Make activity conform to testing standards.

Author: JASchilz

test.py tests.py

@@ -1,8 +1,20 @@
+"""
+streams-exercise.tests.py
+
+This file is intentionally written without the benefit of the Python
+unittest library. This can be used to demonstrate in-class that unit testing
+is a simple concept which benefits from the use of a library, but does not
+require it.
+
+Run with `python tests.py`. The return code will be the number of test failures.
+"""
+
 import io
 
 from stream_exercise import StreamProcessor
 
-score = 0
+
+failures = 0
 
 
 value = "234761640930110349378289194"
@@ -11,7 +23,7 @@
 result = my_stream_processor.process()
 
 success = result == expected
-score += success
+failures += (not success)
 message = "Testing \"{}\", expected {} got {}. ".format(value, expected, result)
 message += "SUCCESS" if success else "FAILURE"
 print(message)
@@ -23,7 +35,7 @@
 result = my_stream_processor.process()
 
 success = result == expected
-score += success
+failures += (not success)
 message = "Testing \"{}\", expected {} got {}. ".format(value, expected, result)
 message += "SUCCESS" if success else "FAILURE"
 print(message)
@@ -35,7 +47,7 @@
 result = my_stream_processor.process()
 
 success = result == expected
-score += success
+failures += (not success)
 message = "Testing \"{}\", expected {} got {}. ".format(value, expected, result)
 message += "SUCCESS" if success else "FAILURE"
 print(message)
@@ -47,7 +59,7 @@
 result = my_stream_processor.process()
 
 success = result == expected
-score += success
+failures += (not success)
 message = "Testing \"{}\", expected {} got {}. ".format(value, expected, result)
 message += "SUCCESS" if success else "FAILURE"
 print(message)
@@ -59,10 +71,12 @@
 result = my_stream_processor.process()
 
 success = result == expected
-score += success
+failures += (not success)
 message = "Testing \"{}\", expected {} got {}. ".format(value, expected, result)
 message += "SUCCESS" if success else "FAILURE"
 print(message)
 
 
-print("\n\nScore: {} of 5".format(score))
+
+print("\n\nTest failures: {} ".format(failures))
+exit(failures)