1 files changed, 55 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_stylesheets_getTextEmpty.js b/devtools/server/tests/browser/browser_stylesheets_getTextEmpty.js
new file mode 100644
index 0000000000..8d83392852
--- /dev/null
+++ b/devtools/server/tests/browser/browser_stylesheets_getTextEmpty.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that StyleSheetsActor.getText handles empty text correctly.
+
+const CSS_CONTENT = "body { background-color: #f06; }";
+const TEST_URI = `data:text/html;charset=utf-8,<style>${encodeURIComponent(
+  CSS_CONTENT
+)}</style>`;
+
+add_task(async function() {
+  const target = await addTabTarget(TEST_URI);
+
+  const {
+    ResourceWatcher,
+  } = require("devtools/shared/resources/resource-watcher");
+  const { TargetList } = require("devtools/shared/resources/target-list");
+
+  const targetList = new TargetList(target.client.mainRoot, target);
+  await targetList.startListening();
+  const resourceWatcher = new ResourceWatcher(targetList);
+
+  const styleSheetsFront = await target.getFront("stylesheets");
+  ok(styleSheetsFront, "The StyleSheetsFront was created.");
+
+  const sheets = [];
+  await resourceWatcher.watchResources([ResourceWatcher.TYPES.STYLESHEET], {
+    onAvailable: resources => sheets.push(...resources),
+  });
+  is(sheets.length, 1, "watchResources returned the correct number of sheets");
+
+  const { resourceId } = sheets[0];
+
+  is(
+    await getStyleSheetText(styleSheetsFront, resourceId),
+    CSS_CONTENT,
+    "The stylesheet has expected initial text"
+  );
+  info("Update stylesheet content via the styleSheetsFront");
+  await styleSheetsFront.update(resourceId, "", false);
+  is(
+    await getStyleSheetText(styleSheetsFront, resourceId),
+    "",
+    "Stylesheet is now empty, as expected"
+  );
+
+  await target.destroy();
+});
+
+async function getStyleSheetText(styleSheetsFront, resourceId) {
+  const longStringFront = await styleSheetsFront.getText(resourceId);
+  return longStringFront.string();
+}