DevTools: Convert inspector-unit tests to use reusable test harness

third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt-hint.js

+TestRunner.addResult("Tests that the hint displays properly on a UI.TextPrompt with autocomplete.");
+
+var suggestions = [{title:"testTextPrompt"}];
+var waitingForAutocomplete = null;
+var completionsDone = function () {
+    console.error("completionsDone called too early!");
+    TestRunner.completeTest();
+}
+var prompt = new UI.TextPrompt();
+prompt.initialize(completions);
+var element = createElement("div");
+UI.inspectorView.element.appendChild(element);
+var proxy = prompt.attachAndStartEditing(element);
+prompt.setText("testT");
+waitForAutocomplete().then(step1);
+prompt.complete();
+dumpTextPrompt();
+
+function step1() {
+    dumpTextPrompt();
+
+    typeCharacter("e");
+    dumpTextPrompt();
+
+    waitForAutocomplete().then(step2);
+}
+function step2()
+{
+    dumpTextPrompt();
+
+    typeCharacter("z");
+    waitForAutocomplete().then(step3);
+}
+
+function step3()
+{
+    dumpTextPrompt();
+    typeCharacter(null);
+    waitForAutocomplete().then(step4);
+}
+
+function step4()
+{
+    dumpTextPrompt();
+    typeCharacter(null);
+    waitForAutocomplete().then(step5);
+}
+function step5()
+{
+    dumpTextPrompt();
+    prompt.setText("something_before test");
+    prompt.complete();
+    completionsDone().then(()=>{
+        dumpTextPrompt();
+        typeCharacter("T");
+        dumpTextPrompt();
+        TestRunner.completeTest();
+    });
+}
+
+function completions(expression, query)
+{
+    var callback;
+    var promise = new Promise(x => callback = x);
+    TestRunner.addResult("Requesting completions");
+    completionsDone = () => {
+        callback(suggestions.filter(s => s.title.startsWith(query.toString())))
+        return Promise.resolve();
+    };
+    var temp = waitingForAutocomplete;
+    waitingForAutocomplete = null;
+    if (temp)
+        temp();
+    return promise;
+}
+
+function waitForAutocomplete()
+{
+    return new Promise(x => waitingForAutocomplete = x).then(() => completionsDone());
+}
+
+function dumpTextPrompt()
+{
+    TestRunner.addResult("Text:" + prompt.text());
+    TestRunner.addResult("TextWithCurrentSuggestion:" + prompt.textWithCurrentSuggestion());
+    TestRunner.addResult("");
+}
+
+function typeCharacter(character)
+{
+    var keyboardEvent = new KeyboardEvent("keydown", {
+        key: character || "Backspace",
+        charCode: character ? character.charCodeAt(0) : ""
+    });
+    element.dispatchEvent(keyboardEvent);
+
+    var selection = element.getComponentSelection();
+    var range = selection.getRangeAt(0);
+    var textNode = prompt._ghostTextElement.parentNode ? prompt._ghostTextElement.previousSibling : element.childTextNodes()[element.childTextNodes().length - 1];
+    if (!character)
+        textNode.textContent = textNode.textContent.substring(0,textNode.textContent.length-1);
+    else
+        textNode.textContent += character;
+    range.setStart(range.startContainer, range.startContainer.textContent.length);
+    selection.removeAllRanges();
+    selection.addRange(range);
+    element.dispatchEvent(new Event("input", {bubbles: true, cancelable: false}));
+}