story-kit: merge 69_story_test_coverage_qa_gate

script/test_coverage

@@ -0,0 +1,120 @@
+#!/usr/bin/env bash
+# Test coverage collection and threshold enforcement.
+#
+# Runs Rust tests with llvm-cov and frontend tests with vitest --coverage.
+# Reports line coverage percentages for each.
+#
+# Threshold: reads from COVERAGE_THRESHOLD env var, or .coverage_baseline file.
+# Default: 0% (any coverage passes; baseline is written on first run).
+#
+# Coverage can only go up: if current coverage is above the stored baseline,
+# the baseline is updated automatically.
+#
+# Exit codes:
+#   0 — all coverage at or above threshold
+#   1 — coverage below threshold
+
+set -uo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+BASELINE_FILE="$PROJECT_ROOT/.coverage_baseline"
+
+# ── Load threshold ────────────────────────────────────────────────────────────
+if [ -n "${COVERAGE_THRESHOLD:-}" ]; then
+    THRESHOLD="$COVERAGE_THRESHOLD"
+elif [ -f "$BASELINE_FILE" ]; then
+    THRESHOLD=$(cat "$BASELINE_FILE")
+else
+    THRESHOLD=0
+fi
+
+echo "=== Coverage threshold: ${THRESHOLD}% ==="
+echo ""
+
+PASS=true
+RUST_LINE_COV=0
+FRONTEND_LINE_COV=0
+
+# ── Rust coverage ─────────────────────────────────────────────────────────────
+echo "=== Running Rust tests with coverage ==="
+RUST_REPORT=""
+if cargo llvm-cov --version >/dev/null 2>&1; then
+    RUST_REPORT=$(cargo llvm-cov \
+        --manifest-path "$PROJECT_ROOT/Cargo.toml" \
+        --summary-only \
+        2>&1) || true
+    echo "$RUST_REPORT"
+
+    # Parse the TOTAL line: columns are space-separated with % on coverage cols.
+    # Format: TOTAL <regions> <missed> <cover%> <funcs> <missed> <exec%> <lines> <missed> <cover%> ...
+    # We want field 10 (lines cover %).
+    RUST_RAW=$(echo "$RUST_REPORT" | awk '/^TOTAL/ { print $10 }' | tr -d '%')
+    if [ -n "$RUST_RAW" ]; then
+        RUST_LINE_COV="$RUST_RAW"
+    fi
+else
+    echo "cargo-llvm-cov not available; skipping Rust coverage"
+fi
+echo "Rust line coverage: ${RUST_LINE_COV}%"
+echo ""
+
+# ── Frontend coverage ─────────────────────────────────────────────────────────
+echo "=== Running frontend tests with coverage ==="
+FRONTEND_DIR="$PROJECT_ROOT/frontend"
+FRONTEND_LINE_COV=0
+if [ -d "$FRONTEND_DIR" ]; then
+    FRONTEND_REPORT=$(cd "$FRONTEND_DIR" && pnpm run test:coverage 2>&1) || true
+    echo "$FRONTEND_REPORT"
+
+    # Parse "All files" line from vitest coverage text table.
+    # Format: All files | % Stmts | % Branch | % Funcs | % Lines | ...
+    FRONTEND_RAW=$(echo "$FRONTEND_REPORT" | awk -F'|' '/All files/ { gsub(/ /, "", $5); print $5 }' | head -1)
+    if [ -n "$FRONTEND_RAW" ]; then
+        FRONTEND_LINE_COV="$FRONTEND_RAW"
+    fi
+else
+    echo "No frontend/ directory found; skipping frontend coverage"
+fi
+echo "Frontend line coverage: ${FRONTEND_LINE_COV}%"
+echo ""
+
+# ── Overall (average of available measurements) ───────────────────────────────
+if [ "$RUST_LINE_COV" != "0" ] && [ "$FRONTEND_LINE_COV" != "0" ]; then
+    OVERALL=$(awk "BEGIN { printf \"%.1f\", ($RUST_LINE_COV + $FRONTEND_LINE_COV) / 2 }")
+elif [ "$RUST_LINE_COV" != "0" ]; then
+    OVERALL="$RUST_LINE_COV"
+elif [ "$FRONTEND_LINE_COV" != "0" ]; then
+    OVERALL="$FRONTEND_LINE_COV"
+else
+    OVERALL=0
+fi
+
+# ── Summary ───────────────────────────────────────────────────────────────────
+echo "=== Coverage Summary ==="
+echo "  Rust:     ${RUST_LINE_COV}%"
+echo "  Frontend: ${FRONTEND_LINE_COV}%"
+echo "  Overall:  ${OVERALL}%"
+echo "  Threshold: ${THRESHOLD}%"
+echo ""
+
+# ── Threshold check ───────────────────────────────────────────────────────────
+if awk "BEGIN { exit (($OVERALL + 0) < ($THRESHOLD + 0)) ? 0 : 1 }"; then
+    echo "FAIL: Coverage ${OVERALL}% is below threshold ${THRESHOLD}%"
+    PASS=false
+else
+    echo "PASS: Coverage ${OVERALL}% meets threshold ${THRESHOLD}%"
+fi
+
+# ── Update baseline when coverage improves ────────────────────────────────────
+if [ "$PASS" = "true" ]; then
+    STORED_BASELINE="${THRESHOLD}"
+    if awk "BEGIN { exit (($OVERALL + 0) > ($STORED_BASELINE + 0)) ? 0 : 1 }"; then
+        echo "${OVERALL}" > "$BASELINE_FILE"
+        echo "Baseline updated: ${STORED_BASELINE}% → ${OVERALL}%"
+    fi
+fi
+
+if [ "$PASS" = "false" ]; then
+    exit 1
+fi

server/src/agents.rs

@@ -537,7 +537,8 @@ impl AgentPool {
     ///
     /// - **Coder** + gates passed → move story to `work/3_qa/`, start `qa` agent.
     /// - **Coder** + gates failed → restart the same coder agent with failure context.
-    /// - **QA** + gates passed → move story to `work/4_merge/`, start `mergemaster` agent.
+    /// - **QA** + gates passed + coverage passed → move story to `work/4_merge/`, start `mergemaster` agent.
+    /// - **QA** + gates passed + coverage failed → restart `qa` with coverage failure context.
     /// - **QA** + gates failed → restart `qa` with failure context.
     /// - **Mergemaster** → run `script/test` on master; if pass: archive + cleanup worktree;
     ///   if fail: restart `mergemaster` with failure context.
@@ -545,7 +546,7 @@ impl AgentPool {
     async fn run_pipeline_advance_for_completed_agent(&self, story_id: &str, agent_name: &str) {
         let key = composite_key(story_id, agent_name);
 
-        let (completion, project_root) = {
+        let (completion, project_root, worktree_path) = {
             let agents = match self.agents.lock() {
                 Ok(a) => a,
                 Err(e) => {
@@ -557,7 +558,11 @@ impl AgentPool {
                 Some(a) => a,
                 None => return,
             };
-            (agent.completion.clone(), agent.project_root.clone())
+            let wt_path = agent
+                .worktree_info
+                .as_ref()
+                .map(|wt| wt.path.clone());
+            (agent.completion.clone(), agent.project_root.clone(), wt_path)
         };
 
         let completion = match completion {
@@ -618,8 +623,24 @@ impl AgentPool {
             }
             PipelineStage::Qa => {
                 if completion.gates_passed {
+                    // Run coverage gate in the QA worktree before advancing to merge.
+                    let coverage_path = worktree_path.clone().unwrap_or_else(|| project_root.clone());
+                    let cp = coverage_path.clone();
+                    let coverage_result =
+                        tokio::task::spawn_blocking(move || run_coverage_gate(&cp))
+                            .await
+                            .unwrap_or_else(|e| {
+                                eprintln!("[pipeline] Coverage gate task panicked: {e}");
+                                Ok((false, format!("Coverage gate task panicked: {e}")))
+                            });
+                    let (coverage_passed, coverage_output) = match coverage_result {
+                        Ok(pair) => pair,
+                        Err(e) => (false, e),
+                    };
+
+                    if coverage_passed {
                         eprintln!(
-                        "[pipeline] QA passed gates for '{story_id}'. Moving to merge."
+                            "[pipeline] QA passed gates and coverage for '{story_id}'. Moving to merge."
                         );
                         if let Err(e) = move_story_to_merge(&project_root, story_id) {
                             eprintln!("[pipeline] Failed to move '{story_id}' to 4_merge/: {e}");
@@ -631,6 +652,23 @@ impl AgentPool {
                         {
                             eprintln!("[pipeline] Failed to start mergemaster for '{story_id}': {e}");
                         }
+                    } else {
+                        eprintln!(
+                            "[pipeline] QA coverage gate failed for '{story_id}'. Restarting QA."
+                        );
+                        let context = format!(
+                            "\n\n---\n## Coverage Gate Failed\n\
+                             The coverage gate (script/test_coverage) failed with the following output:\n{}\n\n\
+                             Please improve test coverage until the coverage gate passes.",
+                            coverage_output
+                        );
+                        if let Err(e) = self
+                            .start_agent(&project_root, story_id, Some("qa"), Some(&context))
+                            .await
+                        {
+                            eprintln!("[pipeline] Failed to restart qa for '{story_id}': {e}");
+                        }
+                    }
                 } else {
                     eprintln!(
                         "[pipeline] QA failed gates for '{story_id}'. Restarting."
@@ -1353,6 +1391,36 @@ fn run_acceptance_gates(path: &Path) -> Result<(bool, String), String> {
     Ok((all_passed, all_output))
 }
 
+/// Run `script/test_coverage` in the given directory if the script exists.
+///
+/// Used as a QA gate before advancing a story from `3_qa/` to `4_merge/`.
+/// Returns `(passed, output)`.  If the script does not exist, returns `(true, …)`.
+fn run_coverage_gate(path: &Path) -> Result<(bool, String), String> {
+    let script = path.join("script").join("test_coverage");
+    if !script.exists() {
+        return Ok((
+            true,
+            "script/test_coverage not found; coverage gate skipped.\n".to_string(),
+        ));
+    }
+
+    let mut output = String::from("=== script/test_coverage ===\n");
+    let result = Command::new(&script)
+        .current_dir(path)
+        .output()
+        .map_err(|e| format!("Failed to run script/test_coverage: {e}"))?;
+
+    let combined = format!(
+        "{}{}",
+        String::from_utf8_lossy(&result.stdout),
+        String::from_utf8_lossy(&result.stderr)
+    );
+    output.push_str(&combined);
+    output.push('\n');
+
+    Ok((result.status.success(), output))
+}
+
 // ── Mergemaster helpers ───────────────────────────────────────────────────────
 
 /// Squash-merge a feature branch into the current branch in the project root.
@@ -2351,4 +2419,77 @@ mod tests {
         assert!(!passed, "script/test exiting 1 should fail");
         assert!(output.contains("script/test"), "output should mention script/test");
     }
+
+    // ── run_coverage_gate tests ───────────────────────────────────────────────
+
+    #[cfg(unix)]
+    #[test]
+    fn coverage_gate_passes_when_script_absent() {
+        use tempfile::tempdir;
+        let tmp = tempdir().unwrap();
+        let (passed, output) = run_coverage_gate(tmp.path()).unwrap();
+        assert!(passed, "coverage gate should pass when script is absent");
+        assert!(
+            output.contains("not found"),
+            "output should mention script not found"
+        );
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn coverage_gate_passes_when_script_exits_zero() {
+        use std::fs;
+        use std::os::unix::fs::PermissionsExt;
+        use tempfile::tempdir;
+
+        let tmp = tempdir().unwrap();
+        let path = tmp.path();
+        let script_dir = path.join("script");
+        fs::create_dir_all(&script_dir).unwrap();
+        let script = script_dir.join("test_coverage");
+        fs::write(
+            &script,
+            "#!/usr/bin/env bash\necho 'Rust line coverage: 85%'\necho 'PASS: Coverage 85% meets threshold 0%'\nexit 0\n",
+        )
+        .unwrap();
+        let mut perms = fs::metadata(&script).unwrap().permissions();
+        perms.set_mode(0o755);
+        fs::set_permissions(&script, perms).unwrap();
+
+        let (passed, output) = run_coverage_gate(path).unwrap();
+        assert!(passed, "coverage gate should pass when script exits 0");
+        assert!(
+            output.contains("script/test_coverage"),
+            "output should mention script/test_coverage"
+        );
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn coverage_gate_fails_when_script_exits_nonzero() {
+        use std::fs;
+        use std::os::unix::fs::PermissionsExt;
+        use tempfile::tempdir;
+
+        let tmp = tempdir().unwrap();
+        let path = tmp.path();
+        let script_dir = path.join("script");
+        fs::create_dir_all(&script_dir).unwrap();
+        let script = script_dir.join("test_coverage");
+        fs::write(
+            &script,
+            "#!/usr/bin/env bash\necho 'FAIL: Coverage 40% is below threshold 80%'\nexit 1\n",
+        )
+        .unwrap();
+        let mut perms = fs::metadata(&script).unwrap().permissions();
+        perms.set_mode(0o755);
+        fs::set_permissions(&script, perms).unwrap();
+
+        let (passed, output) = run_coverage_gate(path).unwrap();
+        assert!(!passed, "coverage gate should fail when script exits 1");
+        assert!(
+            output.contains("script/test_coverage"),
+            "output should mention script/test_coverage"
+        );
+    }
 }