third_party/blink/web_tests/webaudio/audio-scheduled-source-basic.html

<!DOCTYPE html>
<html>
  <head>
    <title>Test AudioScheduledSourceNode</title>
    <script src="../resources/testharness.js"></script>
    <script src="../resources/testharnessreport.js"></script>
  </head>
  <body>
    <script>
      "use strict";

      // Constructing AudioScheduledSourceNode should fail
      test(() => {
        const context = new AudioContext();
        assert_throws_js(
            TypeError,
            () => new AudioScheduledSourceNode(context),
            "new AudioScheduledSourceNode(context) should throw TypeError"
        );
      }, "Constructing AudioScheduledSourceNode should fail");

      // Verify scheduling properties on
      // AudioScheduledSourceNode and its derived nodes
      test(() => {
        const expectedProperties = ["start", "stop", "onended"];

        // AudioScheduledSourceNode must *own* these properties.
        for (const prop of expectedProperties) {
          assert_own_property(
              AudioScheduledSourceNode.prototype,
              prop,
              `AudioScheduledSourceNode.prototype should own`+
              `property "${prop}"`
          );
        }

        // ConstantSourceNode and OscillatorNode must NOT own them.
        const noOwnProps = ["ConstantSourceNode", "OscillatorNode"];
        for (const ctorName of noOwnProps) {
          for (const prop of expectedProperties) {
            assert_not_own_property(
                self[ctorName].prototype,
                prop,
                `${ctorName}.prototype should NOT own property "${prop}"`
            );
          }
        }

        // AudioBufferSourceNode has its own "start" method,
        // but not the others.
        for (const prop of expectedProperties) {
          if (prop !== "start") {
            assert_not_own_property(
                AudioBufferSourceNode.prototype,
                prop,
                `AudioBufferSourceNode.prototype should NOT own` +
                `property "${prop}"`
            );
          }
        }
        assert_own_property(
            AudioBufferSourceNode.prototype,
            "start",
            'AudioBufferSourceNode.prototype should own property "start"'
        );
      }, "Verifying properties on AudioScheduledSourceNode and derived nodes");
    </script>
  </body>
</html>