import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

devtools/server/tests/browser/browser_stylesheets_getTextEmpty.js

@@ -0,0 +1,40 @@
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that StyleSheetActor.getText handles empty text correctly.
+
+const {StyleSheetsFront} = require("devtools/shared/fronts/stylesheets");
+
+const CONTENT = "<style>body { background-color: #f0c; }</style>";
+const TEST_URI = "data:text/html;charset=utf-8," + encodeURIComponent(CONTENT);
+
+add_task(function* () {
+  yield addTab(TEST_URI);
+
+  info("Initialising the debugger server and client.");
+  initDebuggerServer();
+  let client = new DebuggerClient(DebuggerServer.connectPipe());
+  let form = yield connectDebuggerClient(client);
+
+  info("Attaching to the active tab.");
+  yield client.attachTab(form.actor);
+
+  let front = StyleSheetsFront(client, form);
+  ok(front, "The StyleSheetsFront was created.");
+
+  let sheets = yield front.getStyleSheets();
+  ok(sheets, "getStyleSheets() succeeded");
+  is(sheets.length, 1,
+     "getStyleSheets() returned the correct number of sheets");
+
+  let sheet = sheets[0];
+  yield sheet.update("", false);
+  let longStr = yield sheet.getText();
+  let source = yield longStr.string();
+  is(source, "", "text is empty");
+
+  yield client.close();
+});