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tentamen

a tiny JavaScript testing framework

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tentamen

tentamen is a tiny (less than 50 source lines of code) JavaScript testing framework.\ it uses deep equality, so you can test against arrays and objects with ease.

install

npm i --save tentamen

usage

import Tentamen from 'tentamen';
let tentamen = new Tentamen({
  fn: str => str.startsWith('a')
});

tentamen.suite('truthy cases');
tentamen.add('absolutely', 'absolutely', true);
tentamen.add('acknowledge', 'acknowledge', true);

tentamen.suite('falsy cases');
tentamen.add('tentamen', 'tentamen', false);
tentamen.add('percentage', 'percentage', false);

tentamen.done();
$ node test.js
truthy cases
  o absolutely
  o acknowledge
falsy cases
  o tentamen
  o percentage

4 of 4 tests passing

API

new Tentamen(obj)

obj

type: object

fn

type: function

the function to run tests on.

before(input)

type: function

a function to manipulate the input to each test before the test runs.

after(output)

type: function

a function to manipulate the output of each test before tentamen verifies it.

error(e)

type: function

a function to manipulate the output of tests that fail with an error, given the error object.\ this decides what goes below the title of the failing test:

let tentamen = new Tentamen({
  fn: str => str.concat('a'),
  error: e => e.stack.split('\n')[0]
});

tentamen.suite('concat');
tentamen.add('number + string', 1, '1a');
$ node test.js
concat
  x number + string
    TypeError: str.concat is not a function

the return value of this function must be of type string.\ if this is omitted, it will return the original object by default.

afterError(e)

type: function

a function to further manipulate the output of this.error.\ if a test fails with an error, but the output of this function equals the test's expected value, the test will pass:

let tentamen = new Tentamen({
  fn: str => str.concat('a'),
  error: e => e.stack.split('\n')[0],
  afterError: e => e.slice(0, e.indexOf(':'))
});

// this.error returns the message from the stack,
// and this.afterError will slice that to its type

tentamen.suite('concat');
tentamen.add('number + string', 1, 'TypeError'); // should pass
$ node test.js
concat
  o number + string

this can be used to write tests which should be allowed to fail.

tentamen.suite(title, fn?)

start a new group of tests.

title

type: string

the suite title.

fn

type: function

a new function to replace the current value of this.fn with.

tentamen.add(title, input, expected)

run a new test.

title

type: string

the test title.

input

type: any

the input to the test. this value will be manipulated by this.before first.

expected

type: any

the expected output of the test, after it has been manipulated by this.after (or this.afterError, if applicable).

tentamen.done()

finish testing, and output the number of passing tests.

you can support the development of this project and others via Patreon:

Support me on Patreon

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