Invoking pytest from CLI

Introduzione al Testing in Python

Alexander Levin

Data Scientist

Example CLI run: syntax

Command-Line Interface (CLI) - a user interface that allows to interact with a computer program by entering text commands into a terminal.

The command for running the slides.py from CLI:

pytest slides.py

Meaning: "Please, run the pytest framework using the tests from the slides.py module"

Output of a test:

test output example

Output of a test:

test output example - versions highligted

Output of a test:

test output example - collected highligted

Output of a test:

test output example - names of test scripts highligted

Output of a test:

test output example - results highligted

IDE example

IDE example with arrows

The command for running all tests in tests_dir/:

pytest tests_dir/

Meaning: "Please, run the pytest framework using all found the tests from the tests_dir folder".

directory tests output

The command for running tests from tests_ex.py contains "squared":

pytest tests_ex.py -k "squared"

Meaning: "Please, run the pytest framework using all tests from the tests_ex.py script containing squared".

Output: keyword tests output

IDE exercises - let us to write code in an Integrated Development Environment and to use command-line interface (CLI)
CLI pytest command starts with pytest
Sources of tests:
- One script, by passing script_name.py
- A set of scripts from one folder, by passing directory_name/
Keyword argument:
- By passing -k "keyword_expression"
Output of a test contains important information about the run

Introduzione al Testing in Python