diff --git a/spec/python_tricks/chapter03_spec.py b/spec/python_tricks/chapter03_spec.py
new file mode 100644
index 0000000..b76a131
--- /dev/null
+++ b/spec/python_tricks/chapter03_spec.py
@@ -0,0 +1,13 @@
+from mamba import description, it, context, fit
+from expects import expect, equal, raise_error
+
+
+def yell(text):
+    return text.upper() + '!'
+
+
+with description('Chapter03') as self:
+    with context('functions'):
+        with it("first class citizens"):
+            result = yell('hello')
+            expect(result).to(equal('HELLO!'))