Add RTCDataChannel-binaryType.html from PR13499 (#16043)

Co-authored-by: Dominique Hazael-Massieux <[email protected]>

webrtc/RTCDataChannel-binaryType.window.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const validBinaryTypes = ['blob', 'arraybuffer'];
+const invalidBinaryTypes = ['jellyfish', 'arraybuffer ', '', null, undefined];
+
+for (const binaryType of validBinaryTypes) {
+  test((t) => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    const dc = pc.createDataChannel('test-binary-type');
+
+    dc.binaryType = binaryType;
+    assert_equals(dc.binaryType, binaryType, `dc.binaryType should be '${binaryType}'`);
+  }, `Setting binaryType to '${binaryType}' should succeed`);
+}
+
+for (const binaryType of invalidBinaryTypes) {
+  test((t) => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    const dc = pc.createDataChannel('test-binary-type');
+
+    assert_throws('SyntaxError', () => {
+      dc.binaryType = binaryType;
+    });
+  }, `Setting invalid binaryType '${binaryType}' should throw SyntaxError`);
+}