constant-source-basic.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>Basic ConstantSourceNode Tests</title>

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

    <script src="../../resources/start-stop-exceptions.js"></script>

  </head>

  <body>

    <script>

      const context = new AudioContext();

      test(() => {

        const node = new ConstantSourceNode(context);

        verifyNodeDefaults(node);

      }, `ConstantSourceNode constructor creates a valid node `+

          `with correct defaults`);

      test(() => {

        const node = new ConstantSourceNode(context);

        testStartStop_W3CTH(node);

      }, `ConstantSourceNode start()/stop() should throw correct `+

          `exceptions per spec`);

      test(() => {

        const node = context.createConstantSource();

        assert_true(node instanceof ConstantSourceNode,

            'Factory should return a ConstantSourceNode');

        verifyNodeDefaults(node);

      }, `context.createConstantSource() creates a ConstantSourceNode `+

          `with correct defaults`);

      test(() => {

        const node = context.createConstantSource();

        testStartStop_W3CTH(node);

      }, `context.createConstantSource() node start()/stop() should `+

          `throw correct exceptions per spec`);

      function verifyNodeDefaults(node) {

        assert_equals(node.numberOfInputs, 0, 'numberOfInputs should be 0');

        assert_equals(node.numberOfOutputs, 1, 'numberOfOutputs should be 1');

        assert_equals(node.channelCount, 2, 'channelCount should be 2');

        assert_equals(

            node.channelCountMode, 'max', 'channelCountMode should be "max"');

        assert_equals(

            node.channelInterpretation,

            'speakers',

            'channelInterpretation should be "speakers"');

        assert_equals(node.offset.value, 1, 'offset.value should be 1');

        assert_equals(

            node.offset.defaultValue, 1, 'offset.defaultValue should be 1');

        assert_equals(

            node.offset.minValue,

            Math.fround(-3.4028235e38),

            'offset.minValue should match spec');

        assert_equals(

            node.offset.maxValue,

            Math.fround(3.4028235e38),

            'offset.maxValue should match spec');

    </script>

  </body>

</html>