"""
Ex. 3.28 from "A Primer on...".
Write functions min and max, to find the minimum 
and maximum value in a list. The exercise
does not ask us to write test functions, but these
are added examples. 
"""

def max(a):
    max_elem = a[0]
    for e in a[1:]:
        if e > max_elem:
            max_elem = e
    return max_elem

def min(a):
    min_elem = a[0]
    for e in a[1:]:
        if e < min_elem:
            min_elem = e
    return min_elem


def test_max():
    l = [1,3,5,2,1,-1,-2]
    expected = 5
    computed = max(l)
    success = expected == computed
    msg = f'Expected {expected}, got {computed}'
    assert success, msg

def test_min():
    l = [1,3,5,2,1,-1,-2]
    expected = -2
    computed = min(l)
    success = expected == computed
    msg = f'Expected {expected}, got {computed}'
    assert success, msg


"""
The example below shows how to use pytest to run both tests automatically, but you 
can also insert calls to test_min() and test_max() in this file and run it in the usual way.
"""


"""
Terminal> pytest maxmin_list.py 
===================================== test session starts ======================================
platform darwin -- Python 3.9.7, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: /Users/sundnes/Desktop/IN1900_9sep
plugins: anyio-2.2.0, mock-3.10.0, cov-3.0.0
collected 2 items                                                                              

maxmin_list.py ..                                                                        [100%]

====================================== 2 passed in 0.01s =======================================
"""