2 files changed, 105 insertions, 1 deletions
diff --git a/dom/media/test/browser/wmfme/browser.toml b/dom/media/test/browser/wmfme/browser.toml
index 422ea29228..7449d232d9 100644
--- a/dom/media/test/browser/wmfme/browser.toml
+++ b/dom/media/test/browser/wmfme/browser.toml
@@ -3,11 +3,17 @@ subsuite = "media-bc"
 tags = "media-engine-compatible"
 run-if = ["wmfme"]
 support-files = [
-  "head.js",
   "file_video.html",
+  "head.js",
+  "../head.js",
+  "../../eme_standalone.js",
   "../../gizmo.mp4",
+  "../../sintel-short-clearkey-subsample-encrypted-video.webm",
+  "../../../mediasource/test/bipbop/bipbop2s.mp4",
 ]
 
 ["browser_wmfme_crash.js"]
 
+["browser_wmfme_glean_first_frame_loaded_time.js"]
+
 ["browser_wmfme_max_crashes.js"]
diff --git a/dom/media/test/browser/wmfme/browser_wmfme_glean_first_frame_loaded_time.js b/dom/media/test/browser/wmfme/browser_wmfme_glean_first_frame_loaded_time.js
new file mode 100644
index 0000000000..f9e97aaa49
--- /dev/null
+++ b/dom/media/test/browser/wmfme/browser_wmfme_glean_first_frame_loaded_time.js
@@ -0,0 +1,98 @@
+"use strict";
+
+// Disabling undef warning because in `run()` we use functions from head.js
+/* eslint-disable no-undef */
+
+/**
+ * This test is used to ensure that Glean probe 'first_frame_loaded' can be
+ * recorded correctly in different situations.
+ */
+
+/* import-globals-from ../head.js */
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/dom/media/test/browser/head.js",
+  this
+);
+
+add_task(async function setupTestingPref() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["media.wmf.media-engine.enabled", 1],
+      ["media.wmf.media-engine.channel-decoder.enabled", true],
+      ["media.eme.wmf.clearkey.enabled", true],
+    ],
+  });
+});
+
+const testCases = [
+  {
+    expected: {
+      playback_type: "Non-MSE media-engine playback",
+      video_codec: "video/avc",
+      resolution: "AV,240<h<=480",
+      key_system: undefined,
+    },
+    async run(tab) {
+      await loadVideo(tab);
+    },
+  },
+  {
+    expected: {
+      playback_type: "MSE media-engine playback",
+      video_codec: "video/avc",
+      resolution: "AV,240<h<=480",
+      key_system: undefined,
+    },
+    async run(tab) {
+      await loadMseVideo(tab);
+    },
+  },
+  // TODO : we're not able to run MFCDM EME playback yet, see bug 1870722.
+  // {
+  //   expected: {
+  //     playback_type: "EME media-engine playback",
+  //     video_codec: "video/vp9",
+  //     resolution: "V,240<h<=480",
+  //     key_system: "org.w3.clearkey",
+  //   },
+  //   async run(tab) {
+  //     await loadEmeVideo(tab);
+  //   },
+  // },
+];
+
+add_task(async function testGleanMediaPlayackFirstFrameLoaded() {
+  for (let test of testCases) {
+    Services.fog.testResetFOG();
+
+    const expected = test.expected;
+    info(`running test for '${expected.playback_type}'`);
+    const tab = await openTab();
+    await test.run(tab);
+
+    info(`waiting until glean probe is ready on the parent process`);
+    await Services.fog.testFlushAllChildren();
+
+    info("checking the collected results");
+    const extra = Glean.mediaPlayback.firstFrameLoaded.testGetValue()[0].extra;
+    Assert.greater(
+      parseInt(extra.first_frame_loaded_time),
+      0,
+      `${extra.first_frame_loaded_time} is correct`
+    );
+    is(
+      extra.playback_type,
+      expected.playback_type,
+      `${extra.playback_type} is correct`
+    );
+    is(
+      extra.video_codec,
+      expected.video_codec,
+      `${extra.video_codec} is correct`
+    );
+    is(extra.resolution, expected.resolution, `${extra.resolution} is correct`);
+    is(extra.key_system, expected.key_system, `${extra.key_system} is correct`);
+
+    BrowserTestUtils.removeTab(tab);
+  }
+});