@debonet/es6pacts/test/v2compat.test.js

Releasable/cancellable and Reporting Promises for Javascript ES6

// v2 continuity port from /Users/jsd/@aios/tmp/v2ref/es6pacts/test/es6pacts.test.js
// per specs/v3-v2compat.md: helper constructor edit only; test body verbatim.
const Pact = require( "../src/es6pacts.js" );


function fpPactDelay( dtm, dtmReport = 100 ){
	return new Pact(( fResolve, fReject, fReport ) => {
		let timeout;
		let dtmSlept = 0;
		let f = () => {
			let r = dtm > 0 ? dtmSlept / dtm : 0;
			fReport( r );
			if ( dtmSlept < ( dtm - dtmReport )){
				dtmSlept += dtmReport;
				timeout = setTimeout( f, dtmReport );
			}
			else if ( dtmSlept < dtm ){
				timeout = setTimeout( f, dtm - dtmSlept );
				dtmSlept = dtm;
			}
			else{
				fResolve( dtm );
			}
		}
		f();
		return () => clearTimeout( timeout );
	});
}


// --------------------------------------------
test( "simple resolve", async () => {

	let sProgress = "";

	const p1 = fpPactDelay( 10000 )
		.progress(( x ) => sProgress += x + ", " )

	setTimeout(() => { p1.resolve("faster"); }, 300);

	const s = await	p1;
	expect( s ).toBe( "faster" );


	expect( sProgress ).toBe( "0, 0.01, 0.02, " );
});