add unit test for isInDisplayBounds and config.js (#66)

* add unit test for util: isInDisplayBounds

* add tests for config.js

js/config.js

@@ -158,10 +158,10 @@ function saveUserConfig(fieldName, newValue, oldConfig) {
             if (err) {
                 reject(err);
             } else {
-                resolve();
+                resolve(newConfig);
             }
         });
     });
 }
 
-module.exports = { getConfigField, updateConfigField };
+module.exports = { getConfigField, updateConfigField, configFileName };

js/utils/isInDisplayBounds.js

@@ -2,6 +2,7 @@
 
 const electron = require('electron');
 
+
 /**
  * Returns true if given rectangle is contained within the workArea of at
  * least one of the screens.

js/windowMgr.js

@@ -348,6 +348,7 @@ function sendChildWinBoundsChange(window) {
     let newBounds = getWindowSizeAndPosition(window);
     if (newBounds && boundsChangeWindow) {
         newBounds.windowName = window.winName;
+        // ipc msg back to renderer to inform bounds has changed.
         boundsChangeWindow.send('boundsChange', newBounds);
     }
 }