This directory is for source code unit tests that need test extras, such as test data files.
This directory is an organizational pattern that aligns the source code path `./src` and tests path `./tests/src`
For this file:
```sh
src/mymodule/myfile.rs
```
Put any test extras here:
```sh
tests/src/mymodule/myfile/
```
For this function:
```rust
fn myfunction()
```
Put any test extras here:
```sh
tests/src/mymodule/myfile/myfunction/
```