Added approvals version of python test

python/README.md

@@ -7,7 +7,7 @@ Suggestion: create a python virtual environment for this project. See the [docum
 ## Run the unit tests from the Command-Line
 
 ```
-python test_gilded_rose.py
+python tests/test_gilded_rose.py
 ```
 
 ## Run the TextTest fixture from the Command-Line
@@ -27,3 +27,13 @@ There are instructions in the [TextTest Readme](../texttests/README.md) for sett
 
     executable:${TEXTTEST_HOME}/python/texttest_fixture.py
     interpreter:python
+
+## Run the ApprovalTests.Python test
+
+This test uses the framework [ApprovalTests.Python](https://github.com/approvals/ApprovalTests.Python). Run it like this:
+
+```
+python tests/test_gilded_rose_approvals.py
+```
+
+You will need to approve the output file which appears under "approved_files" by renaming it from xxx.received.txt to xxx.approved.txt.

python/tests/approvaltests_config.json

@@ -0,0 +1,3 @@
+{
+  "subdirectory": "approved_files"
+}

python/tests/test_gilded_rose_approvals.py

@@ -0,0 +1,21 @@
+import io
+import sys
+
+from approvaltests import verify
+from texttest_fixture import main
+
+def test_gilded_rose_approvals():
+    orig_sysout = sys.stdout
+    try:
+        fake_stdout = io.StringIO()
+        sys.stdout = fake_stdout
+        sys.argv = ["texttest_fixture.py", 30]
+        main()
+        answer = fake_stdout.getvalue()
+    finally:
+        sys.stdout = orig_sysout
+
+    verify(answer)
+
+if __name__ == "__main__":
+    test_gilded_rose_approvals()

python/texttest_fixture.py

@@ -3,8 +3,9 @@ from __future__ import print_function
 
 from gilded_rose import *
 
-if __name__ == "__main__":
-    print ("OMGHAI!")
+
+def main():
+    print("OMGHAI!")
     items = [
         Item(name="+5 Dexterity Vest", sell_in=10, quality=20),
         Item(name="Aged Brie", sell_in=2, quality=0),
@@ -16,7 +17,6 @@ if __name__ == "__main__":
         Item(name="Backstage passes to a TAFKAL80ETC concert", sell_in=5, quality=49),
         Item(name="Conjured Mana Cake", sell_in=3, quality=6),  # <-- :O
     ]
-
     days = 2
     import sys
     if len(sys.argv) > 1:
@@ -28,3 +28,7 @@ if __name__ == "__main__":
             print(item)
         print("")
         GildedRose(items).update_quality()
+
+
+if __name__ == "__main__":
+    main()