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3b3bd06819
Add tests that assert the management of the running execution context's LexicalEnvironment and VariableEnvironment components, as created by the following abstract operations: - NewDeclarativeEnvironment - NewObjectEnvironment - NewFunctionEnvironment Many tests require the use of non-strict direct eval, meaning they may not be run in strict mode. This does not effect coverage because the semantics in these cases are not observable from strict mode code. Some situations require the creation of a binding, but this binding has no relevance to the test itself. In these cases, use names consisting solely of the underscore character (`_`). Avoid the use of Block statements wherever possible, as these trigger the creation of additional environments which may interfere with the behavior under test.
55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-function-definitions-runtime-semantics-evaluation
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description: >
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Creation of new variable environment for the BindingIdentifier
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parameter
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info: |
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[...]
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2. Let scope be the running execution context's LexicalEnvironment.
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3. Let funcEnv be NewDeclarativeEnvironment(scope).
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4. Let envRec be funcEnv's EnvironmentRecord.
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5. Let name be StringValue of BindingIdentifier.
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6. Perform envRec.CreateImmutableBinding(name, false).
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7. Let closure be FunctionCreate(Normal, FormalParameters, FunctionBody,
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funcEnv, strict).
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[...]
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flags: [onlyStrict]
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---*/
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var f = 'outside';
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var probeBefore = function() { return f; };
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var setBefore = function() { f = null; };
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var probeParams, setParams, probeBody, setBody;
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var func = function f(
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_ = (
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probeParams = function() { return f; },
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setParams = function() { f = null; }
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)
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) {
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probeBody = function() { return f; };
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setBody = function() { f = null; };
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};
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func();
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assert.sameValue(probeBefore(), 'outside');
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setBefore();
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assert.sameValue(probeBefore(), null);
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assert.sameValue(probeParams(), func, 'inner binding value (from parameters)');
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assert.throws(
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TypeError, setParams, 'inner binding rejects modification (from parameters)'
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);
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assert.sameValue(
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probeParams(), func, 'inner binding is immutable (from parameters)'
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);
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assert.sameValue(probeBody(), func, 'inner binding value (from body)');
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assert.throws(
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TypeError, setBody, 'inner binding rejects modification (from body)'
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);
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assert.sameValue(probeBody(), func, 'inner binding is immutable (from body)');
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