import Log from './Log';

export class UnitTest {
	testCount = 0;
	successCount = 0;
	failCount = 0;

	assert(test: boolean, desc = ''): boolean {
		this.testCount++;
		if (test === true) {
			this.successCount++;
		} else {
			this.failCount++;
			if (desc) {
				this.warn('Test failed: ' + desc);
			} else {
				throw 'Test failed.';
			}
		}
		return test;
	}
	
	assertThrowsError(fn: Function, desc = ''): boolean {
		var errorThrown = false;
		try {
			fn();
		} catch (e) {
			errorThrown = true;
		}
		return this.assert(errorThrown, desc);
	}
	
	assertEquals(received, expected, desc = ''): boolean {
		var result = this.assert(received === expected, desc);
		if (!result) {
			this.info('Received:', received);
			this.info('Expected:', expected);
		}
		return result;
	}

	printStats(): void {
		this.info(this.testCount + ' tests completed: ' +
			this.successCount + ' succeeded, ' +
			this.failCount + ' failed.');
	}

	info(...r): void {
		Log.info.apply(Log, r);
	}

	warn(...r): void {
		Log.warn.apply(Log, r);
	}
}

export default UnitTest;