add tests for conditional_function

tests/timelines.test.js

@@ -117,4 +117,117 @@ describe('loop function', function(){
     expect(jsPsych.data.get().count()).toBe(3);
 
   });
+
+});
+
+describe('conditional function', function(){
+
+  test('skips the timeline when returns false', function(){
+
+    var conditional = {
+      timeline: [{
+        type: 'text',
+        text: 'foo'
+      }],
+      conditional_function: function(){
+        return false;
+      }
+    }
+
+    var trial = {
+      type: 'text',
+      text: 'bar'
+    }
+
+    jsPsych.init({
+      timeline: [conditional, trial]
+    });
+
+    expect(jsPsych.getDisplayElement().innerHTML).toBe('bar');
+
+    // clear
+    document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+  });
+
+  test('completes the timeline when returns true', function(){
+    var conditional = {
+      timeline: [{
+        type: 'text',
+        text: 'foo'
+      }],
+      conditional_function: function(){
+        return true;
+      }
+    }
+
+    var trial = {
+      type: 'text',
+      text: 'bar'
+    }
+
+    jsPsych.init({
+      timeline: [conditional, trial]
+    });
+
+    expect(jsPsych.getDisplayElement().innerHTML).toBe('foo');
+
+    // next
+    document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+
+    expect(jsPsych.getDisplayElement().innerHTML).toBe('bar');
+
+    // clear
+    document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+  });
+
+  test('executes on every loop of the timeline', function(){
+
+    var count = 0;
+    var conditional_count = 0;
+
+    var trial = {
+      timeline: [{
+        type: 'text',
+        text: 'foo'
+      }],
+      loop_function: function(){
+        if(count < 1){
+          count++;
+          return true;
+        } else {
+          return false;
+        }
+      },
+      conditional_function: function(){
+        conditional_count++;
+        return true;
+      }
+    }
+
+    jsPsych.init({
+      timeline: [trial]
+    });
+
+    expect(conditional_count).toBe(1);
+
+    // first trial
+    document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+
+    expect(conditional_count).toBe(2);
+
+    // second trial
+    document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+
+    expect(conditional_count).toBe(2);
+  });
+
+});
+
+describe('endCurrentTimeline', function(){
+
 });