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diff --git a/devtools/client/shared/components/test/mochitest/test_reps_long-string.html b/devtools/client/shared/components/test/mochitest/test_reps_long-string.html
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+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<!DOCTYPE HTML>
+<html>
+<!--
+Test LongString rep
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Rep test - LongString</title>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+<body>
+<pre id="test">
+<script src="head.js" type="application/javascript;version=1.8"></script>
+<script type="application/javascript;version=1.8">
+window.onload = Task.async(function* () {
+  let { Rep } = browserRequire("devtools/client/shared/components/reps/rep");
+  let { LongStringRep } = browserRequire("devtools/client/shared/components/reps/long-string");
+
+  try {
+    // Test that correct rep is chosen
+    const renderedRep = shallowRenderComponent(Rep, { object: getGripStub("testMultiline") });
+    is(renderedRep.type, LongStringRep.rep,
+      `Rep correctly selects ${LongStringRep.rep.displayName}`);
+
+    // Test rendering
+    yield testMultiline();
+    yield testMultilineOpen();
+    yield testFullText();
+    yield testMultilineLimit();
+    yield testUseQuotes();
+  } catch (e) {
+    ok(false, "Got an error: " + DevToolsUtils.safeErrorString(e));
+  } finally {
+    SimpleTest.finish();
+  }
+
+  function testMultiline() {
+    const stub = getGripStub("testMultiline");
+    const renderedComponent = renderComponent(
+      LongStringRep.rep, { object: stub });
+
+    is(renderedComponent.textContent, `"${stub.initial}…"`,
+      "LongString rep has expected text content for multiline string");
+  }
+
+  function testMultilineLimit() {
+    const renderedComponent = renderComponent(
+      LongStringRep.rep, { object: getGripStub("testMultiline"), cropLimit: 20 });
+
+    is(
+      renderedComponent.textContent,
+      `"a\naaaaaaaaaaaaaaaaaa…"`,
+      "LongString rep has expected text content for multiline string " +
+      "with specified number of characters");
+  }
+
+  function testMultilineOpen() {
+    const stub = getGripStub("testMultiline");
+    const renderedComponent = renderComponent(
+      LongStringRep.rep, { object: stub, member: {open: true}, cropLimit: 20 });
+
+    is(renderedComponent.textContent, `"${stub.initial}…"`,
+      "LongString rep has expected text content for multiline string when open");
+  }
+
+  function testFullText() {
+    const stub = getGripStub("testFullText");
+    const renderedComponentOpen = renderComponent(
+      LongStringRep.rep, { object: stub, member: {open: true}, cropLimit: 20 });
+
+    is(renderedComponentOpen.textContent, `"${stub.fullText}"`,
+      "LongString rep has expected text content when grip has a fullText " +
+      "property and is open");
+
+    const renderedComponentNotOpen = renderComponent(
+      LongStringRep.rep, { object: stub, cropLimit: 20 });
+
+    is(renderedComponentNotOpen.textContent,
+      `"a\naaaaaaaaaaaaaaaaaa…"`,
+      "LongString rep has expected text content when grip has a fullText " +
+      "property and is not open");
+  }
+
+  function testUseQuotes() {
+    const renderedComponent = renderComponent(LongStringRep.rep,
+      { object: getGripStub("testMultiline"), cropLimit: 20, useQuotes: false });
+
+    is(renderedComponent.textContent,
+      "a\naaaaaaaaaaaaaaaaaa…",
+      "LongString rep was expected to omit quotes");
+  }
+
+  function getGripStub(name) {
+    const multilineFullText = "a\n" + Array(20000).fill("a").join("");
+    const fullTextLength = multilineFullText.length;
+    const initialText = multilineFullText.substring(0, 10000);
+
+    switch (name) {
+      case "testMultiline":
+        return {
+          "type": "longString",
+          "initial": initialText,
+          "length": fullTextLength,
+          "actor": "server1.conn1.child1/longString58"
+        };
+      case "testFullText":
+        return {
+          "type": "longString",
+          "fullText": multilineFullText,
+          "initial": initialText,
+          "length": fullTextLength,
+          "actor": "server1.conn1.child1/longString58"
+        };
+    }
+    return null;
+  }
+});
+</script>
+</pre>
+</body>
+</html>