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add a test for #1728

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This commit is contained in:
Josh de Leeuw 2021-06-28 09:18:00 -04:00
parent 7b16a1d39a
commit 3d678e08db
1 changed files with 18 additions and 0 deletions
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18
tests/jsPsych.randomization/randomziation.test.js
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@ -2,6 +2,7 @@ const root = '../../';
require(root + 'jspsych.js'); require(root + 'jspsych.js');
const originalRandomFunction = Math.random;
describe('#shuffle', function(){ describe('#shuffle', function(){
test('should produce fixed order with mock RNG', function(){ test('should produce fixed order with mock RNG', function(){
@ -25,3 +26,20 @@ describe('#randomID', function(){
expect(jsPsych.randomization.randomID(3)).toBe("37a"); expect(jsPsych.randomization.randomID(3)).toBe("37a");
}); });
}); });
describe('shuffleNoRepeats', function(){
test('should generate a random order with no repeats', function(){
if(typeof Math.random.mock !== 'undefined'){
Math.random = originalRandomFunction;
}
var equalityTest = function(a,b){ return a === b };
var toShuffle = ['a','b','c','d'];
var repeated = jsPsych.randomization.repeat(toShuffle, 20);
var randomOrder = jsPsych.randomization.shuffleNoRepeats(repeated, equalityTest);
var repeats = 0;
for(var i=1; i<randomOrder.length; i++){
if(equalityTest(randomOrder[i], randomOrder[i-1])) { repeats++; }
}
expect(repeats).toBe(0);
})
})