Pass

Nobody has claimed this yet.

_I recognise the struggle, därför får du inte komplettering._

## Komplettering (egentligen inte) (som den hade sett ut)

**Almost there!**

To get _Pass_, I would like you to
1) Test all of the basic piece movements.
2) Test piece capture.
3) Include `assert` macros in your current tests to actually make them functional.

Tips:
```rust
let mut row_string: String = match row {
0 => "A",
1 => "B",
2 => "C",
3 => "D",
4 => "E",
5 => "F",
6 => "G",
7 => "H",
_ => "A",
}
.to_owned();

let col_string: &str = match column {
0 => "1",
1 => "2",
2 => "3",
3 => "4",
4 => "5",
5 => "6",
6 => "7",
7 => "8",
_ => "1",
};

row_string.push_str(&col_string);
row_string
```
can be reduced to
```rust
let mut row =
// Convert index as a hexdecimal digit.
std::char::from_digit((
if row < 8 { row } else { 0 }
) + 10, 16).unwrap();

format!("{}{}", row, (if column < 8 { column } else { 0 }) + 1)
```

Start by locating the current Rust tests and the code implementing basic piece movement, capture, and coordinate formatting. Run the existing test suite, then add coverage for every basic movement and capture case and make the current tests use assert macros; done means these behaviors are verified by passing tests.

Written by the indexing model from the issue text.