/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* Any copyright is dedicated to the Public Domain.
 http://creativecommons.org/publicdomain/zero/1.0/ */
/* eslint no-unused-vars: [2, {"vars": "local"}] */
/* import-globals-from ../../test/head.js */
"use strict";

// Import the inspector's head.js first (which itself imports shared-head.js).
Services.scriptloader.loadSubScript(
  "chrome://mochitests/content/browser/devtools/client/inspector/test/head.js",
  this);

registerCleanupFunction(() => {
  Services.prefs.clearUserPref("devtools.defaultColorUnit");
});

var {getInplaceEditorForSpan: inplaceEditor} =
  require("devtools/client/shared/inplace-editor");

const ROOT_TEST_DIR = getRootDirectory(gTestPath);
const FRAME_SCRIPT_URL = ROOT_TEST_DIR + "doc_frame_script.js";

registerCleanupFunction(() => {
  Services.prefs.clearUserPref("devtools.defaultColorUnit");
});

/**
 * The rule-view tests rely on a frame-script to be injected in the content test
 * page. So override the shared-head's addTab to load the frame script after the
 * tab was added.
 * FIXME: Refactor the rule-view tests to use the testActor instead of a frame
 * script, so they can run on remote targets too.
 */
var _addTab = addTab;
addTab = function (url) {
  return _addTab(url).then(tab => {
    info("Loading the helper frame script " + FRAME_SCRIPT_URL);
    let browser = tab.linkedBrowser;
    browser.messageManager.loadFrameScript(FRAME_SCRIPT_URL, false);
    return tab;
  });
};

/**
 * Wait for a content -> chrome message on the message manager (the window
 * messagemanager is used).
 *
 * @param {String} name
 *        The message name
 * @return {Promise} A promise that resolves to the response data when the
 * message has been received
 */
function waitForContentMessage(name) {
  info("Expecting message " + name + " from content");

  let mm = gBrowser.selectedBrowser.messageManager;

  let def = promise.defer();
  mm.addMessageListener(name, function onMessage(msg) {
    mm.removeMessageListener(name, onMessage);
    def.resolve(msg.data);
  });
  return def.promise;
}

/**
 * Send an async message to the frame script (chrome -> content) and wait for a
 * response message with the same name (content -> chrome).
 *
 * @param {String} name
 *        The message name. Should be one of the messages defined
 *        in doc_frame_script.js
 * @param {Object} data
 *        Optional data to send along
 * @param {Object} objects
 *        Optional CPOW objects to send along
 * @param {Boolean} expectResponse
 *        If set to false, don't wait for a response with the same name
 *        from the content script. Defaults to true.
 * @return {Promise} Resolves to the response data if a response is expected,
 * immediately resolves otherwise
 */
function executeInContent(name, data = {}, objects = {},
                          expectResponse = true) {
  info("Sending message " + name + " to content");
  let mm = gBrowser.selectedBrowser.messageManager;

  mm.sendAsyncMessage(name, data, objects);
  if (expectResponse) {
    return waitForContentMessage(name);
  }

  return promise.resolve();
}

/**
 * Send an async message to the frame script and get back the requested
 * computed style property.
 *
 * @param {String} selector
 *        The selector used to obtain the element.
 * @param {String} pseudo
 *        pseudo id to query, or null.
 * @param {String} name
 *        name of the property.
 */
function* getComputedStyleProperty(selector, pseudo, propName) {
  return yield executeInContent("Test:GetComputedStylePropertyValue",
                                {selector,
                                pseudo,
                                name: propName});
}

/**
 * Get an element's inline style property value.
 * @param {TestActor} testActor
 * @param {String} selector
 *        The selector used to obtain the element.
 * @param {String} name
 *        name of the property.
 */
function getStyle(testActor, selector, propName) {
  return testActor.eval(`
    content.document.querySelector("${selector}")
                    .style.getPropertyValue("${propName}");
  `);
}

/**
 * Send an async message to the frame script and wait until the requested
 * computed style property has the expected value.
 *
 * @param {String} selector
 *        The selector used to obtain the element.
 * @param {String} pseudo
 *        pseudo id to query, or null.
 * @param {String} prop
 *        name of the property.
 * @param {String} expected
 *        expected value of property
 * @param {String} name
 *        the name used in test message
 */
function* waitForComputedStyleProperty(selector, pseudo, name, expected) {
  return yield executeInContent("Test:WaitForComputedStylePropertyValue",
                                {selector,
                                pseudo,
                                expected,
                                name});
}

/**
 * Given an inplace editable element, click to switch it to edit mode, wait for
 * focus
 *
 * @return a promise that resolves to the inplace-editor element when ready
 */
var focusEditableField = Task.async(function* (ruleView, editable, xOffset = 1,
    yOffset = 1, options = {}) {
  let onFocus = once(editable.parentNode, "focus", true);
  info("Clicking on editable field to turn to edit mode");
  EventUtils.synthesizeMouse(editable, xOffset, yOffset, options,
    editable.ownerDocument.defaultView);
  yield onFocus;

  info("Editable field gained focus, returning the input field now");
  let onEdit = inplaceEditor(editable.ownerDocument.activeElement);

  return onEdit;
});

/**
 * When a tooltip is closed, this ends up "commiting" the value changed within
 * the tooltip (e.g. the color in case of a colorpicker) which, in turn, ends up
 * setting the value of the corresponding css property in the rule-view.
 * Use this function to close the tooltip and make sure the test waits for the
 * ruleview-changed event.
 * @param {Tooltip} tooltip
 * @param {CSSRuleView} view
 */
function* hideTooltipAndWaitForRuleViewChanged(tooltip, view) {
  let onModified = view.once("ruleview-changed");
  tooltip.hide();
  yield onModified;
}

/**
 * Polls a given generator function waiting for it to return true.
 *
 * @param {Function} validatorFn
 *        A validator generator function that returns a boolean.
 *        This is called every few milliseconds to check if the result is true.
 *        When it is true, the promise resolves.
 * @param {String} name
 *        Optional name of the test. This is used to generate
 *        the success and failure messages.
 * @return a promise that resolves when the function returned true or rejects
 * if the timeout is reached
 */
var waitForSuccess = Task.async(function* (validatorFn, desc = "untitled") {
  let i = 0;
  while (true) {
    info("Checking: " + desc);
    if (yield validatorFn()) {
      ok(true, "Success: " + desc);
      break;
    }
    i++;
    if (i > 10) {
      ok(false, "Failure: " + desc);
      break;
    }
    yield new Promise(r => setTimeout(r, 200));
  }
});

/**
 * Get the DOMNode for a css rule in the rule-view that corresponds to the given
 * selector
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} selectorText
 *        The selector in the rule-view for which the rule
 *        object is wanted
 * @return {DOMNode}
 */
function getRuleViewRule(view, selectorText) {
  let rule;
  for (let r of view.styleDocument.querySelectorAll(".ruleview-rule")) {
    let selector = r.querySelector(".ruleview-selectorcontainer, " +
                                   ".ruleview-selector-matched");
    if (selector && selector.textContent === selectorText) {
      rule = r;
      break;
    }
  }

  return rule;
}

/**
 * Get references to the name and value span nodes corresponding to a given
 * selector and property name in the rule-view
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} selectorText
 *        The selector in the rule-view to look for the property in
 * @param {String} propertyName
 *        The name of the property
 * @return {Object} An object like {nameSpan: DOMNode, valueSpan: DOMNode}
 */
function getRuleViewProperty(view, selectorText, propertyName) {
  let prop;

  let rule = getRuleViewRule(view, selectorText);
  if (rule) {
    // Look for the propertyName in that rule element
    for (let p of rule.querySelectorAll(".ruleview-property")) {
      let nameSpan = p.querySelector(".ruleview-propertyname");
      let valueSpan = p.querySelector(".ruleview-propertyvalue");

      if (nameSpan.textContent === propertyName) {
        prop = {nameSpan: nameSpan, valueSpan: valueSpan};
        break;
      }
    }
  }
  return prop;
}

/**
 * Get the text value of the property corresponding to a given selector and name
 * in the rule-view
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} selectorText
 *        The selector in the rule-view to look for the property in
 * @param {String} propertyName
 *        The name of the property
 * @return {String} The property value
 */
function getRuleViewPropertyValue(view, selectorText, propertyName) {
  return getRuleViewProperty(view, selectorText, propertyName)
    .valueSpan.textContent;
}

/**
 * Get a reference to the selector DOM element corresponding to a given selector
 * in the rule-view
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} selectorText
 *        The selector in the rule-view to look for
 * @return {DOMNode} The selector DOM element
 */
function getRuleViewSelector(view, selectorText) {
  let rule = getRuleViewRule(view, selectorText);
  return rule.querySelector(".ruleview-selector, .ruleview-selector-matched");
}

/**
 * Get a reference to the selectorhighlighter icon DOM element corresponding to
 * a given selector in the rule-view
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} selectorText
 *        The selector in the rule-view to look for
 * @return {DOMNode} The selectorhighlighter icon DOM element
 */
function getRuleViewSelectorHighlighterIcon(view, selectorText) {
  let rule = getRuleViewRule(view, selectorText);
  return rule.querySelector(".ruleview-selectorhighlighter");
}

/**
 * Simulate a color change in a given color picker tooltip, and optionally wait
 * for a given element in the page to have its style changed as a result.
 * Note that this function assumes that the colorpicker popup is already open
 * and it won't close it after having selected the new color.
 *
 * @param {RuleView} ruleView
 *        The related rule view instance
 * @param {SwatchColorPickerTooltip} colorPicker
 * @param {Array} newRgba
 *        The new color to be set [r, g, b, a]
 * @param {Object} expectedChange
 *        Optional object that needs the following props:
 *          - {String} selector The selector to the element in the page that
 *            will have its style changed.
 *          - {String} name The style name that will be changed
 *          - {String} value The expected style value
 * The style will be checked like so: getComputedStyle(element)[name] === value
 */
var simulateColorPickerChange = Task.async(function* (ruleView, colorPicker,
    newRgba, expectedChange) {
  let onRuleViewChanged = ruleView.once("ruleview-changed");
  info("Getting the spectrum colorpicker object");
  let spectrum = yield colorPicker.spectrum;
  info("Setting the new color");
  spectrum.rgb = newRgba;
  info("Applying the change");
  spectrum.updateUI();
  spectrum.onChange();
  info("Waiting for rule-view to update");
  yield onRuleViewChanged;

  if (expectedChange) {
    info("Waiting for the style to be applied on the page");
    let {selector, name, value} = expectedChange;
    yield waitForComputedStyleProperty(selector, null, name, value);
  }
});

/**
 * Open the color picker popup for a given property in a given rule and
 * simulate a color change. Optionally wait for a given element in the page to
 * have its style changed as a result.
 *
 * @param {RuleView} view
 *        The related rule view instance
 * @param {Number} ruleIndex
 *        Which rule to target in the rule view
 * @param {Number} propIndex
 *        Which property to target in the rule
 * @param {Array} newRgba
 *        The new color to be set [r, g, b, a]
 * @param {Object} expectedChange
 *        Optional object that needs the following props:
 *          - {String} selector The selector to the element in the page that
 *            will have its style changed.
 *          - {String} name The style name that will be changed
 *          - {String} value The expected style value
 * The style will be checked like so: getComputedStyle(element)[name] === value
 */
var openColorPickerAndSelectColor = Task.async(function* (view, ruleIndex,
    propIndex, newRgba, expectedChange) {
  let ruleEditor = getRuleViewRuleEditor(view, ruleIndex);
  let propEditor = ruleEditor.rule.textProps[propIndex].editor;
  let swatch = propEditor.valueSpan.querySelector(".ruleview-colorswatch");
  let cPicker = view.tooltips.colorPicker;

  info("Opening the colorpicker by clicking the color swatch");
  let onShown = cPicker.tooltip.once("shown");
  swatch.click();
  yield onShown;

  yield simulateColorPickerChange(view, cPicker, newRgba, expectedChange);

  return {propEditor, swatch, cPicker};
});

/**
 * Open the cubicbezier popup for a given property in a given rule and
 * simulate a curve change. Optionally wait for a given element in the page to
 * have its style changed as a result.
 *
 * @param {RuleView} view
 *        The related rule view instance
 * @param {Number} ruleIndex
 *        Which rule to target in the rule view
 * @param {Number} propIndex
 *        Which property to target in the rule
 * @param {Array} coords
 *        The new coordinates to be used, e.g. [0.1, 2, 0.9, -1]
 * @param {Object} expectedChange
 *        Optional object that needs the following props:
 *          - {String} selector The selector to the element in the page that
 *            will have its style changed.
 *          - {String} name The style name that will be changed
 *          - {String} value The expected style value
 * The style will be checked like so: getComputedStyle(element)[name] === value
 */
var openCubicBezierAndChangeCoords = Task.async(function* (view, ruleIndex,
    propIndex, coords, expectedChange) {
  let ruleEditor = getRuleViewRuleEditor(view, ruleIndex);
  let propEditor = ruleEditor.rule.textProps[propIndex].editor;
  let swatch = propEditor.valueSpan.querySelector(".ruleview-bezierswatch");
  let bezierTooltip = view.tooltips.cubicBezier;

  info("Opening the cubicBezier by clicking the swatch");
  let onShown = bezierTooltip.tooltip.once("shown");
  swatch.click();
  yield onShown;

  let widget = yield bezierTooltip.widget;

  info("Simulating a change of curve in the widget");
  let onRuleViewChanged = view.once("ruleview-changed");
  widget.coordinates = coords;
  yield onRuleViewChanged;

  if (expectedChange) {
    info("Waiting for the style to be applied on the page");
    let {selector, name, value} = expectedChange;
    yield waitForComputedStyleProperty(selector, null, name, value);
  }

  return {propEditor, swatch, bezierTooltip};
});

/**
 * Get a rule-link from the rule-view given its index
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {Number} index
 *        The index of the link to get
 * @return {DOMNode} The link if any at this index
 */
function getRuleViewLinkByIndex(view, index) {
  let links = view.styleDocument.querySelectorAll(".ruleview-rule-source");
  return links[index];
}

/**
 * Get rule-link text from the rule-view given its index
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {Number} index
 *        The index of the link to get
 * @return {String} The string at this index
 */
function getRuleViewLinkTextByIndex(view, index) {
  let link = getRuleViewLinkByIndex(view, index);
  return link.querySelector(".ruleview-rule-source-label").value;
}

/**
 * Get the rule editor from the rule-view given its index
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {Number} childrenIndex
 *        The children index of the element to get
 * @param {Number} nodeIndex
 *        The child node index of the element to get
 * @return {DOMNode} The rule editor if any at this index
 */
function getRuleViewRuleEditor(view, childrenIndex, nodeIndex) {
  return nodeIndex !== undefined ?
    view.element.children[childrenIndex].childNodes[nodeIndex]._ruleEditor :
    view.element.children[childrenIndex]._ruleEditor;
}

/**
 * Simulate adding a new property in an existing rule in the rule-view.
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {Number} ruleIndex
 *        The index of the rule to use. Note that if ruleIndex is 0, you might
 *        want to also listen to markupmutation events in your test since
 *        that's going to change the style attribute of the selected node.
 * @param {String} name
 *        The name for the new property
 * @param {String} value
 *        The value for the new property
 * @param {String} commitValueWith
 *        Which key should be used to commit the new value. VK_RETURN is used by
 *        default, but tests might want to use another key to test cancelling
 *        for exemple.
 * @param {Boolean} blurNewProperty
 *        After the new value has been added, a new property would have been
 *        focused. This parameter is true by default, and that causes the new
 *        property to be blurred. Set to false if you don't want this.
 * @return {TextProperty} The instance of the TextProperty that was added
 */
var addProperty = Task.async(function* (view, ruleIndex, name, value,
                                        commitValueWith = "VK_RETURN",
                                        blurNewProperty = true) {
  info("Adding new property " + name + ":" + value + " to rule " + ruleIndex);

  let ruleEditor = getRuleViewRuleEditor(view, ruleIndex);
  let editor = yield focusNewRuleViewProperty(ruleEditor);
  let numOfProps = ruleEditor.rule.textProps.length;

  info("Adding name " + name);
  editor.input.value = name;
  let onNameAdded = view.once("ruleview-changed");
  EventUtils.synthesizeKey("VK_RETURN", {}, view.styleWindow);
  yield onNameAdded;

  // Focus has moved to the value inplace-editor automatically.
  editor = inplaceEditor(view.styleDocument.activeElement);
  let textProps = ruleEditor.rule.textProps;
  let textProp = textProps[textProps.length - 1];

  is(ruleEditor.rule.textProps.length, numOfProps + 1,
     "A new test property was added");
  is(editor, inplaceEditor(textProp.editor.valueSpan),
     "The inplace editor appeared for the value");

  info("Adding value " + value);
  // Setting the input value schedules a preview to be shown in 10ms which
  // triggers a ruleview-changed event (see bug 1209295).
  let onPreview = view.once("ruleview-changed");
  editor.input.value = value;
  yield onPreview;

  let onValueAdded = view.once("ruleview-changed");
  EventUtils.synthesizeKey(commitValueWith, {}, view.styleWindow);
  yield onValueAdded;

  if (blurNewProperty) {
    view.styleDocument.activeElement.blur();
  }

  return textProp;
});

/**
 * Simulate changing the value of a property in a rule in the rule-view.
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {TextProperty} textProp
 *        The instance of the TextProperty to be changed
 * @param {String} value
 *        The new value to be used. If null is passed, then the value will be
 *        deleted
 * @param {Boolean} blurNewProperty
 *        After the value has been changed, a new property would have been
 *        focused. This parameter is true by default, and that causes the new
 *        property to be blurred. Set to false if you don't want this.
 */
var setProperty = Task.async(function* (view, textProp, value,
                                        blurNewProperty = true) {
  yield focusEditableField(view, textProp.editor.valueSpan);

  let onPreview = view.once("ruleview-changed");
  if (value === null) {
    EventUtils.synthesizeKey("VK_DELETE", {}, view.styleWindow);
  } else {
    EventUtils.sendString(value, view.styleWindow);
  }
  yield onPreview;

  let onValueDone = view.once("ruleview-changed");
  EventUtils.synthesizeKey("VK_RETURN", {}, view.styleWindow);
  yield onValueDone;

  if (blurNewProperty) {
    view.styleDocument.activeElement.blur();
  }
});

/**
 * Simulate removing a property from an existing rule in the rule-view.
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {TextProperty} textProp
 *        The instance of the TextProperty to be removed
 * @param {Boolean} blurNewProperty
 *        After the property has been removed, a new property would have been
 *        focused. This parameter is true by default, and that causes the new
 *        property to be blurred. Set to false if you don't want this.
 */
var removeProperty = Task.async(function* (view, textProp,
                                           blurNewProperty = true) {
  yield focusEditableField(view, textProp.editor.nameSpan);

  let onModifications = view.once("ruleview-changed");
  info("Deleting the property name now");
  EventUtils.synthesizeKey("VK_DELETE", {}, view.styleWindow);
  EventUtils.synthesizeKey("VK_RETURN", {}, view.styleWindow);
  yield onModifications;

  if (blurNewProperty) {
    view.styleDocument.activeElement.blur();
  }
});

/**
 * Simulate clicking the enable/disable checkbox next to a property in a rule.
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {TextProperty} textProp
 *        The instance of the TextProperty to be enabled/disabled
 */
var togglePropStatus = Task.async(function* (view, textProp) {
  let onRuleViewRefreshed = view.once("ruleview-changed");
  textProp.editor.enable.click();
  yield onRuleViewRefreshed;
});

/**
 * Click on a rule-view's close brace to focus a new property name editor
 *
 * @param {RuleEditor} ruleEditor
 *        An instance of RuleEditor that will receive the new property
 * @return a promise that resolves to the newly created editor when ready and
 * focused
 */
var focusNewRuleViewProperty = Task.async(function* (ruleEditor) {
  info("Clicking on a close ruleEditor brace to start editing a new property");
  ruleEditor.closeBrace.scrollIntoView();
  let editor = yield focusEditableField(ruleEditor.ruleView,
    ruleEditor.closeBrace);

  is(inplaceEditor(ruleEditor.newPropSpan), editor,
    "Focused editor is the new property editor.");

  return editor;
});

/**
 * Create a new property name in the rule-view, focusing a new property editor
 * by clicking on the close brace, and then entering the given text.
 * Keep in mind that the rule-view knows how to handle strings with multiple
 * properties, so the input text may be like: "p1:v1;p2:v2;p3:v3".
 *
 * @param {RuleEditor} ruleEditor
 *        The instance of RuleEditor that will receive the new property(ies)
 * @param {String} inputValue
 *        The text to be entered in the new property name field
 * @return a promise that resolves when the new property name has been entered
 * and once the value field is focused
 */
var createNewRuleViewProperty = Task.async(function* (ruleEditor, inputValue) {
  info("Creating a new property editor");
  let editor = yield focusNewRuleViewProperty(ruleEditor);

  info("Entering the value " + inputValue);
  editor.input.value = inputValue;

  info("Submitting the new value and waiting for value field focus");
  let onFocus = once(ruleEditor.element, "focus", true);
  EventUtils.synthesizeKey("VK_RETURN", {},
    ruleEditor.element.ownerDocument.defaultView);
  yield onFocus;
});

/**
 * Set the search value for the rule-view filter styles search box.
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} searchValue
 *        The filter search value
 * @return a promise that resolves when the rule-view is filtered for the
 * search term
 */
var setSearchFilter = Task.async(function* (view, searchValue) {
  info("Setting filter text to \"" + searchValue + "\"");
  let win = view.styleWindow;
  let searchField = view.searchField;
  searchField.focus();
  synthesizeKeys(searchValue, win);
  yield view.inspector.once("ruleview-filtered");
});

/**
 * Reload the current page and wait for the inspector to be initialized after
 * the navigation
 *
 * @param {InspectorPanel} inspector
 *        The instance of InspectorPanel currently loaded in the toolbox
 * @param {TestActor} testActor
 *        The current instance of the TestActor
 */
function* reloadPage(inspector, testActor) {
  let onNewRoot = inspector.once("new-root");
  yield testActor.reload();
  yield onNewRoot;
  yield inspector.markup._waitForChildren();
}

/**
 * Create a new rule by clicking on the "add rule" button.
 * This will leave the selector inplace-editor active.
 *
 * @param {InspectorPanel} inspector
 *        The instance of InspectorPanel currently loaded in the toolbox
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @return a promise that resolves after the rule has been added
 */
function* addNewRule(inspector, view) {
  info("Adding the new rule using the button");
  view.addRuleButton.click();

  info("Waiting for rule view to change");
  yield view.once("ruleview-changed");
}

/**
 * Create a new rule by clicking on the "add rule" button, dismiss the editor field and
 * verify that the selector is correct.
 *
 * @param {InspectorPanel} inspector
 *        The instance of InspectorPanel currently loaded in the toolbox
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {String} expectedSelector
 *        The value we expect the selector to have
 * @param {Number} expectedIndex
 *        The index we expect the rule to have in the rule-view
 * @return a promise that resolves after the rule has been added
 */
function* addNewRuleAndDismissEditor(inspector, view, expectedSelector, expectedIndex) {
  yield addNewRule(inspector, view);

  info("Getting the new rule at index " + expectedIndex);
  let ruleEditor = getRuleViewRuleEditor(view, expectedIndex);
  let editor = ruleEditor.selectorText.ownerDocument.activeElement;
  is(editor.value, expectedSelector,
     "The editor for the new selector has the correct value: " + expectedSelector);

  info("Pressing escape to leave the editor");
  EventUtils.synthesizeKey("VK_ESCAPE", {});

  is(ruleEditor.selectorText.textContent, expectedSelector,
     "The new selector has the correct text: " + expectedSelector);
}

/**
 * Simulate a sequence of non-character keys (return, escape, tab) and wait for
 * a given element to receive the focus.
 *
 * @param {CssRuleView} view
 *        The instance of the rule-view panel
 * @param {DOMNode} element
 *        The element that should be focused
 * @param {Array} keys
 *        Array of non-character keys, the part that comes after "DOM_VK_" eg.
 *        "RETURN", "ESCAPE"
 * @return a promise that resolves after the element received the focus
 */
function* sendKeysAndWaitForFocus(view, element, keys) {
  let onFocus = once(element, "focus", true);
  for (let key of keys) {
    EventUtils.sendKey(key, view.styleWindow);
  }
  yield onFocus;
}
