Diffusion Ant (slabs) Code

ant/tests/test_async_this_context.cjs
327d21970a03slabs

test_async_this_context.cjs
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			// Test that 'this' is preserved in async callbacks

			class AsyncContextTest {
			constructor(name) {
			this.name = name;
			this.value = 100;
			}

			testPromiseThen() {
			console.log('=== testPromiseThen ===');
			console.log('Before promise: this.name = ' + this.name);

			return Promise.resolve(42).then((val) => {
			console.log('Inside .then(): this.name = ' + this.name);
			console.log('Inside .then(): this.value = ' + this.value);
			return this.value + val;
			});
			}

			testNestedPromises() {
			console.log('\n=== testNestedPromises ===');
			console.log('Before promise: this.name = ' + this.name);

			return Promise.resolve(10).then((val1) => {
			console.log('First .then(): this.name = ' + this.name);
			return Promise.resolve(val1 + this.value).then((val2) => {
			console.log('Second .then(): this.name = ' + this.name);
			return val2 * 2;
			});
			});
			}

			testMethodCallingAsync() {
			console.log('\n=== testMethodCallingAsync ===');
			console.log('Before: this.name = ' + this.name);

			const helper = () => {
			console.log('Inside helper: this.name = ' + this.name);
			return this.value;
			};

			return Promise.resolve(1).then(() => {
			console.log('In .then(), calling helper');
			return helper();
			});
			}
			}

			const obj = new AsyncContextTest('TestObject');

			obj.testPromiseThen().then((result) => {
			console.log('Result 1: ' + result);
			});

			obj.testNestedPromises().then((result) => {
			console.log('Result 2: ' + result);
			});

			obj.testMethodCallingAsync().then((result) => {
			console.log('Result 3: ' + result);
			});

			console.log('\n=== All tests queued ===');

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