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// META: global=window,worker,shadowrealm
'use strict';
const transformerMethods = {
start: {
length: 1,
trigger: () => Promise.resolve()
},
transform: {
length: 2,
trigger: ts => ts.writable.getWriter().write()
},
flush: {
length: 1,
trigger: ts => ts.writable.getWriter().close()
}
};
for (const method in transformerMethods) {
const { length, trigger } = transformerMethods[method];
// Some semantic tests of how transformer methods are called can be found in general.js, as well as in the test files
// specific to each method.
promise_test(() => {
let argCount;
const ts = new TransformStream({
[method](...args) {
argCount = args.length;
}
}, undefined, { highWaterMark: Infinity });
return Promise.resolve(trigger(ts)).then(() => {
assert_equals(argCount, length, `${method} should be called with ${length} arguments`);
});
}, `transformer method ${method} should be called with the right number of arguments`);
promise_test(() => {
let methodWasCalled = false;
function Transformer() {}
Transformer.prototype = {
[method]() {
methodWasCalled = true;
}
};
const ts = new TransformStream(new Transformer(), undefined, { highWaterMark: Infinity });
return Promise.resolve(trigger(ts)).then(() => {
assert_true(methodWasCalled, `${method} should be called`);
});
}, `transformer method ${method} should be called even when it's located on the prototype chain`);
}
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