Bug 1264557 - Add test cases for expand/collapse buttons. r=honza

--HG--
extra : histedit_source : 0c3c6197f3fbce7ff7c3f3f7d90131775eceac4e

devtools/client/jsonview/test/browser.ini

@@ -58,3 +58,4 @@ support-files =
 [browser_jsonview_theme.js]
 [browser_jsonview_url_linkification.js]
 [browser_jsonview_valid_json.js]
+[browser_jsonview_expand_collapse.js]

devtools/client/jsonview/test/browser_jsonview_expand_collapse.js

@@ -0,0 +1,39 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_JSON_URL = URL_ROOT + "array_json.json";
+const EXPAND_THRESHOLD = 100 * 1024;
+
+add_task(async function() {
+  info("Test expand/collapse JSON started");
+
+  await addJsonViewTab(TEST_JSON_URL);
+  let browser = gBrowser.selectedBrowser, selector, countAfter, countBefore, json;
+
+  /* Initial sanity check */
+  countBefore = await getElementCount(".treeRow");
+  ok(countBefore == 6, "There must be six rows");
+
+  /* Test the "Collapse All" button */
+  selector = ".jsonPanelBox .toolbar button.collapse";
+  await BrowserTestUtils.synthesizeMouseAtCenter(selector, {}, browser);
+  countAfter = await getElementCount(".treeRow");
+  ok(countAfter == 3, "There must be three rows");
+
+  /* Test the "Expand All" button */
+  selector = ".jsonPanelBox .toolbar button.expand";
+  await BrowserTestUtils.synthesizeMouseAtCenter(selector, {}, browser);
+  countAfter = await getElementCount(".treeRow");
+  ok(countAfter == 6, "There must be six expanded rows");
+
+  /* Test big file handling */
+  json = JSON.stringify({data: Array(1e5).fill().map(x => "hoot"), status: "ok"});
+  ok(json.length > EXPAND_THRESHOLD, "The generated JSON must be larger than 100kB");
+  await addJsonViewTab("data:application/json," + json);
+  ok(document.querySelector(selector) == null, "The Expand All button must be gone");
+
+});