"""
This is code that is copy-and-pasted in the slides.
"""


def test_arithmetic():
    assert 1 == 1
    assert 2 * 3 == 6

def test_len_list():
    lst = ['a', 'b', 'c']
    assert len(lst) == 3

def test_various():
    assert 'Hi'.islower()
    assert 2 + 1 == 3
    assert [2] + [1] == [2, 1]
    assert 'a' + 'b' != 'ab'


def test_1_and_2():
    assert 1 + 2 == 3

def test_1_and_2_float():
    assert 1.1 + 2.2 == 3.3


from math import isclose

def test_floating_point_math():
    assert isclose(1.1 + 2.2, 3.3)

def test_floating_point_math2():
    assert isclose(1.121, 1.2, abs_tol=1e-1)
    assert isclose(1.121, 1.2, abs_tol=1e-2)

def test_floating_point_math3():
    assert isclose(120.1, 121.4, rel_tol=1e-1)
    assert isclose(120.4, 121.4, rel_tol=1e-2)

import numpy

def test_numpy_equality():
    x = numpy.array([1, 1])
    y = numpy.array([2, 2])
    z = numpy.array([3, 3])
    assert x + y == z


from py.test import raises

class SomeException(Exception):
    pass


do_something = do_something_else = lambda : 1


def test_raises():
    with raises(SomeException):
        do_something()
        do_something_else()


def test_raises2():
    with raises(ValueError):
        int('XYZ')


def test_lower():
    # Given
    string = 'HeLlO wOrld'
    expected = 'hello world'

    # When
    output = string.lower()

    # Then
    assert output == expected


def test_lower_empty_string():
    # Given
    string = ''
    expected = ''

    # When
    output = string.lower()

    # Then
    assert output == expected


def test_lower1():
    # Given
    # Each test case is a tuple of (input, expected_result)
    test_cases = [('HeLlO wOrld', 'hello world'),
                  ('hi', 'hi'),
                  ('123 ([?', '123 ([?'),
                  ('', '')]

    for string, expected in test_cases:
        # When
        output = string.lower()
        # Then
        assert output == expected