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diff --git a/devtools/client/webconsole/test/node/components/page-error.test.js b/devtools/client/webconsole/test/node/components/page-error.test.js
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+++ b/devtools/client/webconsole/test/node/components/page-error.test.js
@@ -0,0 +1,531 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Test utils.
+const expect = require("expect");
+const { render, mount } = require("enzyme");
+const sinon = require("sinon");
+
+// React
+const { createFactory } = require("devtools/client/shared/vendor/react");
+const Provider = createFactory(require("react-redux").Provider);
+const { setupStore } = require("devtools/client/webconsole/test/node/helpers");
+const { prepareMessage } = require("devtools/client/webconsole/utils/messages");
+
+// Components under test.
+const PageError = require("devtools/client/webconsole/components/Output/message-types/PageError");
+const {
+  MESSAGE_OPEN,
+  MESSAGE_CLOSE,
+} = require("devtools/client/webconsole/constants");
+const {
+  INDENT_WIDTH,
+} = require("devtools/client/webconsole/components/Output/MessageIndent");
+
+// Test fakes.
+const {
+  stubPackets,
+  stubPreparedMessages,
+} = require("devtools/client/webconsole/test/node/fixtures/stubs/index");
+const serviceContainer = require("devtools/client/webconsole/test/node/fixtures/serviceContainer");
+
+describe("PageError component:", () => {
+  it("renders", () => {
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const wrapper = render(
+      PageError({
+        message,
+        serviceContainer,
+        timestampsVisible: true,
+      })
+    );
+    const {
+      timestampString,
+    } = require("devtools/client/webconsole/utils/l10n");
+
+    expect(wrapper.find(".timestamp").text()).toBe(
+      timestampString(message.timeStamp)
+    );
+
+    expect(wrapper.find(".message-body").text()).toBe(
+      "Uncaught ReferenceError: asdf is not defined[Learn More]"
+    );
+
+    // The stacktrace should be closed by default.
+    const frameLinks = wrapper.find(`.stack-trace`);
+    expect(frameLinks.length).toBe(0);
+
+    // There should be the location.
+    const locationLink = wrapper.find(`.message-location`);
+    expect(locationLink.length).toBe(1);
+    // @TODO Will likely change. See bug 1307952
+    expect(locationLink.text()).toBe("test-console-api.html:3:5");
+  });
+
+  it("does not have a timestamp when timestampsVisible prop is falsy", () => {
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const wrapper = render(
+      PageError({
+        message,
+        serviceContainer,
+        timestampsVisible: false,
+      })
+    );
+
+    expect(wrapper.find(".timestamp").length).toBe(0);
+  });
+
+  it("renders an error with a longString exception message", () => {
+    const message = stubPreparedMessages.get("TypeError longString message");
+    const wrapper = render(PageError({ message, serviceContainer }));
+
+    const text = wrapper.find(".message-body").text();
+    expect(text.startsWith("Uncaught Error: Long error Long error")).toBe(true);
+  });
+
+  it("renders thrown empty string", () => {
+    const message = stubPreparedMessages.get(`throw ""`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe("Uncaught <empty string>");
+  });
+
+  it("renders thrown string", () => {
+    const message = stubPreparedMessages.get(`throw "tomato"`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught tomato`);
+  });
+
+  it("renders thrown boolean", () => {
+    const message = stubPreparedMessages.get(`throw false`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught false`);
+  });
+
+  it("renders thrown number ", () => {
+    const message = stubPreparedMessages.get(`throw 0`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught 0`);
+  });
+
+  it("renders thrown null", () => {
+    const message = stubPreparedMessages.get(`throw null`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught null`);
+  });
+
+  it("renders thrown undefined", () => {
+    const message = stubPreparedMessages.get(`throw undefined`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught undefined`);
+  });
+
+  it("renders thrown Symbol", () => {
+    const message = stubPreparedMessages.get(`throw Symbol`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught Symbol(potato)`);
+  });
+
+  it("renders thrown object", () => {
+    const message = stubPreparedMessages.get(`throw Object`);
+
+    // We need to wrap the PageError in a Provider in order for the
+    // ObjectInspector to work.
+    const wrapper = render(
+      Provider(
+        { store: setupStore() },
+        PageError({ message, serviceContainer })
+      )
+    );
+
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught Object { vegetable: "cucumber" }`);
+  });
+
+  it("renders thrown error", () => {
+    const message = stubPreparedMessages.get(`throw Error Object`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught Error: pumpkin`);
+  });
+
+  it("renders thrown Error with custom name", () => {
+    const message = stubPreparedMessages.get(
+      `throw Error Object with custom name`
+    );
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught JuicyError: pineapple`);
+  });
+
+  it("renders uncaught rejected Promise with empty string", () => {
+    const message = stubPreparedMessages.get(`Promise reject ""`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe("Uncaught (in promise) <empty string>");
+  });
+
+  it("renders uncaught rejected Promise with string", () => {
+    const message = stubPreparedMessages.get(`Promise reject "tomato"`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) tomato`);
+  });
+
+  it("renders uncaught rejected Promise with boolean", () => {
+    const message = stubPreparedMessages.get(`Promise reject false`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) false`);
+  });
+
+  it("renders uncaught rejected Promise with number ", () => {
+    const message = stubPreparedMessages.get(`Promise reject 0`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) 0`);
+  });
+
+  it("renders uncaught rejected Promise with null", () => {
+    const message = stubPreparedMessages.get(`Promise reject null`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) null`);
+  });
+
+  it("renders uncaught rejected Promise with undefined", () => {
+    const message = stubPreparedMessages.get(`Promise reject undefined`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) undefined`);
+  });
+
+  it("renders uncaught rejected Promise with Symbol", () => {
+    const message = stubPreparedMessages.get(`Promise reject Symbol`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) Symbol(potato)`);
+  });
+
+  it("renders uncaught rejected Promise with object", () => {
+    const message = stubPreparedMessages.get(`Promise reject Object`);
+    // We need to wrap the PageError in a Provider in order for the
+    // ObjectInspector to work.
+    const wrapper = render(
+      Provider(
+        { store: setupStore() },
+        PageError({ message, serviceContainer })
+      )
+    );
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) Object { vegetable: "cucumber" }`);
+  });
+
+  it("renders uncaught rejected Promise with error", () => {
+    const message = stubPreparedMessages.get(`Promise reject Error Object`);
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) Error: pumpkin`);
+  });
+
+  it("renders uncaught rejected Promise with Error with custom name", () => {
+    const message = stubPreparedMessages.get(
+      `Promise reject Error Object with custom name`
+    );
+    const wrapper = render(PageError({ message, serviceContainer }));
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(`Uncaught (in promise) JuicyError: pineapple`);
+  });
+
+  it("renders URLs in message as actual, cropped, links", () => {
+    // Let's replace the packet data in order to mimick a pageError.
+    const packet = stubPackets.get("throw string with URL");
+
+    const evilDomain = `https://evil.com/?`;
+    const badDomain = `https://not-so-evil.com/?`;
+    const paramLength = 200;
+    const longParam = "a".repeat(paramLength);
+
+    const evilURL = `${evilDomain}${longParam}`;
+    const badURL = `${badDomain}${longParam}`;
+
+    // We remove the exceptionDocURL to not have the "learn more" link.
+    packet.pageError.exceptionDocURL = null;
+
+    const message = prepareMessage(packet, { getNextId: () => "1" });
+    const wrapper = render(PageError({ message, serviceContainer }));
+
+    // Keep in sync with `urlCropLimit` in PageError.js.
+    const cropLimit = 120;
+    const partLength = cropLimit / 2;
+    const getCroppedUrl = url =>
+      `${url}${"a".repeat(partLength - url.length)}…${"a".repeat(partLength)}`;
+
+    const croppedEvil = getCroppedUrl(evilDomain);
+    const croppedbad = getCroppedUrl(badDomain);
+
+    const text = wrapper.find(".message-body").text();
+    expect(text).toBe(
+      `Uncaught “${croppedEvil}“ is evil and “${croppedbad}“ is not good either`
+    );
+
+    // There should be 2 links.
+    const links = wrapper.find(".message-body a");
+    expect(links.length).toBe(2);
+
+    expect(links.eq(0).attr("href")).toBe(evilURL);
+    expect(links.eq(0).attr("title")).toBe(evilURL);
+
+    expect(links.eq(1).attr("href")).toBe(badURL);
+    expect(links.eq(1).attr("title")).toBe(badURL);
+  });
+
+  it("displays a [Learn more] link", () => {
+    const store = setupStore();
+
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+
+    serviceContainer.openLink = sinon.spy();
+    const wrapper = mount(
+      Provider(
+        { store },
+        PageError({
+          message,
+          serviceContainer,
+          dispatch: () => {},
+        })
+      )
+    );
+
+    // There should be a [Learn more] link.
+    const url =
+      "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Errors/Not_defined";
+    const learnMore = wrapper.find(".learn-more-link");
+    expect(learnMore.length).toBe(1);
+    expect(learnMore.prop("title")).toBe(url);
+
+    learnMore.simulate("click");
+    const call = serviceContainer.openLink.getCall(0);
+    expect(call.args[0]).toEqual(message.exceptionDocURL);
+  });
+
+  // Unskip will happen in Bug 1529548.
+  it.skip("has a stacktrace which can be opened", () => {
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const wrapper = render(
+      PageError({ message, serviceContainer, open: true })
+    );
+
+    // There should be a collapse button.
+    expect(wrapper.find(".collapse-button[aria-expanded=true]").length).toBe(1);
+
+    // There should be five stacktrace items.
+    const frameLinks = wrapper.find(`.stack-trace span.frame-link`);
+    expect(frameLinks.length).toBe(5);
+  });
+
+  // Unskip will happen in Bug 1529548.
+  it.skip("toggle the stacktrace when the collapse button is clicked", () => {
+    const store = setupStore();
+    store.dispatch = sinon.spy();
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+
+    let wrapper = mount(
+      Provider(
+        { store },
+        PageError({
+          message,
+          open: true,
+          dispatch: store.dispatch,
+          serviceContainer,
+        })
+      )
+    );
+
+    wrapper.find(".collapse-button[aria-expanded='true']").simulate("click");
+    let call = store.dispatch.getCall(0);
+    expect(call.args[0]).toEqual({
+      id: message.id,
+      type: MESSAGE_CLOSE,
+    });
+
+    wrapper = mount(
+      Provider(
+        { store },
+        PageError({
+          message,
+          open: false,
+          dispatch: store.dispatch,
+          serviceContainer,
+        })
+      )
+    );
+    wrapper.find(".collapse-button[aria-expanded='false']").simulate("click");
+    call = store.dispatch.getCall(1);
+    expect(call.args[0]).toEqual({
+      id: message.id,
+      type: MESSAGE_OPEN,
+    });
+  });
+
+  it("has the expected indent", () => {
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const indent = 10;
+    let wrapper = render(
+      PageError({
+        message: Object.assign({}, message, { indent }),
+        serviceContainer,
+      })
+    );
+    let indentEl = wrapper.find(".indent");
+    expect(indentEl.prop("style").width).toBe(`${indent * INDENT_WIDTH}px`);
+    expect(indentEl.prop("data-indent")).toBe(`${indent}`);
+
+    wrapper = render(PageError({ message, serviceContainer }));
+    indentEl = wrapper.find(".indent");
+    expect(indentEl.prop("style").width).toBe(`0`);
+    expect(indentEl.prop("data-indent")).toBe(`0`);
+  });
+
+  it("has empty error notes", () => {
+    const message = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const wrapper = render(PageError({ message, serviceContainer }));
+
+    const notes = wrapper.find(".error-note");
+
+    expect(notes.length).toBe(0);
+  });
+
+  it("can show an error note", () => {
+    const origMessage = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const message = Object.assign({}, origMessage, {
+      notes: [
+        {
+          messageBody: "test note",
+          frame: {
+            source: "http://example.com/test.js",
+            line: 2,
+            column: 6,
+          },
+        },
+      ],
+    });
+
+    const wrapper = render(PageError({ message, serviceContainer }));
+
+    const notes = wrapper.find(".error-note");
+    expect(notes.length).toBe(1);
+
+    const note = notes.eq(0);
+    expect(note.find(".message-body").text()).toBe("note: test note");
+
+    // There should be the location.
+    const locationLink = note.find(`.message-location`);
+    expect(locationLink.length).toBe(1);
+    expect(locationLink.text()).toBe("test.js:2:6");
+  });
+
+  it("can show multiple error notes", () => {
+    const origMessage = stubPreparedMessages.get(
+      "ReferenceError: asdf is not defined"
+    );
+    const message = Object.assign({}, origMessage, {
+      notes: [
+        {
+          messageBody: "test note 1",
+          frame: {
+            source: "http://example.com/test1.js",
+            line: 2,
+            column: 6,
+          },
+        },
+        {
+          messageBody: "test note 2",
+          frame: {
+            source: "http://example.com/test2.js",
+            line: 10,
+            column: 18,
+          },
+        },
+        {
+          messageBody: "test note 3",
+          frame: {
+            source: "http://example.com/test3.js",
+            line: 9,
+            column: 4,
+          },
+        },
+      ],
+    });
+
+    const wrapper = render(PageError({ message, serviceContainer }));
+
+    const notes = wrapper.find(".error-note");
+    expect(notes.length).toBe(3);
+
+    const note1 = notes.eq(0);
+    expect(note1.find(".message-body").text()).toBe("note: test note 1");
+
+    const locationLink1 = note1.find(`.message-location`);
+    expect(locationLink1.length).toBe(1);
+    expect(locationLink1.text()).toBe("test1.js:2:6");
+
+    const note2 = notes.eq(1);
+    expect(note2.find(".message-body").text()).toBe("note: test note 2");
+
+    const locationLink2 = note2.find(`.message-location`);
+    expect(locationLink2.length).toBe(1);
+    expect(locationLink2.text()).toBe("test2.js:10:18");
+
+    const note3 = notes.eq(2);
+    expect(note3.find(".message-body").text()).toBe("note: test note 3");
+
+    const locationLink3 = note3.find(`.message-location`);
+    expect(locationLink3.length).toBe(1);
+    expect(locationLink3.text()).toBe("test3.js:9:4");
+  });
+
+  it("displays error notes", () => {
+    const message = stubPreparedMessages.get(
+      "SyntaxError: redeclaration of let a"
+    );
+
+    const wrapper = render(PageError({ message, serviceContainer }));
+
+    const notes = wrapper.find(".error-note");
+    expect(notes.length).toBe(1);
+
+    const note = notes.eq(0);
+    expect(note.find(".message-body").text()).toBe(
+      "note: Previously declared at line 2, column 6"
+    );
+
+    // There should be the location.
+    const locationLink = note.find(`.message-location`);
+    expect(locationLink.length).toBe(1);
+    expect(locationLink.text()).toBe("test-console-api.html:2:6");
+  });
+});