navit

Wrapper for Electron to simplify browser tests scripting.

Install

Note, you need to install electron with this package, it is not included as a dependency.

npm install navit electron --save

Examples

const browser = require('./')({ timeout: 30000, engine: 'electron' });

const stack = []; // You can use lazy functions to pass data between stages,
                  // but arrays have more compact notation.

try {
  await browser
    .open('https://dev.nodeca.com')
    .wait(() => {
      try { return window.NodecaLoader.booted; } catch (__) { return false; }
    })
    .get.url(stack)
    .click('forum-category__content:first forum-section__title-link')
    .wait(data => location.url !== data[data.length - 1], stack)
    .test.exists('.forum-topiclines')
    .close();

  console.log('Succeeded');
} catch (err) {
  console.log(err));
}

Also look files in test folder. Those are real examples how to use navit with mocha.

API

1. All methods are chainable.
2. Methods, marked with + have direct aliases without namespace.
3. Chain is then-able. You can apply await anytime, to execute stacked commands.
4. Almost everywhere String & Number params can be defined as functions for lazy evaluation.

Known limitations:

Some methods like .get.evaluate() allow to pass params to evaluated functions. navit uses function's .length property, to properly detect params count, because tailing callbacks are optional. That means, such functions must have explicit parameters list in definition, and you must pass exactly the same params count as defined. We decided, it's not a big price for nice API.

Electron is NOT headless. To run your script in headless environment, you should xvfb.

new Navit(options, engineOpts)

options (not mandatory):

• inject: Array of scripts (file paths) to inject after every page load ([ require.resolve('jquery/dist/jquery') ]).
• timeout: Page load and .wait() timeout, default 5000ms.
• prefix: url prefix for .open() and .post(), default empty string.
• engine: optional, engine driver to use. Only electron is available for now.
• enginePath: optional, direct path to browser engine. Don't use without need, it should be autodetected via electron package.

engineOpts (not mandatory, camelCase):

See https://www.electronjs.org/docs/api/command-line-switches. You can pass any options, supported by browser engine. Option names should be in camelCase.

Actions: .do.*()

Navigation:

• + .do.open(url [, options])
  • options:
  • method - get(default)|post|put|delete|head
  • data
  • headers
• + .do.post(url, data[, options]) - shortcut to .open, for convenience; method is set to post, and data is forwarded to options.data.
• + .do.back()
• + .do.forward()
• + .do.reload()

DOM:

• + .do.click(selector) - click on an element matching selector
• + .do.type(selector, text) - type text into input or contenteditable
• + .do.clear(selector) - clear input value (supports contenteditable)
• + .do.check(selector) - toggles checkbox or radio
• + .do.select(selector, option) - selects an option in dropdown
• + .do.upload(selector, path) - selects a file in input[type="file"]
• + .do.fill(selector, obj [, submit]) - fill out a form (same as fill in CasperJS)
• + .do.scrollTo(top, left) - executes window.scrollTo(top, left)
• + .do.inject([type, ] file) - appends a script or stylesheets from external file to page, type can be one of js or css (default type is js).

Waiting:

• + .do.wait() - wait until page ready; can be useful after click, back and forward actions (open and reload track progress for html pages automatically)
• + .do.wait(delay) - pause for delay milliseconds
• + .do.wait(selector [, timeout]) - wait until selector available
• + .do.wait(fn [, params..., timeout]) - evaluate function in cycle, until returns true.

Get data/params: .get.*()

All functions, passed to .get.*, can be sync (with 1 param) or async (with 2 params). If function returns not falsy type of result (usually a Error) or throws exception, chain will be terminated. That can be used to create complex test conditions.

• + .get.title(fn)
• + .get.url(fn)
• + .get.count(selector, fn)
• + .get.text(selector, fn)
• + .get.html([selector,] fn) - when no selector given, returns full page html.
• + .get.attribute(selector, attribute, fn)
• + .get.value(selector, fn) - for input/selector fields, returns field value.
• .get.evaluate(fnToEval [, params, fn]) - evaluate function on client with optional params. Returned result can be processed on server, if handler set.
• .get.status(fn)
• .get.body(fn)
• .get.headers(fn) - return server reply headers. Note, testing method is not "symmetric" - use .test.header(name, ...).
• .get.cookies(fn) (no pair in .test.*)

Sugar:

1. If you pass Array instead of Function, data will be pushed into it.
2. If fn returns Error object (or anything else not falsy), chain will be stopped with that value.
3. If last param (callback) exists, chain will be finished as with .run method.

Set data/params: .set.*()

• + .set.headers(obj)
• + .set.useragent(string)
• + .set.authentication(user, pass)
• + .set.viewport(width, height)
• + .set.zoom(scale)
• + .set.cookie(obj)
• + .set.cookie(name, value) *If value not passed, cookie will be deleted.

Assertions: .test.*() & test()

Tests available for the most of get.* methods:

• .test.method_name(params..., value [, message)
• If value to compare is RegExp, then data is converted to String, and tested to match provided regexp.
• Negative condition .not can be added to almost any test, before or after method name.

Additional:

• + .test[.not].exists(selector [, message])
• + .test[.not].visible(selector [, message])
• + .test.evaluate(fn [params..., message]) - evaluate & die on any result but true.

Special sugar:

• .test(status_number [, message])
• .test(body_rexexp [, message])
• .test(header_name, string_or_regexp [, message])

Tabs: .tab.*()

• .tab.open([url [, options]]) - create and switch to new tab. Run .do.open(url, options) if url specified
• .tab.count(fn) - get tabs count (if you pass Array, value will be pushed into)
• .tab.switch(index) - switch to tab by index
• .tab.close([index]) - close tab by index or close current tab if index not specified
  • negative index address tab from the tail
  • after all tabs closed, new one will be created automatically

Other

• .fn(function, params) - local function execute. Function can be sync or async (or return Promise). Params count should match function signature.
• .exit() => Promise - tear down browser process. Note, browser will NOT be closed until you do it explicit via this method or .close().
• .close() - similar to .exit() but stackable (will be executed in order with other chained commends).
• .then(onSuccess, onFail) - executes stacked commands.
• .screenshot([ selector|bounding_rect, type,] path) - do screenshot
• .registerMethod(names, fn) - add new method with given name(s) (names can be string or array).
• .use(plugin [, params...]) - apply plugin.

Batches

navit allows record sequence or commands to run it later with one call as many times as you wish.

// create
.batch.create('init_page', function() {
  this.
    .wait(function () {
      try {
        return window.NodecaLoader.booted;
      } catch (__) {}
      return false;
    });
    .viewport(1600, 1200)
    .inject(require.resolve('jquery/dist/jquery'))
    .fn(function () {
      console.log('Batch done.');
    })
})
// run
.batch('init_page')

.afterOpen

If you assign function to this property, it will be called after any .open and .reload definition to stack additional commands. This is experimental feature, that can be changed.

Sometime you may wish to do global setup for all opened pages. For example:

• wait full page init, when it has dynamic scripts loader.
• inject testing scripts from remote host (when you don't like to use global option).

You can record your sequence to batch and automate it's injection after every open / reload. See example how we setup navit in nodeca:

// Wait for nodeca scripts load and check status
//
navit.batch.create('waitNodecaBooted', function () {
  this
    .wait(function () {
      try {
        return window.NodecaLoader.booted;
      } catch (__) {}
      return false;
    })
    .test.status(200);
});

navit.afterOpen = function () {
  this.batch('waitNodecaBooted');
};

Note. .afterOpen is called on chain definition phase, not on execution phase. It's ~ equivalent of typing content manually in test body. That's why it doesn't have callback to wait async operations - it's not needed.

Debug

If you assign environment variable DEBUG to navit, you will see debug message for every action.

Output example for DEBUG=navit mocha:

...
navit do.open('http://localhost:17345/test/fixtures/do/type.html') +25ms
navit do.type('#type-test') +20ms
navit test.evaluate() +9ms
navit do.type('#contenteditable-test') +2ms
navit test.evaluate() +9ms
  ✓ type (64ms)
...