(a + b).toBe(expected);
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},
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);
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```
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#### Asynchronous `.test(name, fn(done))`
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Alias: `.it(name, fn(done))`
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```js
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each([['hello'], ['mr'], ['spy']]).test(
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'gives 007 secret message: %s',
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(str, done) => {
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const asynchronousSpy = message => {
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expect(message).toBe(str);
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done();
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};
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callSomeAsynchronousFunction(asynchronousSpy)(str);
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},
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);
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```
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#### `.describe(name, fn)`
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```js
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each([[1, 1, 2], [1, 2, 3], [2, 1, 3]]).describe(
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'.add(%d, %d)',
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(a, b, expected) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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test('does not mutate first arg', () => {
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a + b;
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expect(a).toBe(a);
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});
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test('does not mutate second arg', () => {
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a + b;
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expect(b).toBe(b);
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});
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},
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);
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```
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#### `.describe.only(name, fn)`
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Aliases: `.fdescribe(name, fn)`
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```js
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each([[1, 1, 2], [1, 2, 3], [2, 1, 3]]).describe.only(
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'.add(%d, %d)',
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(a, b, expected) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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},
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);
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```
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#### `.describe.skip(name, fn)`
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Aliases: `.xdescribe(name, fn)`
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```js
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each([[1, 1, 2], [1, 2, 3], [2, 1, 3]]).describe.skip(
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'.add(%d, %d)',
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(a, b, expected) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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},
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);
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```
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---
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## Tagged Template Literal of rows
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### API
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#### `each[tagged template].test(name, suiteFn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.test('returns $expected when adding $a to $b', ({a, b, expected}) => {
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expect(a + b).toBe(expected);
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});
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```
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##### `each` takes a tagged template string with:
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- First row of variable name column headings seperated with `|`
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- One or more subsequent rows of data supplied as template literal expressions using `${value}` syntax.
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##### `.test`:
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- name: `String` the title of the `test`, use `$variable` in the name string to inject test values into the test title from the tagged template expressions
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- To inject nested object values use you can supply a keyPath i.e. `$variable.path.to.value`
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- testFn: `Function` the test logic, this is the function that will receive the parameters of each row as function arguments
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#### `each[tagged template].describe(name, suiteFn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.describe('$a + $b', ({a, b, expected}) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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test('does not mutate first arg', () => {
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a + b;
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expect(a).toBe(a);
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});
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test('does not mutate second arg', () => {
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a + b;
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expect(b).toBe(b);
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});
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});
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```
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##### `each` takes a tagged template string with:
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- First row of variable name column headings seperated with `|`
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- One or more subsequent rows of data supplied as template literal expressions using `${value}` syntax.
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##### `.describe`:
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- name: `String` the title of the `test`, use `$variable` in the name string to inject test values into the test title from the tagged template expressions
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- To inject nested object values use you can supply a keyPath i.e. `$variable.path.to.value`
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- suiteFn: `Function` the suite of `test`/`it`s to be ran, this is the function that will receive the parameters in each row as function arguments
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### Usage
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#### `.test(name, fn)`
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Alias: `.it(name, fn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.test('returns $expected when adding $a to $b', ({a, b, expected}) => {
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expect(a + b).toBe(expected);
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});
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```
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#### `.test.only(name, fn)`
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Aliases: `.it.only(name, fn)` or `.fit(name, fn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.test.only('returns $expected when adding $a to $b', ({a, b, expected}) => {
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expect(a + b).toBe(expected);
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});
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```
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#### `.test.skip(name, fn)`
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Aliases: `.it.skip(name, fn)` or `.xit(name, fn)` or `.xtest(name, fn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.test.skip('returns $expected when adding $a to $b', ({a, b, expected}) => {
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expect(a + b).toBe(expected);
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});
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```
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#### Asynchronous `.test(name, fn(done))`
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Alias: `.it(name, fn(done))`
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```js
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each`
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str
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${'hello'}
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${'mr'}
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${'spy'}
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`.test('gives 007 secret message: $str', ({str}, done) => {
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const asynchronousSpy = message => {
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expect(message).toBe(str);
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done();
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};
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callSomeAsynchronousFunction(asynchronousSpy)(str);
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});
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```
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#### `.describe(name, fn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.describe('$a + $b', ({a, b, expected}) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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test('does not mutate first arg', () => {
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a + b;
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expect(a).toBe(a);
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});
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test('does not mutate second arg', () => {
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a + b;
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expect(b).toBe(b);
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});
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});
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```
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#### `.describe.only(name, fn)`
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Aliases: `.fdescribe(name, fn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.describe.only('$a + $b', ({a, b, expected}) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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});
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```
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#### `.describe.skip(name, fn)`
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Aliases: `.xdescribe(name, fn)`
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```js
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each`
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a | b | expected
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${1} | ${1} | ${2}
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${1} | ${2} | ${3}
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${2} | ${1} | ${3}
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`.describe.skip('$a + $b', ({a, b, expected}) => {
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test(`returns ${expected}`, () => {
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expect(a + b).toBe(expected);
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});
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});
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```
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## License
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MIT
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