1 files changed, 114 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/test/browser_net_json-null.js b/devtools/client/netmonitor/test/browser_net_json-null.js
new file mode 100644
index 0000000000..ec040aaca1
--- /dev/null
+++ b/devtools/client/netmonitor/test/browser_net_json-null.js
@@ -0,0 +1,114 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests if JSON responses containing null values are properly displayed.
+ */
+
+add_task(async function () {
+  const { tab, monitor } = await initNetMonitor(JSON_BASIC_URL + "?name=null", {
+    requestCount: 1,
+  });
+  info("Starting test... ");
+
+  const { document, store, windowRequire } = monitor.panelWin;
+  const { L10N } = windowRequire("devtools/client/netmonitor/src/utils/l10n");
+  const Actions = windowRequire("devtools/client/netmonitor/src/actions/index");
+
+  store.dispatch(Actions.batchEnable(false));
+
+  // Execute requests.
+  await performRequests(monitor, tab, 1);
+
+  const onResponsePanelReady = waitForDOM(
+    document,
+    "#response-panel .data-header"
+  );
+
+  const onPropsViewReady = waitForDOM(
+    document,
+    "#response-panel .properties-view",
+    1
+  );
+  store.dispatch(Actions.toggleNetworkDetails());
+  clickOnSidebarTab(document, "response");
+  await Promise.all([onResponsePanelReady, onPropsViewReady]);
+
+  const tabpanel = document.querySelector("#response-panel");
+  is(
+    tabpanel.querySelectorAll(".raw-data-toggle").length,
+    1,
+    "There should be 1 raw response toggle."
+  );
+  is(
+    tabpanel.querySelectorAll(".treeRow").length,
+    1,
+    "There should be 1 json properties displayed in this tabpanel."
+  );
+  is(
+    tabpanel.querySelectorAll(".empty-notice").length,
+    0,
+    "The empty notice should not be displayed in this tabpanel."
+  );
+
+  const labels = tabpanel.querySelectorAll("tr .treeLabelCell .treeLabel");
+  const values = tabpanel.querySelectorAll("tr .treeValueCell .objectBox");
+
+  is(
+    labels[0].textContent,
+    "greeting",
+    "The first json property name was incorrect."
+  );
+  is(
+    values[0].textContent,
+    "null",
+    "The first json property value was incorrect."
+  );
+
+  const onCodeMirrorReady = waitForDOM(
+    document,
+    "#response-panel .CodeMirror-code"
+  );
+
+  const rawResponseToggle = document.querySelector(
+    "#response-panel .raw-data-toggle-input .devtools-checkbox-toggle"
+  );
+  clickElement(rawResponseToggle, monitor);
+
+  await onCodeMirrorReady;
+
+  checkResponsePanelDisplaysJSON();
+
+  await teardown(monitor);
+
+  /**
+   * Helper to assert that the response panel found in the provided document is currently
+   * showing a preview of a JSON object.
+   */
+  function checkResponsePanelDisplaysJSON() {
+    const panel = document.querySelector("#response-panel");
+    is(
+      panel.querySelector(".response-error-header") === null,
+      true,
+      "The response error header doesn't have the intended visibility."
+    );
+    const jsonView = panel.querySelector(".data-label") || {};
+    is(
+      jsonView.textContent === L10N.getStr("jsonScopeName"),
+      true,
+      "The response json view has the intended visibility."
+    );
+    is(
+      panel.querySelector(".CodeMirror-code") === null,
+      false,
+      "The response editor has the intended visibility."
+    );
+    is(
+      panel.querySelector(".response-image-box") === null,
+      true,
+      "The response image box doesn't have the intended visibility."
+    );
+  }
+});