2 Ways To Use Python Unittest AssertRaises In Python
Example 1 Let s start with a very simple example for python unittest assertraises We have a function that raises a ValueError if the input value is negative def raise if negative value if value lt 0 raise ValueError Value cannot be negative We can write a test for this using assertRaises
Unittest Unit Testing Framework Python 3 11 5 , unittest Unit testing framework Basic example Command Line Interface Command line options Test Discovery Organizing test code Re using old test code Skipping tests and expected failures Distinguishing test iterations using subtests Classes and functions Test cases Deprecated aliases Grouping tests Loading and running tests
Python How To Properly Use Unit testing s AssertRaises With
The usual way to use assertRaises is to call a function self assertRaises TypeError test function args to test that the function call test function args raises a TypeError The problem with self testListNone 1 is that Python evaluates the expression immediately before the assertRaises method is called
Unit Testing How Do You Test That A Python Function Throws An , Use TestCase assertRaises or TestCase failUnlessRaises from the unittest module for example import mymod class MyTestCase unittest TestCase def test1 self self assertRaises SomeCoolException mymod myfunc
Unit Testing Python Unittest AssertRaises Stack Overflow
Unit Testing Python Unittest AssertRaises Stack Overflow, python unittest assertRaises I copied this verbatim from python unittest documentation import random import unittest class TestSequenceFunctions unittest TestCase def setUp self self seq range 10 def test shuffle self make sure the shuffled sequence does not lose any elements random shuffle self seq
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Python How To Use Unittest s Self assertRaises With Exceptions
Python How To Use Unittest s Self assertRaises With Exceptions assertRaises is a context manager since Python 2 7 so you can do it like this class testExample unittest TestCase def test generatorExample self with self assertRaises RuntimeError list Example generatorExample If you have Python lt 2 7 then you can use a lambda to exhaust the generator
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SHOW ERROR MESSAGES True class NonexistantError Exception pass class ExtendedTestCase unittest TestCase def assertRaises self excClass callableObj args kwargs if SHOW ERROR MESSAGES excClass NonexistantError try unittest TestCase assertRaises self excClass callableObj args kwargs except Python How To Show The Error Messages Caught By AssertRaises . assertRaises exception function args kwargs Asserts that function args kwargs raises the exception For a complete list of assertion methods refer to the unittest docs To run these tests we should run unittest as the main module using the following command python m unittest lt module name gt py Self assertRaises expects a function mro setStatus followed by an arbitrary number of arguments in this case just NEW STATUS self assertRaises assembles its arguments into the function call mro setStatus NEW STATUS inside a try except block thus catching and recording the ValueError if it occurs
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