A mock function returning a sum of param_a and param_b if positive numbers, else None
Parameters
Another *test* _param_.
| col A |: col B |
|-------|--------|
| boo | baa more content across broken line|
Returns
The sum of _param_a_ and _param_b_.
None returned if values are negative.
Raises
Raises value error if params are not numbers.
Examples
```python
print(mock_function(1, 2))
# prints 3
print("boo")
print('boo')
```
Random text
_Random table_
| col A |: col B |
|-------|--------|
| boo | baa |