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"""Run it by
python3 -m unittest sin_test
import unittest
import numpy as np
from numpy.testing import assert_allclose, assert_array_equal
def is_snake(word):
if not word.isalpha():
raise ValueError("String '{}' is not a word")
if word.lower() == 'python':
return True
if word.lower() == 'питон':
return True
return False
def plus(a, b):
return a + b
class PlusTestCase(unittest.TestCase):
def test_type(self):
with self.assertRaises(TypeError):
plus(1, 'a')
self.assertTrue(isinstance('a', str))
class SinTestCase(unittest.TestCase):
"""Tests np.sin"""
def test_zero(self):
"""sin(0) == 0"""
x = 0
y = 0
self.assertEqual(np.sin(x), y)
def test_half_pi(self):
"""sin(pi/2) == 1"""
x = np.pi / 2
y = 1
self.assertEqual(np.sin(x), y,
msg='sin pi/2 should be equal unity')
def test_trig(self):
x = np.linspace(0, 1, 11)
sin = np.sin(x)
cos = np.cos(x)
assert_allclose(1-cos**2, sin**2, rtol=1e-7, atol=1e-5)
class IsSnake(unittest.TestCase):
def test_python(self):
self.assertTrue(is_snake('python'), msg='python is a snake')
def test_dog(self):