Eroman: Created page with "= Test Result Output = == Example Code == `app.py` def get_hello_world_1(): return "Hello World!" def get_hello_world_2(): """Ret..."

2017-06-06T09:26:25Z

Created page with "= Test Result Output = == Example Code == <code>app.py</code> <source lang="python">def get_hello_world_1(): return "Hello World!" def get_hello_world_2(): """Ret..."

New page

= Test Result Output =

== Example Code ==

<code>app.py</code>

<source lang="python">def get_hello_world_1():
return "Hello World!"

def get_hello_world_2():
"""Returns wrong text"""
return "Wrong Text."

def get_hello_world_3():
"""Will raise an error when run"""
return hello_world</source>
<code>test_app.py</code>

<source lang="python">import app
import unittest

class HelloWorld1TestCase(unittest.TestCase):
def test_value(self):
result = app.get_hello_world_1()
self.assertEqual("Hello World!", result)

class HelloWorld2TestCase(unittest.TestCase):
def test_value(self):
result = app.get_hello_world_2()
self.assertEqual("Hello World!", result)

class HelloWorld3TestCase(unittest.TestCase):
def test_value(self):
result = app.get_hello_world_3()
self.assertEqual("Hello World!", result)

</source>
== Output ==

<pre>.FE
======================================================================
ERROR: test_value (test_app.HelloWorld3TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/tmp/test_app.py", line 19, in test_value
result = app.get_hello_world_3()
File "/tmp/app.py", line 12, in get_hello_world_3
return hello_world
NameError: name 'hello_world' is not defined

======================================================================
FAIL: test_value (test_app.HelloWorld2TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/tmp/test_app.py", line 14, in test_value
self.assertEqual("Hello World!", result)
AssertionError: 'Hello World!' != 'Wrong Text.'
- Hello World!
+ Wrong Text.

----------------------------------------------------------------------
Ran 3 tests in 0.001s

FAILED (failures=1, errors=1)
</pre>
=== Overview ===

* <code>.</code> is a passing test
* <code>F</code> is a failure
* <code>E</code> is an error

NOTE: The test results do not appear in a consistent order.

=== Passing Test ===

Since the assertion -- <code>assertEqual</code> -- is called with 'Hello World!' and 'Hello World!', no error is raised.

=== Failing Test ===

<code>FAIL: test_value (test_app.HelloWorld2TestCase)</code>

* <code>FAIL</code>, means the test failed
* <code>test_value</code> is the name of the method in the TestCase
* <code>test_app.HelloWorld2TestCase</code> is the python path to the TestCase

The assertion -- <code>assertEqual</code> -- is called with 'Hello World!' and 'Wrong Text.'. These two strings are not equal, so <code>assertEqual</code> raises an <code>AssertionError</code>. When an <code>AssertionError</code> is raised, the test fails.

You will see in the <code>FAIL</code> test result the values used. This is helpful to figure out what went wrong.

=== Error ===

The function -- <code>get_hello_world_3</code> raises a <code>NameError</code>, since the name 'hello_world' is not defined. When an error is raised, and the error is NOT an <code>AssertionError</code>, then the test result is a special failure called an "error".

I719 Fundamentals of Python/test results - Revision history

Eroman: Created page with "= Test Result Output = == Example Code == app.py def get_hello_world_1(): return "Hello World!" def get_hello_world_2(): """Ret..."

Eroman: Created page with "= Test Result Output = == Example Code == `app.py` def get_hello_world_1(): return "Hello World!" def get_hello_world_2(): """Ret..."