claudegoodies
Skill

tdd-rust

From rtk-ai

TDD workflow for RTK filter development. Red-Green-Refactor with Rust idioms. Real fixtures, token savings assertions, snapshot tests with insta. Auto-triggers on new filter implementation.

Facts

Repository
rtk-ai/rtk
Status
Actively maintained
Last commit
Declared tools
Source file
.claude/skills/tdd-rust/SKILL.md

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The instructions Claude Code reads when this skill runs.

# RTK TDD Workflow

Enforce Red-Green-Refactor for all RTK filter development.

## The Loop

```
1. RED   — Write failing test with real fixture
2. GREEN — Implement minimum code to pass
3. REFACTOR — Clean up, verify still passing
4. SAVINGS — Verify ≥60% token reduction
5. SNAPSHOT — Lock output format with insta
```

## Step 1: Real Fixture First

Never write synthetic test data. Capture real command output:

```bash
# Capture real output from the actual command
git log -20 > tests/fixtures/git_log_raw.txt
cargo test 2>&1 > tests/fixtures/cargo_test_raw.txt
cargo clippy 2>&1 > tests/fixtures/cargo_clippy_raw.txt
gh pr view 42 > tests/fixtures/gh_pr_view_raw.txt

# For commands with ANSI codes — capture as-is
script -q /dev/null cargo test 2>&1 > tests/fixtures/cargo_test_ansi_raw.txt
```

Fixture naming: `tests/fixtures/<command>_raw.txt`

## Step 2: Write the Test (Red)

```rust
#[cfg(test)]
mod tests {
    use super::*;
    use insta::assert_snapshot;

    fn count_tokens(s: &str) -> usize {
        s.split_whitespace().count()
    }

    // Test 1: Output format (snapshot)
    #[test]
    fn test_filter_output_format() {
        let input = include_str!("../tests/fixtures/mycmd_raw.txt");
        let output = filter_mycmd(input).expect("filter should not fail");
        assert_snapshot!(output);
    }

    // Test 2: Token savings ≥60%
    #[test]
    fn test_token_saving
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