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Writing Gemini tests

For each block of website that will be tested you need to write one or more test suites. Suite consists of few states that need to be verified. For each state you need to specify action sequence that gets block to this state.

Defining suites

Test suite is defined with gemini.suite method.

Example:

gemini.suite('button', function(suite) {
    suite
        .setUrl('/path/to/page')
        .setCaptureElements('.button')
        .before(function(actions, find) {
            this.button = find('.buttons');
        })
        .capture('plain')
        .capture('hovered', function(actions, find) {
            actions.mouseMove(this.button);
        })
        .capture('pressed', function(actions, find) {
            actions.mouseDown(this.button);
        })
        .capture('clicked', function(actions, find) {
            actions.mouseUp(this.button);
        });
});

Arguments of a gemini.suite:

  • name — the name of the new test suite. Name is displayed in reports and affects screenshots filenames. Important Name of test suite can not be empty.

  • callback(suite) — callback, used to set up the suite. Receives a suite builder instance (described below).

Suite builder methods

All methods are chainable:

  • setUrl(url) — specifies address of a web page to take screenshots from. URL is relative to rootUrl config field.

  • setCaptureElements('selector1', 'selector2', ...}) — specifies CSS selectors of the elements that will be used to determine a region of a web page to capture.

    Capture region is determined by minimum bounding rect for all of the elements plus their box-shadow size.

    Can also accept an array:

    suite.setCaptureElements(['.selector1', '.selector2']);

    All tests in a suite will fail if none of the elements will be found.

  • ignoreElements('.selector1', {every: '.selector2'}, ...) — elements, matching specified selectors will be ignored when comparing images.

    • .selector1 — Ignore only the first matched element.
    • {every: '.selector2'} — Ignore all matched elements.

  • setTolerance(value) — overrides global tolerance value for the whole suite (See toleranceoption description in config documentation for details).

  • skip([browser]) — skip all tests and nested suites for:

    • skip() — all browsers;

    • skip('id') — browser with specified id;

    • skip('id', comment) — browser with specified id and show comment in the report;

    • skip(/some RegExp/) — browser with id which matches /some RegExp/;

    • skip(/some RegExp/, comment) — browser with id which matches /some RegExp/ and show comment in the report;

    • skip(['id1', /RegExp1/, ...]) — multiple browsers;

    • skip(['id1', /RegExp1/, ...], comment) — multiple browsers and show comment in the report.

    All browsers from subsequent calls to .skip() are added to the skip list:

    suite
    .skip('id1')
    .skip(/RegExp1/);

    is equivalent to

    suite.skip([
    'id1',
    /RegExp1/
]);

  • browsers([browser]) — run all tests and nested suites in specified browsers:

    • browsers('id') — browser with specified id;

    • browsers(/some RegExp/) — browser id which matches /some RegExp/;

    • browsers(['id1', /RegExp1/, ...]) — multiple browsers.

  • capture(stateName, [options], callback(actions, find)) — defines a new state to capture. Optional callback describes a sequence of actions to bring the page to this state, starting from a previous state of the suite. States are executed one after another in order of definition without browser reload in between.

    Callback accepts two arguments:

    • actions — chainable object that should be used to specify a series of actions to perform.

    • find(selector) — use this function to search for an element to act on. Search is lazy and actually will be performed the first time element is needed. Search will be performed once for each find call, so if you need to perform multiple actions on the same element, save the result to some variable:

      .capture('name', function(actions, find) {
    var button = find('.button');
    actions.mouseDown(button)
        .mouseUp(button);
});

    Options parameter allows you to override a tolerance value for one test:

    .capture('name', {tolerance: 30}, function(actions, find) {

});

    See toleranceoption description in config documentation for details.

  • before(callback(actions, find)) — use this function to execute some code before the first state. The arguments of a callback are the same as for capture callback. Context is shared between before callback and all of suite's state callbacks, so you can use this hook to lookup for an element only once for the whole suite:

    suite
    .before(function(actions, find) {
        this.button = find('.buttons');
    })
    .capture('hovered', function(actions, find) {
        actions.mouseMove(this.button);
    })
    .capture('pressed', function(actions, find) {
        actions.mouseDown(this.button);
    });

  • after(callback(actions, find)) — use this function to execute some code after the last state. The arguments of a callback are the same as for capture and before callbacks and context is shared between all of them.

Nested suites

Suites can be nested. In this case, inner suite inherits url, captureElements from outer. This properties can be overridden in inner suites without affecting the outer. Each new suite causes reload of the browser, even if URL was not changed.

gemini.suite('parent', function(parent) {
    parent.setUrl('/some/path')
        .setCaptureElements('.selector1', '.selector2');
        .capture('state');

    gemini.suite('first child', function(child) {
        //this suite captures same elements on different pages
        child.setUrl('/other/path')
            .capture('other state');
    });

    gemini.suite('second child', function(child) {
        //this suite captures different elements on the same page
        child.setCaptureElements('.next-selector')
            .capture('third state', function(actions, elements) {
                // ...
            })

        gemini.suite('grandchild', function(grandchild) {
            //child suites can have own childs
            grandchild.capture('fourth state');

        });
    });

    gemini.suite('third child', function(child) {
        //this suite uses completely different URL and set of elements
        child.setUrl('/some/another/path')
            .setCaptureElements('.different-selector');
            .capture('fifth state');
    });
});

Available actions

By calling methods of the actions argument of a callback you can program a series of steps to bring the block to desired state. All calls are chainable and next step is always executed after previous one has completed. In the following list element can be either CSS selector or result of a find call:

  • click(element) — mouse click at the center of the element.

  • doubleClick(element) — mouse double click at the center of the element.

  • mouseDown(element, [button]) — press a mouse button at the center of the element. Possible button values are: 0 — left, 1 — middle, 2 — right. By default, left button is used.

  • mouseUp([element], [button]) — release previously pressed mouse button. If element is specified, move mouse to element and release then.

  • mouseMove(element, [offset]) — move mouse to the given element. Offset is specified relatively to the top left corner of the element. If not specified, mouse will be moved to the center of the element.

  • dragAndDrop(element, dragTo) — drag element to other dragTo element.

  • flick(speed, swipe) — flick starting anywhere on the screen using speed.x and speed.y speed.

  • flick(offsets, speed, element) — flick element with starting point at its center by offsets.x and offset.y offsets.

  • executeJS(function(window)) — run specified function in a browser. The argument of a function is the browser's window object:

    actions.executeJS(function(window) {
    window.alert('Hello!');
});

    Note that function is executed in a browser context, so any references to outer scope of callback won't work.

    ⚠️ window.scrollTo does not work in [email protected] (see details).

  • wait(milliseconds) — wait for specified amount of time before next action. If it is the last action in sequence, delay the screenshot for this amount of time.

  • waitForElementToShow(selector, [timeout]) — waits until element, matched by selector will become visible. Fails if element does not appear after timeout milliseconds (1000 by default).

  • waitForElementToHide(selector, [timeout]) — waits until element, matched by selector will become invisible or will be completely removed from DOM. Fails if element still visible after timeout milliseconds (1000 by default).

  • waitForJSCondition(function(window), timeout) — waits until specified function return true. Function will be executed in browser context, so any references to outer scope won't work. Fails if after timeout milliseconds function still returns false (1000 by default).

  • sendKeys([element], keys) — send a series of keyboard strokes to the specified element or currently active element on a page.

    You can send a special key using one of the provided constants, i.e:

    actions.sendKeys(gemini.ARROW_DOWN);

Full list of special keys (there are shortcuts for commonly used keys):

NULL, CANCEL, HELP, BACK_SPACE, TAB, CLEAR, RETURN, ENTER, LEFT_SHIFT ⇔ SHIFT, LEFT_CONTROL ⇔ CONTROL, LEFT_ALT ⇔ ALT, PAUSE, ESCAPE, SPACE, PAGE_UP, PAGE_DOWN, END, HOME, ARROW_LEFT ⇔ LEFT, ARROW_UP ⇔ UP, ARROW_RIGHT ⇔ RIGHT, ARROW_DOWN ⇔ DOWN, INSERT, DELETE, SEMICOLON, EQUALS, NUMPAD0, NUMPAD1, NUMPAD2, NUMPAD3, NUMPAD4, NUMPAD5, NUMPAD6, NUMPAD7, NUMPAD8, NUMPAD9, MULTIPLY, ADD, SEPARATOR, SUBTRACT, DECIMAL, DIVIDE, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, COMMAND ⇔ META, ZENKAKU_HANKAKU.

  • sendFile(element, path) — send file to the specified input[type=file] element. path must exist at local system (the one which gemini is executed on).

  • focus(element) — set a focus to a specified element.

  • setWindowSize(width, height) — change browser window dimensions. ⚠️ You can't set specific resolutions for browser Opera or mobile platforms. They use only full-screen resolution.

  • tap(element) — tap specified element on touch enabled device.

  • changeOrientation() — change orientation on touch enabled device (from PORTRAIT to LANDSCAPE and vice versa). ⚠️ Does not work on mobile emulation.

Passing a context to tests

Add system.ctx field to your configuration file:

module.exports = {
    // ...
    system: {
        ctx: {
            foo: 'bar'
        }
    }
};

ctx will be available in tests via gemini.ctx method:

console.log(gemini.ctx); // {foo: 'bar'}

Recommendation: use ctx in your tests in favor of global variables.