Write Tests

Context

Current changes to write tests for:

!jj show

Task

Review the current changes and write tests following docs/development/testing.md and docs/development/code-style.md. Validate your work using mise run test and ensure all code is properly formatted using mise run format.

Style Guidelines

No inline comments - Tests should be self-documenting through clear variable names and structure.

Setup + space + assertion - Separate setup from assertions with a blank line:

#[test]
fn it_does_a_thing() {
    let foo = "foo";
    let bar = "bar";

    assert_ne!(foo, bar);
}

#[test]
fn multiple_assertions() {
    let foo = "foo";
    let bar = "bar";

    assert_ne!(foo, bar);

    let baz = "baz";

    assert_ne!(foo, baz);
}

When a test has multiple logical steps, separate each setup+assertion group with a blank line.