JSTests/test262/test/language/expressions/object/dstr/async-gen-meth-dflt-ary-ptrn-elem-ary-empty-init.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-elem-ary-empty-init.case
// - src/dstr-binding/default/async-gen-method-dflt.template
/*---
description: BindingElement with array binding pattern and initializer is used (async generator method (default parameter))
esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
features: [generators, async-iteration]
flags: [generated, async]
info: |
    AsyncGeneratorMethod :
        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
            { AsyncGeneratorBody }

    1. Let propKey be the result of evaluating PropertyName.
    2. ReturnIfAbrupt(propKey).
    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
       Otherwise let strict be false.
    4. Let scope be the running execution context's LexicalEnvironment.
    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
       AsyncGeneratorBody, scope, strict).
    [...]


    13.3.3.6 Runtime Semantics: IteratorBindingInitialization

    BindingElement : BindingPatternInitializer opt

    [...]
    2. If iteratorRecord.[[done]] is true, let v be undefined.
    3. If Initializer is present and v is undefined, then
       a. Let defaultValue be the result of evaluating Initializer.
       b. Let v be ? GetValue(defaultValue).
    4. Return the result of performing BindingInitialization of BindingPattern
       with v and environment as the arguments.

---*/
var initCount = 0;
var iterCount = 0;
var iter = function*() { iterCount += 1; }();


var callCount = 0;
var obj = {
  async *method([[] = function() { initCount += 1; return iter; }()] = []) {
    assert.sameValue(initCount, 1);
    assert.sameValue(iterCount, 0);
    callCount = callCount + 1;
  }
};

obj.method().next().then(() => {
    assert.sameValue(callCount, 1, 'invoked exactly once');
}).then($DONE, $DONE);