--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test.js	Thu Sep 11 15:26:39 2025 -0600
@@ -0,0 +1,61 @@
+// must load ot.js first
+
+'use strict';
+
+let nQuestions = 10;
+
+for( let i=0; i<allQuestions.length; i++ ) {
+	allQuestions[i].i = i;
+}
+
+console.log(`using ${nQuestions} out of ${allQuestions.length} questions`)
+
+
+function remove(a,i) {
+	return a.splice(i,1)[0];
+}
+
+function removeRandom(a) {
+	let i = Math.floor( Math.random() * a.length );
+	return remove(a,i);
+}
+
+let questions = [];
+let allQuestions2 = JSON.parse(JSON.stringify(allQuestions));
+for( let i=0; i<nQuestions; i++ ) {
+	let p = removeRandom(allQuestions2);
+	let a = [];
+	while( p.a.length > 0 ) {
+		a.push( removeRandom(p.a) );
+	}
+	p.a = a;
+	questions.push(p);
+}
+
+let encoder = document.createElement('span');
+
+function htmlEncode(s) {
+	encoder.textContent = s;
+	return encoder.innerHTML;
+}
+
+function checkTest() {
+	let divs = document.querySelectorAll('div[q]');
+	let nCorrect = 0;
+	for( let div of divs ) {
+		let answer = allQuestions[div.getAttribute('q')].a[0];
+		let selected = div.querySelector('input[type=radio]:checked');
+		if( selected.value === answer ) {
+			selected.parentNode.insertAdjacentHTML( 'afterend', ' <span correct></span>' );
+			nCorrect++;
+		} else {
+			selected.parentNode.insertAdjacentHTML( 'afterend', ' <span wrong></span>' );
+			let correct = div.querySelector(`input[type=radio][value="${htmlEncode(answer)}"]`);
+			correct.parentNode.insertAdjacentHTML( 'afterend', ' <span correct></span>' );
+		}
+	}
+	document.querySelector('div[end]').innerHTML = `\
+		<p>${nCorrect} of ${divs.length} correct</p>
+		<p><a href="/test.html">Try again</a></p>
+`	;
+}