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diff --git a/toolkit/components/prompts/test/test_modal_select.html b/toolkit/components/prompts/test/test_modal_select.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Modal Prompts Test</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script type="text/javascript" src="prompt_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+Prompter tests: modal prompts
+<p id="display"></p>
+
+<div id="content" style="display: none">
+  <iframe id="iframe"></iframe>
+</div>
+
+<pre id="test">
+<script class="testbody" type="text/javascript;version=1.8">
+
+let prompter = Cc["@mozilla.org/embedcomp/prompt-service;1"].
+               getService(Ci.nsIPromptService2);
+
+function checkPromptState(promptState, expectedState) {
+    // XXX check title? OS X has title in content
+    // XXX check focused element
+    // XXX check button labels?
+
+    is(promptState.msg, expectedState.msg, "Checking expected message");
+
+    // Compare listbox contents
+    is(promptState.items.length, expectedState.items.length, "Checking listbox length");
+
+    if (promptState.items.length)
+      is(promptState.selectedIndex, 0, "Checking selected index");
+
+    for (let i = 0; i < promptState.items; i++) {
+        is(promptState.items[i], expectedState.items[i], "Checking list item #" + i);
+    }
+}
+
+let selectVal = {};
+let isOK;
+let state, action;
+
+function handlePrompt(state, action) {
+  return new Promise(resolve => {
+    gChromeScript.addMessageListener("promptHandled", function handled(msg) {
+      gChromeScript.removeMessageListener("promptHandled", handled);
+      checkPromptState(msg.promptState, state);
+      resolve(true);
+    });
+    gChromeScript.sendAsyncMessage("handlePrompt", { action: action, isSelect: true});
+  });
+}
+
+
+// =====
+add_task(function* test_select_empty_list() {
+    info("Starting test: Select (0 items, ok)");
+    state = {
+        msg   : "This is the select text.",
+        title : "TestTitle",
+        items : [],
+    };
+    action = {
+        buttonClick: "ok",
+    };
+    promptDone = handlePrompt(state, action);
+    items = [];
+    selectVal.value = null; // outparam, just making sure.
+    isOK = prompter.select(window, "TestTitle", "This is the select text.", items.length, items, selectVal);
+    is(isOK, true, "checked expected retval");
+    is(selectVal.value, -1, "checking selected index");
+
+    yield promptDone;
+});
+
+// =====
+add_task(function* test_select_ok() {
+    info("Starting test: Select (3 items, ok)");
+    state = {
+        msg   : "This is the select text.",
+        title : "TestTitle",
+        items : ["one", "two", "three"],
+    };
+    action = {
+        buttonClick: "ok",
+    };
+    promptDone = handlePrompt(state, action);
+    items = ["one", "two", "three"];
+    selectVal.value = null; // outparam, just making sure.
+    isOK = prompter.select(window, "TestTitle", "This is the select text.", items.length, items, selectVal);
+    is(isOK, true, "checked expected retval");
+    is(selectVal.value, 0, "checking selected index");
+
+    yield promptDone;
+});
+
+// =====
+add_task(function* test_select_item() {
+    info("Starting test: Select (3 items, selection changed, ok)");
+    state = {
+        msg   : "This is the select text.",
+        title : "TestTitle",
+        items : ["one", "two", "three"],
+    };
+    action = {
+        buttonClick: "ok",
+        selectItem: 1,
+    };
+    promptDone = handlePrompt(state, action);
+    items = ["one", "two", "three"];
+    selectVal.value = null; // outparam, just making sure.
+    isOK = prompter.select(window, "TestTitle", "This is the select text.", items.length, items, selectVal);
+    is(isOK, true, "checked expected retval");
+    is(selectVal.value, 1, "checking selected index");
+
+    yield promptDone;
+});
+
+// =====
+add_task(function* test_cancel_prompt() {
+    info("Starting test: Select (3 items, cancel)");
+    state = {
+        msg   : "This is the select text.",
+        title : "TestTitle",
+        items : ["one", "two", "three"],
+    };
+    action = {
+        buttonClick: "cancel",
+    };
+    promptDone = handlePrompt(state, action);
+    items = ["one", "two", "three"];
+    selectVal.value = null; // outparam, just making sure.
+    isOK = prompter.select(window, "TestTitle", "This is the select text.", items.length, items, selectVal);
+    is(isOK, false, "checked expected retval");
+    is(selectVal.value, 0, "checking selected index");
+
+    yield promptDone;
+});
+
+</script>
+</pre>
+</body>
+</html>