1 files changed, 89 insertions, 0 deletions
diff --git a/dom/media/mediacontrol/tests/browser/browser_media_control_seekto.js b/dom/media/mediacontrol/tests/browser/browser_media_control_seekto.js
new file mode 100644
index 0000000000..70b75841b6
--- /dev/null
+++ b/dom/media/mediacontrol/tests/browser/browser_media_control_seekto.js
@@ -0,0 +1,89 @@
+const PAGE_URL =
+  "https://example.com/browser/dom/media/mediacontrol/tests/browser/file_non_autoplay.html";
+
+const testVideoId = "video";
+
+add_task(async function setupTestingPref() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["media.mediacontrol.testingevents.enabled", true],
+      ["dom.media.mediasession.enabled", true],
+    ],
+  });
+});
+
+/**
+ * This test is used to check if the `seekto` action can be sent when calling
+ * media controller's `seekTo()`. In addition, the seeking related properties
+ * which would be sent to the action handler should also be correct as what we
+ * set in `seekTo()`.
+ */
+add_task(async function testSetPositionState() {
+  info(`open media page`);
+  const tab = await createLoadedTabWrapper(PAGE_URL);
+
+  info(`start media`);
+  await playMedia(tab, testVideoId);
+
+  const seektime = 0;
+  info(`seek to ${seektime} seconds.`);
+  await PerformSeekTo(tab, {
+    seekTime: seektime,
+  });
+
+  info(`seek to ${seektime} seconds and set fastseek to boolean`);
+  await PerformSeekTo(tab, {
+    seekTime: seektime,
+    fastSeek: true,
+  });
+
+  info(`seek to ${seektime} seconds and set fastseek to false`);
+  await PerformSeekTo(tab, {
+    seekTime: seektime,
+    fastSeek: false,
+  });
+
+  info(`remove tab`);
+  await tab.close();
+});
+
+/**
+ * The following is helper function.
+ */
+async function PerformSeekTo(tab, seekDetails) {
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [seekDetails, testVideoId],
+    (seekDetails, Id) => {
+      const { seekTime, fastSeek } = seekDetails;
+      content.navigator.mediaSession.setActionHandler("seekto", details => {
+        ok(details.seekTime != undefined, "Seektime must be presented");
+        is(seekTime, details.seekTime, "Get correct seektime");
+        if (fastSeek) {
+          is(fastSeek, details.fastSeek, "Get correct fastSeek");
+        } else {
+          ok(
+            details.fastSeek === undefined,
+            "Details should not contain fastSeek"
+          );
+        }
+        // We use `onseek` as a hint to know if the `seekto` has been received
+        // or not. The reason we don't return a resolved promise instead is
+        // because if we do so, it can't guarantees that the `seekto` action
+        // handler has been set before calling `mediaController.seekTo`.
+        content.document.getElementById(Id).currentTime = seekTime;
+      });
+    }
+  );
+  const seekPromise = SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [testVideoId],
+    Id => {
+      const video = content.document.getElementById(Id);
+      return new Promise(r => (video.onseeking = r()));
+    }
+  );
+  const { seekTime, fastSeek } = seekDetails;
+  tab.linkedBrowser.browsingContext.mediaController.seekTo(seekTime, fastSeek);
+  await seekPromise;
+}