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# tape tap-producing test harness for node and browsers [](http://ci.testling.com/substack/tape) [](http://travis-ci.org/substack/tape)  # browser compatibility chrome, firefox, opera, safari, IE6, IE7, IE8, IE9 using [email protected] # example ``` js var test = require('tape'); test('timing test', function (t) { t.plan(2); t.equal(typeof Date.now, 'function'); var start = Date.now(); setTimeout(function () { t.equal(Date.now() - start, 100); }, 100); }); ``` ``` $ node example/timing.js TAP version 13 # timing test ok 1 should be equal not ok 2 should be equal --- operator: equal expected: 100 actual: 107 ... 1..2 # tests 2 # pass 1 # fail 1 ``` # methods The assertion methods in tape are heavily influenced or copied from the methods in [node-tap](https://github.com/isaacs/node-tap). ``` var test = require('tape') ``` ## test(name, cb) Create a new test with an optional `name` string. `cb(t)` fires with the new test object `t` once all preceeding tests have finished. Tests execute serially. If you forget to `t.plan()` out how many assertions you are going to run and you don't call `t.end()` explicitly, your test will hang. ## t.plan(n) Declare that `n` assertions should be run. `t.end()` will be called automatically after the `n`th assertion. If there are any more assertions after the `n`th, or after `t.end()` is called, they will generate errors. ## t.end() Declare the end of a test explicitly. ## t.fail(msg) Generate a failing assertion with a message `msg`. ## t.pass(msg) Generate a passing assertion with a message `msg`. ## t.skip(msg) Generate an assertion that will be skipped over. ## t.ok(value, msg) Assert that `value` is truthy with an optional description message `msg`. Aliases: `t.true()`, `t.assert()` ## t.notOk(value, msg) Assert that `value` is falsy with an optional description message `msg`. Aliases: `t.false()`, `t.notok()` ## t.error(err, msg) Assert that `err` is falsy. If `err` is non-falsy, use its `err.message` as the description message. Aliases: `t.ifError()`, `t.ifErr()`, `t.iferror()` ## t.equal(a, b, msg) Assert that `a === b` with an optional description `msg`. Aliases: `t.equals()`, `t.isEqual()`, `t.is()`, `t.strictEqual()`, `t.strictEquals()` ## t.notEqual(a, b, msg) Assert that `a !== b` with an optional description `msg`. Aliases: `t.notEquals()`, `t.notStrictEqual()`, `t.notStrictEquals()`, `t.isNotEqual()`, `t.isNot()`, `t.not()`, `t.doesNotEqual()`, `t.isInequal()` ## t.deepEqual(a, b, msg) Assert that `a` and `b` have the same structure and nested values using [node's deepEqual() algorithm](https://github.com/substack/node-deep-equal) with strict comparisons (`===`) on leaf nodes and an optional description `msg`. Aliases: `t.deepEquals()`, `t.isEquivalent()`, `t.same()` ## t.notDeepEqual(a, b, msg) Assert that `a` and `b` do not have the same structure and nested values using [node's deepEqual() algorithm](https://github.com/substack/node-deep-equal) with strict comparisons (`===`) on leaf nodes and an optional description `msg`. Aliases: `t.notEquivalent()`, `t.notDeeply()`, `t.notSame()`, `t.isNotDeepEqual()`, `t.isNotDeeply()`, `t.isNotEquivalent()`, `t.isInequivalent()` ## t.deepLooseEqual(a, b, msg) Assert that `a` and `b` have the same structure and nested values using [node's deepEqual() algorithm](https://github.com/substack/node-deep-equal) with loose comparisons (`==`) on leaf nodes and an optional description `msg`. Aliases: `t.looseEqual()`, `t.looseEquals()` ## t.notDeepLooseEqual(a, b, msg) Assert that `a` and `b` do not have the same structure and nested values using [node's deepEqual() algorithm](https://github.com/substack/node-deep-equal) with loose comparisons (`==`) on leaf nodes and an optional description `msg`. Aliases: `t.notLooseEqual()`, `t.notLooseEquals()` ## t.throws(fn, expected, msg) Assert that the function call `fn()` throws an exception. ## t.doesNotThrow(fn, expected, msg) Assert that the function call `fn()` does not throw an exception. ## t.test(name, cb) Create a subtest with a new test handle `st` from `cb(st)` inside the current test `t`. `cb(st)` will only fire when `t` finishes. Additional tests queued up after `t` will not be run until all subtests finish. ## var htest = test.createHarness() Create a new test harness instance, which is a function like `test()`, but with a new pending stack and test state. By default the TAP output goes to `process.stdout` or `console.log()` if the environment doesn't have `process.stdout`. You can pipe the output to someplace else if you `test.stream.pipe()` to a destination stream on the first tick. ## test.only(name, cb) Like `test(name, cb)` except if you use `.only` this is the only test case that will run for the entire process, all other test cases using tape will be ignored # install With [npm](https://npmjs.org) do: ``` npm install tape ``` # license MIT