1 files changed, 94 insertions, 0 deletions
diff --git a/dom/midi/tests/MIDITestUtils.js b/dom/midi/tests/MIDITestUtils.js
new file mode 100644
index 0000000000..779a961991
--- /dev/null
+++ b/dom/midi/tests/MIDITestUtils.js
@@ -0,0 +1,94 @@
+var MIDITestUtils = {
+  permissionSetup: allow => {
+    let permPromiseRes;
+    let permPromise = new Promise((res, rej) => {
+      permPromiseRes = res;
+    });
+    SpecialPowers.pushPrefEnv(
+      {
+        set: [
+          ["dom.webmidi.enabled", true],
+          ["midi.testing", true],
+          ["midi.prompt.testing", true],
+          ["media.navigator.permission.disabled", allow],
+        ],
+      },
+      () => {
+        permPromiseRes();
+      }
+    );
+    return permPromise;
+  },
+  // This list needs to stay synced with the ports in
+  // dom/midi/TestMIDIPlatformService.
+  inputInfo: {
+    get id() {
+      return MIDITestUtils.stableId(this);
+    },
+    name: "Test Control MIDI Device Input Port",
+    manufacturer: "Test Manufacturer",
+    version: "1.0.0",
+  },
+  outputInfo: {
+    get id() {
+      return MIDITestUtils.stableId(this);
+    },
+    name: "Test Control MIDI Device Output Port",
+    manufacturer: "Test Manufacturer",
+    version: "1.0.0",
+  },
+  stateTestInputInfo: {
+    get id() {
+      return MIDITestUtils.stableId(this);
+    },
+    name: "Test State MIDI Device Input Port",
+    manufacturer: "Test Manufacturer",
+    version: "1.0.0",
+  },
+  stateTestOutputInfo: {
+    get id() {
+      return MIDITestUtils.stableId(this);
+    },
+    name: "Test State MIDI Device Output Port",
+    manufacturer: "Test Manufacturer",
+    version: "1.0.0",
+  },
+  alwaysClosedTestOutputInfo: {
+    get id() {
+      return MIDITestUtils.stableId(this);
+    },
+    name: "Always Closed MIDI Device Output Port",
+    manufacturer: "Test Manufacturer",
+    version: "1.0.0",
+  },
+  checkPacket: (expected, actual) => {
+    if (expected.length != actual.length) {
+      ok(false, "Packet " + expected + " length not same as packet " + actual);
+    }
+    for (var i = 0; i < expected.length; ++i) {
+      is(expected[i], actual[i], "Packet value " + expected[i] + " matches.");
+    }
+  },
+  stableId: async info => {
+    // This computes the stable ID of a MIDI port according to the logic we
+    // use in the Web MIDI implementation. See MIDIPortChild::GenerateStableId()
+    // and nsContentUtils::AnonymizeId().
+    const id = info.name + info.manufacturer + info.version;
+    const encoder = new TextEncoder();
+    const data = encoder.encode(id);
+    const keyBytes = encoder.encode(self.origin);
+    const key = await crypto.subtle.importKey(
+      "raw",
+      keyBytes,
+      { name: "HMAC", hash: "SHA-256" },
+      false,
+      ["sign"]
+    );
+    const result = new Uint8Array(await crypto.subtle.sign("HMAC", key, data));
+    let resultString = "";
+    for (let i = 0; i < result.length; i++) {
+      resultString += String.fromCharCode(result[i]);
+    }
+    return btoa(resultString);
+  },
+};