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test.js
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test.js
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'use strict';
// Flags: --expose-gc
const common = require('../../common');
const assert = require('assert');
const test_reference = require(`./build/${common.buildType}/test_reference`);
// This test script uses external values with finalizer callbacks
// in order to track when values get garbage-collected. Each invocation
// of a finalizer callback increments the finalizeCount property.
assert.strictEqual(test_reference.finalizeCount, 0);
// Run each test function in sequence,
// with an async delay and GC call between each.
function runTests(i, title, tests) {
if (tests[i]) {
if (typeof tests[i] === 'string') {
title = tests[i];
runTests(i + 1, title, tests);
} else {
try {
tests[i]();
} catch (e) {
console.error(`Test failed: ${title}`);
throw e;
}
setImmediate(() => {
global.gc();
runTests(i + 1, title, tests);
});
}
}
}
runTests(0, undefined, [
'External value without a finalizer',
() => {
const value = test_reference.createExternal();
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(typeof value, 'object');
test_reference.checkExternal(value);
},
() => {
assert.strictEqual(test_reference.finalizeCount, 0);
},
'External value with a finalizer',
() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(typeof value, 'object');
test_reference.checkExternal(value);
},
() => {
assert.strictEqual(test_reference.finalizeCount, 1);
},
'Weak reference',
() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.createReference(value, 0);
assert.strictEqual(test_reference.referenceValue, value);
},
() => {
// Value should be GC'd because there is only a weak ref
assert.strictEqual(test_reference.referenceValue, undefined);
assert.strictEqual(test_reference.finalizeCount, 1);
test_reference.deleteReference();
},
'Strong reference',
() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.createReference(value, 1);
assert.strictEqual(test_reference.referenceValue, value);
},
() => {
// Value should NOT be GC'd because there is a strong ref
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.deleteReference();
},
() => {
// Value should be GC'd because the strong ref was deleted
assert.strictEqual(test_reference.finalizeCount, 1);
},
'Strong reference, increment then decrement to weak reference',
() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.createReference(value, 1);
},
() => {
// Value should NOT be GC'd because there is a strong ref
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(test_reference.incrementRefcount(), 2);
},
() => {
// Value should NOT be GC'd because there is a strong ref
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(test_reference.decrementRefcount(), 1);
},
() => {
// Value should NOT be GC'd because there is a strong ref
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(test_reference.decrementRefcount(), 0);
},
() => {
// Value should be GC'd because the ref is now weak!
assert.strictEqual(test_reference.finalizeCount, 1);
test_reference.deleteReference();
},
() => {
// Value was already GC'd
assert.strictEqual(test_reference.finalizeCount, 1);
},
]);