Using a gem package called zsteg to solve door 3.

tests/test_luke03.py

@@ -1,2 +1,11 @@
+from luke_03.steganography import main
+
 def test_answer():
-   assert False 
+   answer = 'Steganography is awesome and you Knowit!'
+   output = main()
+   print(output)
+   print(answer in output)
+   if answer in output:
+      assert True
+   else:
+      assert False