JSTests/test262/test/language/expressions/async-generator/dflt-params-arg-val-not-undefined.js

// This file was procedurally generated from the following sources:
// - src/function-forms/dflt-params-arg-val-not-undefined.case
// - src/function-forms/default/async-gen-func-expr.template
/*---
description: Use of initializer when argument value is not `undefined` (async generator function expression)
esid: sec-asyncgenerator-definitions-evaluation
features: [default-parameters, async-iteration]
flags: [generated, async]
info: |
    AsyncGeneratorExpression : async [no LineTerminator here] function * ( FormalParameters ) {
        AsyncGeneratorBody }

        [...]
        3. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters,
           AsyncGeneratorBody, scope, strict).
        [...]


    14.1.19 Runtime Semantics: IteratorBindingInitialization

    FormalsList : FormalsList , FormalParameter

    [...]
    23. Let iteratorRecord be Record {[[Iterator]]:
        CreateListIterator(argumentsList), [[Done]]: false}.
    24. If hasDuplicates is true, then
        [...]
    25. Else,
        a. Perform ? IteratorBindingInitialization for formals with
           iteratorRecord and env as arguments.
    [...]

---*/
var obj = {};
var falseCount = 0;
var stringCount = 0;
var nanCount = 0;
var zeroCount = 0;
var nullCount = 0;
var objCount = 0;


var callCount = 0;
// Stores a reference `ref` for case evaluation
var ref;
ref = async function*(aFalse = falseCount +=1, aString = stringCount += 1, aNaN = nanCount += 1, a0 = zeroCount += 1, aNull = nullCount += 1, aObj = objCount +=1) {
  assert.sameValue(aFalse, false);
  assert.sameValue(aString, '');
  assert.sameValue(aNaN, NaN);
  assert.sameValue(a0, 0);
  assert.sameValue(aNull, null);
  assert.sameValue(aObj, obj);
  callCount = callCount + 1;
};

ref(false, '', NaN, 0, null, obj).next().then(() => {
    assert.sameValue(callCount, 1, 'generator function invoked exactly once');
}).then($DONE, $DONE);

assert.sameValue(falseCount, 0, 'initializer not evaluated: false');
assert.sameValue(stringCount, 0, 'initializer not evaluated: string');
assert.sameValue(nanCount, 0, 'initializer not evaluated: NaN');
assert.sameValue(zeroCount, 0, 'initializer not evaluated: 0');
assert.sameValue(nullCount, 0, 'initializer not evaluated: null');
assert.sameValue(objCount, 0, 'initializer not evaluated: object');