Assertion tools

In this section, we collect the most important tools for raising an AssertionError. We saw the assert command and two tools from unittest, namely assertAlmostEqual. The following table (Table 13.1) summarizes the most important assertion tools and the related modules:

Assertion tool and application example

Module

assert 5==5

–

assertEqual(5.27, 5.27)

unittest.TestCase

assertAlmostEqual(5.24, 5.2,places = 1)

 unittest.TestCase

assertTrue(5 > 2)

unittest.TestCase

assertFalse(2 < 5)

unittest.TestCase

assertRaises(ZeroDivisionError,lambda x: 1/x,0.)

unittest.TestCase

assertIn(3,{3,4})

unittest.TestCase

assert_array_equal(A,B)

numpy.testing

assert_array_almost_equal(A, B, decimal=5)

numpy.testing

assert_allclose(A, B, rtol=1.e-3,atol=1.e-5)

numpy.testing

Table 13.1: Assertion tools in Python, unittest and NumPy

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