Questions

• Questions about Assignment 3?

Getting Started

• Make a directory ~/cs2613/labs/L14

- Download Work.zip and unzip in your newly created directory.

Pytest

• In a terminal run

    pipx install --include-deps unb-cs2613
    rehash
  

• Save the following sample code (based on Exercise 1.19) to a file listex.py in the directory you created above.

symbols = 'HPQ,AAPL,IBM,MSFT,YHOO,DOA,GOOG'
symlist = symbols.split(',')

def test_lookup0():
    assert symlist[0] == 'HPQ'

def test_lookup1():
    assert symlist[1] == 'AAPL'

• In ~/cs2613/labs/L14, run

    pytest listex.py
  

• You should see

[student@id414m22 L14]$ pytest listex.py
=================== test session starts ===================
platform linux -- Python 3.9.18, pytest-7.4.3, pluggy-1.3.0
rootdir: /home1/ugrad/student/cs2613/labs/L14
plugins: pylama-8.4.1, cov-4.1.0
collected 2 items

listex.py ..                                        [100%]

==================== 2 passed in 0.02s ====================

• Modify one of the tests so it fails. Run pytest again.

• Question to think about: what are three ways failing tests are indicated?

Lists and Pytest

• For each of the remaining interactive evaluations in Exercise 1.19, add a corresponding test to listex.py.

• make sure each test_* function (def) has a unique name.

• if you want, you can have multiple asserts in a single test.

• Questions to think about:

  • what are some differences between == in JavaScript and Python?
  • based on what you have seen so far, what are similarities and differences between the node test framework and pytest

Functions and coverage

We have already been using python functions for pytest, without really thinking about how they work. In Part 1.7 of Practical Python, functions are explained.

• Consider the sumcount function

def sumcount(n):
    '''
    Returns the sum of the first n integers
    '''
    total = 0
    while n > 0:
        total += n
        n -= 1
    return total

• Make a recursive version of this function.

• Add sufficient pytest tests for both versions of the function.

• Check your test(s) for coverage with

    pytest --cov=sum --cov-report=term-missing sum.py
  

  (assuming your file is called sum.py)

Files

• Do Exercise 1.26.

• Convert the interactive demos to pytest tests. You can replace print with appending to a list.

Data types

Tuples

• Exercise 2.1 Convert the interactive demos to pytest tests. You can replace print` with appending to a list.

Before next lab