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+<!DOCTYPE html>
+<head>
+  <script src="https://unpkg.com/jspsych@7.1.2"></script>
+  <script src="https://unpkg.com/@jspsych/plugin-html-button-response@1.1.0"></script>
+  <script src="https://unpkg.com/@jspsych/plugin-html-keyboard-response@1.1.0"></script>
+  <script src="https://cdn.jsdelivr.net/npm/jasmine-core@3.10.1/lib/jasmine-core/jasmine.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/jasmine-core@3.10.1/lib/jasmine-core/jasmine-html.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/jasmine-core@3.10.1/lib/jasmine-core/boot0.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/jasmine-core@3.10.1/lib/jasmine-core/boot1.js"></script>
+  <link rel="stylesheet" href="https://unpkg.com/jspsych@7.1.2/css/jspsych.css">
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/jasmine-core@3.10.1/lib/jasmine-core/jasmine.css">
+  <style>
+    .stimulus {
+      font-size: 40px;
+    }
+  </style>
+</head>
+<body>
+</body>
+<div id="foo" style="visibility: hidden;"></div>
+<script>
+
+async function simulateExperiment(){
+
+  return new Promise((resolve)=>{
+
+    const jsPsych = initJsPsych({
+      display_element: 'foo',
+      on_finish: function(){
+        resolve(jsPsych.data.get());
+      }
+    });
+
+    const instructions = {
+      type: jsPsychHtmlButtonResponse,
+      stimulus: `
+        <p>This experiment measures how fast you can identify whether a number is odd or even.</p>
+        <p>You'll see a number appear on the screen. As quickly as you can:</p>
+        <p>Press the A key if the number is odd.</p>
+        <p>Press the L key if the number is even.</p>
+      `,
+      choices: ['I understand the instructions']
+    }
+
+    const instruction_check = {
+      timeline: [
+        {
+          type: jsPsychHtmlButtonResponse,
+          stimulus: ()=>{ return `
+            <p class="stimulus">${jsPsych.timelineVariable('number')}</p>
+          `},
+          choices: ['A', 'L'],
+          prompt: '<p>To see if you understood the instructions, which key should you press if you see this number?</p>',
+          data: {
+            task: 'instructions-check'
+          },
+          on_finish: (data) => {
+            data.correct = data.response == jsPsych.timelineVariable('answer');
+          }
+        }
+      ],
+      timeline_variables: [
+        {number: 3, answer: 0},
+        {number: 6, answer: 1}
+      ],
+      randomize_order: true  
+    }
+
+    const instructions_check_fail = {
+      timeline: [
+        {
+          type: jsPsychHtmlButtonResponse,
+          stimulus: `<p>You did not answer the questions correctly.</p>
+            <p>We'll show you the instructions again.</p>
+          `,
+          choices: ['Got it']
+        }
+      ],
+      conditional_function: ()=>{
+        const ic_data = jsPsych.data.get().filter({task: 'instructions-check'}).last(2);
+        return !ic_data.select('correct').all((value)=>{return value==true});
+      }
+    }
+
+    const instructions_loop = {
+      timeline: [instructions, instruction_check, instructions_check_fail],
+      loop_function: (data)=>{
+        return !data.filter({task: 'instructions-check'}).select('correct').all((value)=>{return value==true});
+      }
+    }
+
+    const pre_task_start = {
+      type: jsPsychHtmlKeyboardResponse,
+      stimulus: `<p>Great! You are ready to begin the task.</p>
+        <p>Please place your hands over the A and L keys.</p>
+        <p>Press either A or L to begin.</p>
+      `,
+      choices: ['a','l']
+    }
+
+    const snarc = {
+      timeline: [
+        {
+          type: jsPsychHtmlKeyboardResponse,
+          stimulus: `<p class="stimulus">+</p>`,
+          trial_duration: 500,
+          choices: "NO_KEYS"
+        },
+        {
+          type: jsPsychHtmlKeyboardResponse,
+          stimulus: ()=>{ 
+            return `<p class="stimulus">${jsPsych.timelineVariable('number')}</p>`
+          },
+          choices: ['a','l'],
+          data: {
+            digit: jsPsych.timelineVariable('number'),
+            parity: jsPsych.timelineVariable('parity'),
+            magnitude: jsPsych.timelineVariable('magnitude')
+          }
+        }
+      ],
+      timeline_variables: [
+        {number: 1, parity: 'odd', magnitude: 'small'},
+        {number: 2, parity: 'even', magnitude: 'small'},
+        {number: 3, parity: 'odd', magnitude: 'small'},
+        {number: 4, parity: 'even', magnitude: 'small'},
+        {number: 6, parity: 'even', magnitude: 'large'},
+        {number: 7, parity: 'odd', magnitude: 'large'},
+        {number: 8, parity: 'even', magnitude: 'large'},
+        {number: 9, parity: 'odd', magnitude: 'large'}
+      ],
+      sample: {
+        type: 'fixed-repetitions',
+        size: 5
+      }
+    }
+
+    jsPsych.simulate([instructions_loop, pre_task_start, snarc]);
+  });
+}
+
+
+describe("snarc experiment", ()=>{
+  it("contains an equal number of all trial types", async ()=>{
+    
+    const data = await simulateExperiment();
+
+    const all_equal = [
+      data.filter({parity: 'odd', magnitude: 'small'}).count(),
+      data.filter({parity: 'odd', magnitude: 'large'}).count(),
+      data.filter({parity: 'even', magnitude: 'small'}).count(),
+      data.filter({parity: 'even', magnitude: 'large'}).count()
+    ].every((value, i, array)=>{ return value === array[0] });
+
+    expect(all_equal).toBe(true);
+  });
+
+  it("loops if the instructions check is failed", async ()=>{
+
+    const data = await simulateExperiment();
+
+    const looped = data.filter({task:'instructions-check'}).count() > 2;
+    const should_loop = !data.filter({task: 'instructions-check'}).first(2).select('correct').all((x)=>{return x==true});
+    
+    expect(looped).toBe(should_loop);
+  })
+});
+
+</script>
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