To test the performance of `count_weekend_days()` function, there are several approaches.
One way is to use a built-in module `timeit` in Python, which is included in the standard Python distribution.
It provides a simple way to time small bits of Python code.
Here are the steps to test the performance of `count_weekend_days()` function:

**Using Python's timeit module:**

1. Import the timeit module in Python.
2. Define a function that calls count_weekend_days() function.
3. Use the timeit.Timer() function to create a timer object that measures the time taken by the function.
4. Call the timeit() function on the timer object to get the time taken by the function.

Here's an example Python code snippet:
```
import timeit

def test_count_weekend_days():
    # call count_weekend_days() function here
    
t = timeit.Timer("test_count_weekend_days()", "from __main__ import test_count_weekend_days")
print(t.timeit())

```
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