diff --git a/test/unit/specs/directives/internal/class_spec.js b/test/unit/specs/directives/internal/class_spec.js
index e38d6d10dc7..44e3858d291 100644
--- a/test/unit/specs/directives/internal/class_spec.js
+++ b/test/unit/specs/directives/internal/class_spec.js
@@ -53,6 +53,8 @@ describe(':class', function () {
     expect(el.className).toBe('a b c')
     dir.update(['d', 'c'])
     expect(el.className).toBe('a c d')
+    dir.update(['w', 'x y z'])
+    expect(el.className).toBe('a w x y z')
     dir.update()
     expect(el.className).toBe('a')
     // test mutating array
@@ -64,13 +66,13 @@ describe(':class', function () {
     dir.update(arr)
     expect(el.className).toBe('a f')
     // test array with objects
-    dir.update(['x', {y: true, z: true}])
+    dir.update(['x', { y: true, z: true }])
     expect(el.className).toBe('a x y z')
-    dir.update(['x', {y: true, z: false}])
+    dir.update(['x', { y: true, z: false }])
     expect(el.className).toBe('a x y')
-    dir.update(['f', {z: true}])
+    dir.update(['f', { z: true }])
     expect(el.className).toBe('a f z')
-    dir.update(['l', 'f', {n: true, z: true}])
+    dir.update(['l', 'f', { n: true, z: true }])
     expect(el.className).toBe('a f z l n')
     dir.update(['x', {}])
     expect(el.className).toBe('a x')