src/function-forms/unscopables-with.case

// Copyright (c) 2020 Rick Waldron. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
desc: Symbol.unscopables behavior across scope boundaries
template: default/*func*.template
esid: sec-symbol.unscopables
info: |
  ...
  Let envRec be lex's EnvironmentRecord.
  Let exists be ? envRec.HasBinding(name).

  HasBinding

  ...
  If the withEnvironment flag of envRec is false, return true.
  Let unscopables be ? Get(bindings, @@unscopables).
  If Type(unscopables) is Object, then
     Let blocked be ToBoolean(? Get(unscopables, N)).
     If blocked is true, return false.

  (The `with` Statement) Runtime Semantics: Evaluation

  ...
  Set the withEnvironment flag of newEnv’s EnvironmentRecord to true.
  ...

flags: [noStrict]
features: [globalThis, Symbol.unscopables]
---*/

//- setup
let count = 0;
var v = 1;
globalThis[Symbol.unscopables] = {
  v: true,
};

{
  count++;
//- params
x
//- args
10
//- body
count++;
with (globalThis) {
  count++;
  assert.sameValue(v, undefined, 'The value of `v` is expected to equal `undefined`');
}
count++;
var v = x;
with (globalThis) {
  count++;
  assert.sameValue(v, 10, 'The value of `v` is 10');
  v = 20;
}
assert.sameValue(v, 20, 'The value of `v` is 20');
assert.sameValue(globalThis.v, 1, 'The value of globalThis.v is 1');
//- teardown
  count++;
}
assert.sameValue(count, 6, 'The value of `count` is 6');