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jest-each-table

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jest-each-table

Create a test-case table for use with Jest's test.each tagged template literal

  • 2.0.0
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jest-each-table

Take advantage of jest's test.each tagged template literal functionality without needing to hardcode the test-cases as template literals.

Usage

import createTestTable from 'jest-each-table';

const testcases = createTestTable(
  [...Array(10)].map((_, i) => ({
    inputs: { left: i, right: i },
    output: i + i
  }))
);

const testsuite = test.each(...testcases);

testsuite('$inputs.left + $inputs.right = $output', ({ inputs, output }) => {
  expect(inputs.left + inputs.right).toBe(output);
});

Context

Jest's test.each functionality can be used in two ways:

  1. test.each (function): This allows an Array of Arrays with the arguments that are passed into the test fn for each row.
  2. test.each (tagged template literal): This allows a table of test-cases to be defined as an ES2015 string template.

Unfortunately test.each (the function) uses printf formatting for creating the test title which has serious drawbacks compared to how the title is formatted using test.each (the tagged template literal) which supports $variable.

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Package last updated on 24 Aug 2021

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