2 files changed, 161 insertions, 0 deletions
diff --git a/dom/media/webvtt/test/xpcshell/test_parser.js b/dom/media/webvtt/test/xpcshell/test_parser.js
new file mode 100644
index 0000000000..5ae70f9762
--- /dev/null
+++ b/dom/media/webvtt/test/xpcshell/test_parser.js
@@ -0,0 +1,158 @@
+"use strict";
+
+const { WebVTT } = ChromeUtils.importESModule(
+  "resource://gre/modules/vtt.sys.mjs"
+);
+
+let fakeWindow = {
+  /* eslint-disable object-shorthand */
+  VTTCue: function () {},
+  VTTRegion: function () {},
+  /* eslint-enable object-shorthand */
+};
+
+// We have a better parser check in WPT. Here I want to check that incomplete
+// lines are correctly parsable.
+let tests = [
+  // Signature
+  { input: ["WEBVTT"], cue: 0, region: 0 },
+  { input: ["", "WE", "BVT", "T"], cue: 0, region: 0 },
+  { input: ["WEBVTT - This file has no cues."], cue: 0, region: 0 },
+  { input: ["WEBVTT", " - ", "This file has no cues."], cue: 0, region: 0 },
+
+  // Body with IDs
+  {
+    input: [
+      "WEB",
+      "VTT - This file has cues.\n",
+      "\n",
+      "14\n",
+      "00:01:14",
+      ".815 --> 00:0",
+      "1:18.114\n",
+      "- What?\n",
+      "- Where are we now?\n",
+      "\n",
+      "15\n",
+      "00:01:18.171 --> 00:01:20.991\n",
+      "- T",
+      "his is big bat country.\n",
+      "\n",
+      "16\n",
+      "00:01:21.058 --> 00:01:23.868\n",
+      "- [ Bat",
+      "s Screeching ]\n",
+      "- They won't get in your hair. They're after the bug",
+      "s.\n",
+    ],
+    cue: 3,
+    region: 0,
+  },
+
+  // Body without IDs
+  {
+    input: [
+      "WEBVTT - This file has c",
+      "ues.\n",
+      "\n",
+      "00:01:14.815 --> 00:01:18.114\n",
+      "- What?\n",
+      "- Where are we now?\n",
+      "\n",
+      "00:01:18.171 --> 00:01:2",
+      "0.991\n",
+      "- ",
+      "This is big bat country.\n",
+      "\n",
+      "00:01:21.058 --> 00:01:23.868\n",
+      "- [ Bats S",
+      "creeching ]\n",
+      "- They won't get in your hair. They're after the bugs.\n",
+    ],
+    cue: 3,
+    region: 0,
+  },
+
+  // Note
+  {
+    input: ["WEBVTT - This file has no cues.\n", "\n", "NOTE what"],
+    cue: 0,
+    region: 0,
+  },
+
+  // Regions - This vtt is taken from a WPT
+  {
+    input: [
+      "WE",
+      "BVTT\n",
+      "\n",
+      "REGION\n",
+      "id:0\n",
+      "\n",
+      "REGION\n",
+      "id:1\n",
+      "region",
+      "an",
+      "chor:0%,0%\n",
+      "\n",
+      "R",
+      "EGION\n",
+      "id:2\n",
+      "regionanchor:18446744073709552000%,18446744",
+      "073709552000%\n",
+      "\n",
+      "REGION\n",
+      "id:3\n",
+      "regionanchor: 100%,100%\n",
+      "regio",
+      "nanchor :100%,100%\n",
+      "regionanchor:100% ,100%\n",
+      "regionanchor:100%, 100%\n",
+      "regionanchor:100 %,100%\n",
+      "regionanchor:10",
+      "0%,100 %\n",
+      "\n",
+      "00:00:00.000 --> 00:00:01.000",
+      " region:0\n",
+      "text\n",
+      "\n",
+      "00:00:00.000 --> 00:00:01.000 region:1\n",
+      "text\n",
+      "\n",
+      "00:00:00.000 --> 00:00:01.000 region:3\n",
+      "text\n",
+    ],
+    cue: 3,
+    region: 4,
+  },
+];
+
+function run_test() {
+  tests.forEach(test => {
+    let parser = new WebVTT.Parser(fakeWindow, null);
+    ok(!!parser, "Ok... this is a good starting point");
+
+    let cue = 0;
+    parser.oncue = () => {
+      ++cue;
+    };
+
+    let region = 0;
+    parser.onregion = () => {
+      ++region;
+    };
+
+    parser.onparsingerror = () => {
+      ok(false, "No error accepted");
+    };
+
+    test.input.forEach(input => {
+      parser.parse(new TextEncoder().encode(input));
+    });
+
+    parser.flush();
+
+    equal(cue, test.cue, "Cue value matches");
+    equal(region, test.region, "Region value matches");
+  });
+}
diff --git a/dom/media/webvtt/test/xpcshell/xpcshell.ini b/dom/media/webvtt/test/xpcshell/xpcshell.ini
new file mode 100644
index 0000000000..07aa5d80d8
--- /dev/null
+++ b/dom/media/webvtt/test/xpcshell/xpcshell.ini
@@ -0,0 +1,3 @@
+[DEFAULT]
+
+[test_parser.js]