diff --git a/test/lib/pixi/core/Circle.js b/test/lib/pixi/core/Circle.js
new file mode 100644
index 0000000..e7cbd4d
--- /dev/null
+++ b/test/lib/pixi/core/Circle.js
@@ -0,0 +1,22 @@
+function pixi_core_Circle_confirmNewCircle(obj) {
+    var expect = chai.expect;
+
+    expect(obj).to.be.an.instanceof(PIXI.Circle);
+    expect(obj).to.respondTo('clone');
+    expect(obj).to.respondTo('contains');
+    expect(obj).to.respondTo('getBounds');
+
+    expect(obj).to.have.property('x', 0);
+    expect(obj).to.have.property('y', 0);
+    expect(obj).to.have.property('radius', 0);
+}
+
+function pixi_core_Circle_isBoundedByRectangle(obj, rect) {
+    var expect = chai.expect;
+
+    expect(rect).to.have.property('x', obj.x - obj.radius);
+    expect(rect).to.have.property('y', obj.y - obj.radius);
+
+    expect(rect).to.have.property('width', obj.radius * 2);
+    expect(rect).to.have.property('height', obj.radius * 2);
+}