diff --git a/spec/api-app-spec.js b/spec/api-app-spec.js
index 1dc9fae100..9212e9711b 100644
--- a/spec/api-app-spec.js
+++ b/spec/api-app-spec.js
@@ -457,56 +457,60 @@ describe('app module', function () {
     })
   })
 
-  describe('getFileIcon() API', function() {
+  describe('getFileIcon() API', function () {
     const iconPath = path.join(process.cwd(), 'fixtures/assets/icon.ico')
     const sizes = {
       small: 16,
       normal: 32,
       large: 48
-    };
+    }
 
-    it('fetches non-empty icon', function(done) {
-      app.getFileIcon(iconPath, function(err, icon) {
+    it('fetches non-empty icon', function (done) {
+      app.getFileIcon(iconPath, function (err, icon) {
         assert.equal(err, null)
         assert.equal(icon.isEmpty(), false)
         done()
       })
     })
 
-    it('fetches normal size by default', function(done) {
-      app.getFileIcon(iconPath, function(err, icon) {
+    it('fetches normal size by default', function (done) {
+      app.getFileIcon(iconPath, function (err, icon) {
         const size = icon.getSize()
+        assert.equal(err, null)
         assert.equal(size.height, sizes.normal)
         assert.equal(size.width, sizes.normal)
         done()
       })
     })
 
-    describe('size option', function() {
-      it('fetches small icons', function(done) {
-        app.getFileIcon(iconPath, { size: 'small' }, function(err, icon) {
+    describe('size option', function () {
+      it('fetches small icons', function (done) {
+        app.getFileIcon(iconPath, { size: 'small' }, function (err, icon) {
           const size = icon.getSize()
+          assert.equal(err, null)
           assert.equal(size.height, sizes.small)
           assert.equal(size.width, sizes.small)
           done()
         })
       })
 
-      it('fetches normal icons', function(done) {
-        app.getFileIcon(iconPath, { size: 'normal' }, function(err, icon) {
+      it('fetches normal icons', function (done) {
+        app.getFileIcon(iconPath, { size: 'normal' }, function (err, icon) {
           const size = icon.getSize()
+          assert.equal(err, null)
           assert.equal(size.height, sizes.normal)
           assert.equal(size.width, sizes.normal)
           done()
         })
       })
 
-      it('fetches large icons', function(done) {
+      it('fetches large icons', function (done) {
         if (process.platform === 'darwin') {
           done() // macOS does not support large icons
         }
-        app.getFileIcon(iconPath, { size: 'normal' }, function(err, icon) {
+        app.getFileIcon(iconPath, { size: 'normal' }, function (err, icon) {
           const size = icon.getSize()
+          assert.equal(err, null)
           assert.equal(size.height, sizes.normal)
           assert.equal(size.width, sizes.normal)
           done()