1 files changed, 73 insertions, 0 deletions
diff --git a/devtools/client/shared/sourceeditor/test/browser_editor_cursor_blink.js b/devtools/client/shared/sourceeditor/test/browser_editor_cursor_blink.js
new file mode 100644
index 0000000000..5005afc0fd
--- /dev/null
+++ b/devtools/client/shared/sourceeditor/test/browser_editor_cursor_blink.js
@@ -0,0 +1,73 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test to make sure that the editor reacts to preference changes
+
+const CARET_BLINK_TIME = "ui.caretBlinkTime";
+
+add_task(async function () {
+  Services.prefs.clearUserPref(CARET_BLINK_TIME);
+
+  info(`Test when "${CARET_BLINK_TIME}" isn't set`);
+  let { ed, win } = await setup();
+  checkCssCustomPropertyValue(
+    ed,
+    530,
+    "When preference isn't set, blink time is set to codeMirror default"
+  );
+  ed.destroy();
+  win.close();
+
+  info(`Test with a positive value for "${CARET_BLINK_TIME}"`);
+  let blinkTime = 200;
+  Services.prefs.setIntPref(CARET_BLINK_TIME, blinkTime);
+  ({ ed, win } = await setup());
+
+  checkCssCustomPropertyValue(
+    ed,
+    blinkTime,
+    "When preference is set, blink time reflects the pref value"
+  );
+  ed.destroy();
+  win.close();
+
+  info(`Test when "${CARET_BLINK_TIME}" is 0`);
+  blinkTime = 0;
+  Services.prefs.setIntPref(CARET_BLINK_TIME, blinkTime);
+  ({ ed, win } = await setup());
+
+  checkCssCustomPropertyValue(
+    ed,
+    blinkTime,
+    "When preference value is 0, blink time is also 0"
+  );
+  ed.destroy();
+  win.close();
+
+  info(`Test when "${CARET_BLINK_TIME}" is -1`);
+  blinkTime = -1;
+  Services.prefs.setIntPref(CARET_BLINK_TIME, blinkTime);
+  ({ ed, win } = await setup());
+
+  checkCssCustomPropertyValue(
+    ed,
+    0,
+    "When preference value is negative, blink time is 0"
+  );
+  ed.destroy();
+  win.close();
+
+  Services.prefs.clearUserPref(CARET_BLINK_TIME);
+});
+
+function checkCssCustomPropertyValue(editor, expectedMsValue, assertionText) {
+  is(
+    editor.codeMirror
+      .getWrapperElement()
+      .style.getPropertyValue("--caret-blink-time"),
+    `${expectedMsValue}ms`,
+    assertionText
+  );
+}