adds some tests for #350

but they have problems with shared jsdom window. need to figure out
solution.

tests/jsPsych.data/interactions.test.js

@@ -1,45 +1,43 @@
 const root = '../../';
 
-require(root + 'jspsych.js');
-
-require(root + 'plugins/jspsych-text.js');
-
 describe('Data recording', function(){
 
-  xtest('record focus events', function(){
+  beforeEach(function(){
-    var timeline = [
+    require(root + 'jspsych.js');
-      {type: 'text', text:'hello'}
+    require(root + 'plugins/jspsych-text.js');
-    ];
-    jsPsych.init({timeline:timeline});
-    // click through first trial
-    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
-    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
-    // check if data contains rt
   })
 
-  xtest('record blur events', function(){
+  test('record focus events', function(){
     var timeline = [
       {type: 'text', text:'hello'}
     ];
     jsPsych.init({timeline:timeline});
+    window.dispatchEvent(new Event('focus'));
     // click through first trial
     document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
     document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
-    // check if data contains rt
+    // check data
+    expect(jsPsych.data.getInteractionData().filter({event: 'focus'}).count()).toBe(1);
   })
 
-  xtest('record fullscreenenter events', function(){
+  test('record blur events', function(){
     var timeline = [
       {type: 'text', text:'hello'}
     ];
     jsPsych.init({timeline:timeline});
+    console.log(jsPsych.data.getInteractionData().json())
+    window.dispatchEvent(new Event('blur'));
+    console.log(jsPsych.data.getInteractionData().json())
     // click through first trial
     document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
     document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
-    // check if data contains rt
+    // check data
+    expect(jsPsych.data.getInteractionData().filter({event: 'blur'}).count()).toBe(1);
   })
 
-  xtest('record fullscreenexit events', function(){
+  /* not sure yet how to test fullscreen events with jsdom engine */
+
+  test.skip('record fullscreenenter events', function(){
     var timeline = [
       {type: 'text', text:'hello'}
     ];
@@ -48,24 +46,74 @@ describe('Data recording', function(){
     document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
     document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
     // check if data contains rt
-  })
+  });
+
+  test.skip('record fullscreenexit events', function(){
+    var timeline = [
+      {type: 'text', text:'hello'}
+    ];
+    jsPsych.init({timeline:timeline});
+    // click through first trial
+    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+    // check if data contains rt
+  });
 
 })
 
 describe('on_interaction_data_update', function(){
-  xtest('fires for blur', function(){
 
+  beforeEach(function(){
+    require(root + 'jspsych.js');
+    require(root + 'plugins/jspsych-text.js');
+  })
+
+  test('fires for blur', function(){
+
+    var updatefn = jest.fn();
+
+    var timeline = [
+      {type: 'text', text:'hello'}
+    ];
+    jsPsych.init({
+      timeline:timeline,
+      on_interaction_data_update: updatefn
+    });
+    window.dispatchEvent(new Event('blur'));
+    console.log(jsPsych.data.getInteractionData().json())
+    expect(updatefn.mock.calls.length).toBe(1);
+    // click through first trial
+    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+    // check data
   });
 
-  xtest('fires for focus', function(){
+  test.only('fires for focus', function(){
+    var updatefn = jest.fn();
+
+    var timeline = [
+      {type: 'text', text:'hello'}
+    ];
+    jsPsych.init({
+      timeline:timeline,
+      on_interaction_data_update: updatefn
+    });
+    window.dispatchEvent(new Event('focus'));
+    console.log(jsPsych.data.getInteractionData().json())
+    expect(updatefn.mock.calls.length).toBe(1);
+    // click through first trial
+    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
+    document.querySelector('.jspsych-display-element').dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
+    // check data
+  })
+
+  /* not sure yet how to test fullscreen events with jsdom engine */
+
+  test.skip('fires for fullscreenexit', function(){
 
   })
 
-  xtest('fires for fullscreenexit', function(){
+  test.skip('fires for fullscreenenter', function(){
-
-  })
-
-  xtest('fires for fullscreenenter', function(){
 
   })
 })