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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-offlineaudiocontext-interface/ctor-offlineaudiocontext.html - WPT Dashboard Interop Dashboard
<!doctype html>
<html>
<head>
<title>Test Constructor: OfflineAudioContext</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
<script src="/webaudio/resources/audionodeoptions.js"></script>
</head>
<body>
<script>
let audit = Audit.createTaskRunner();
// Just a simple test of the 3-arg constructor; This should be
// well-covered by other layout tests that use the 3-arg constructor.
audit.define(
{label: 'basic', description: 'Old-style constructor'},
(task, should) => {
let context;
// First and only arg should be a dictionary.
should(() => {
new OfflineAudioContext(3);
}, 'new OfflineAudioContext(3)').throw(TypeError);
// Constructor needs 1 or 3 args, so 2 should throw.
should(() => {
new OfflineAudioContext(3, 42);
}, 'new OfflineAudioContext(3, 42)').throw(TypeError);
// Valid constructor
should(() => {
context = new OfflineAudioContext(3, 42, 12345);
}, 'context = new OfflineAudioContext(3, 42, 12345)').notThrow();
// Verify that the context was constructed correctly.
should(context.length, 'context.length').beEqualTo(42);
should(context.sampleRate, 'context.sampleRate').beEqualTo(12345);
should(
context.destination.channelCount,
'context.destination.channelCount')
.beEqualTo(3);
should(
context.destination.channelCountMode,
'context.destination.channelCountMode')
.beEqualTo('explicit');
should(
context.destination.channelInterpretation,
'context.destination.channelInterpretation')
.beEqualTo('speakers');
task.done();
});
// Test constructor throws an error if the required members of the
// dictionary are not given.
audit.define(
{label: 'options-1', description: 'Required options'},
(task, should) => {
let context2;
// No args should throw
should(() => {
new OfflineAudioContext();
}, 'new OfflineAudioContext()').throw(TypeError);
// Empty OfflineAudioContextOptions should throw
should(() => {
new OfflineAudioContext({});
}, 'new OfflineAudioContext({})').throw(TypeError);
let options = {length: 42};
// sampleRate is required.
should(
() => {
new OfflineAudioContext(options);
},
'new OfflineAudioContext(' + JSON.stringify(options) + ')')
.throw(TypeError);
options = {sampleRate: 12345};
// length is required.
should(
() => {
new OfflineAudioContext(options);
},
'new OfflineAudioContext(' + JSON.stringify(options) + ')')
.throw(TypeError);
// Valid constructor. Verify that the resulting context has the
// correct values.
options = {length: 42, sampleRate: 12345};
should(
() => {
context2 = new OfflineAudioContext(options);
},
'c2 = new OfflineAudioContext(' + JSON.stringify(options) + ')')
.notThrow();
should(
context2.destination.channelCount,
'c2.destination.channelCount')
.beEqualTo(1);
should(context2.length, 'c2.length').beEqualTo(options.length);
should(context2.sampleRate, 'c2.sampleRate')
.beEqualTo(options.sampleRate);
should(
context2.destination.channelCountMode,
'c2.destination.channelCountMode')
.beEqualTo('explicit');
should(
context2.destination.channelInterpretation,
'c2.destination.channelInterpretation')
.beEqualTo('speakers');
task.done();
});
// Constructor should throw errors for invalid values specified by
// OfflineAudioContextOptions.
audit.define(
{label: 'options-2', description: 'Invalid options'},
(task, should) => {
let options = {length: 42, sampleRate: 8000, numberOfChannels: 33};
// channelCount too large.
should(
() => {
new OfflineAudioContext(options);
},
'new OfflineAudioContext(' + JSON.stringify(options) + ')')
.throw(DOMException, 'NotSupportedError');
// length cannot be 0
options = {length: 0, sampleRate: 8000};
should(
() => {
new OfflineAudioContext(options);
},
'new OfflineAudioContext(' + JSON.stringify(options) + ')')
.throw(DOMException, 'NotSupportedError');
// sampleRate outside valid range
options = {length: 1, sampleRate: 1};
should(
() => {
new OfflineAudioContext(options);
},
'new OfflineAudioContext(' + JSON.stringify(options) + ')')
.throw(DOMException, 'NotSupportedError');
task.done();
});
audit.define(
{label: 'options-3', description: 'Valid options'},
(task, should) => {
let context;
let options = {
length: 1,
sampleRate: 8000,
};
// Verify context with valid constructor has the correct values.
should(
() => {
context = new OfflineAudioContext(options);
},
'c = new OfflineAudioContext' + JSON.stringify(options) + ')')
.notThrow();
should(context.length, 'c.length').beEqualTo(options.length);
should(context.sampleRate, 'c.sampleRate')
.beEqualTo(options.sampleRate);
should(
context.destination.channelCount, 'c.destination.channelCount')
.beEqualTo(1);
should(
context.destination.channelCountMode,
'c.destination.channelCountMode')
.beEqualTo('explicit');
should(
context.destination.channelInterpretation,
'c.destination.channelCountMode')
.beEqualTo('speakers');
options.numberOfChannels = 7;
should(
() => {
context = new OfflineAudioContext(options);
},
'c = new OfflineAudioContext' + JSON.stringify(options) + ')')
.notThrow();
should(
context.destination.channelCount, 'c.destination.channelCount')
.beEqualTo(options.numberOfChannels);
task.done();
});
audit.run();
</script>
</body>
</html>