> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sourcery.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# No-Loop-In-Tests

#### Sourcery rule id: `no-loop-in-tests`

#### Description

Avoid loops in tests.



#### Match

```python
def test_something():
    some_code()
    for i in range(len(currencies)):
        verify(currencies[i])
```



#### Explanation

Avoid complex code, like loops, in test functions.

Google's software engineering guidelines says:
"Clear tests are trivially correct upon inspection"
To reach that avoid complex code in tests:
* loops
* conditionals

Some ways to fix this:

* Use parametrized tests to get rid of the loop.
* Move the complex logic into helpers.
* Move the complex part into pytest fixtures.

> Complexity is most often introduced in the form of logic. Logic is defined via the imperative parts of programming languages such as operators, loops, and conditionals. When a piece of code contains logic, you need to do a bit of mental computation to determine its result instead of just reading it off of the screen. It doesn't take much logic to make a test more difficult to reason about.

Software Engineering at Google / [Don't Put Logic in Tests](https://abseil.io/resources/swe-book/html/ch12.html#donapostrophet_put_logic_in_tests)