diff --git a/test/unit/pixi/display/DisplayObjectContainer.js b/test/unit/pixi/display/DisplayObjectContainer.js
index 61698d4..15a3376 100644
--- a/test/unit/pixi/display/DisplayObjectContainer.js
+++ b/test/unit/pixi/display/DisplayObjectContainer.js
@@ -18,7 +18,7 @@
         expect(obj).to.have.property('stage', null);
     });
 
-    it('Gets child position', function() {
+    it('Gets child index', function() {
         var container = new PIXI.DisplayObjectContainer();
         var children = [];
         for (var i = 0; i < 10; i++) {
@@ -32,7 +32,14 @@
         }
     });
 
-    it('Sets child position', function() {
+    it('throws error when trying to get index of not a child', function() {
+        var container = new PIXI.DisplayObjectContainer();
+        var child = new PIXI.DisplayObject();
+
+        expect(function() { container.getChildIndex(child); }).to.throw();
+    });
+
+    it('Sets child index', function() {
         var container = new PIXI.DisplayObjectContainer();
         var children = [];
 
@@ -48,4 +55,13 @@
             expect(i).to.eql(container.getChildIndex(children[i]));
         }
     });
+
+      it('throws error when trying to set incorect index', function() {
+        var container = new PIXI.DisplayObjectContainer();
+        var child = new PIXI.DisplayObject();
+        container.addChild(child);
+
+        expect(function() { container.setChildIndex(child, -1); }).to.throw();
+        expect(function() { container.setChildIndex(child, 1); }).to.throw();
+    });
 });