Companinon crate to ‘BinTest’, implements test facilities

Description

A TestCall uses BinTest and std::process::Command to wrap process execution in a way that is ergonomic to use for (repeated) testing. Few more test facilities are provided and will grow in future.

Example

```rust

[test]

fn myprogram_test() { let executables = BinTest::new(); let mut myprogram = TestCall::new(&executables, "myprogram");

myprogram.current_dir(Box::new(TempDir::new().expect("created tempdir")));
myprogram
    .call(["--help"])
    .assert_success();

} ```

Future Plans

New features will be added as needed, PR’s are welcome. This is work in progress.

Things to be done soon are:

• Regex filters for the stdout/stderr
• Populating TestDirs from template directories
• Validating directory contents