fix: centralize source reply delivery mode

test/scripts/testbox-sync-sanity.test.ts

@@ -0,0 +1,76 @@
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import {
+  evaluateTestboxSyncSanity,
+  parseGitShortStatus,
+} from "../../scripts/testbox-sync-sanity.mjs";
+
+describe("testbox sync sanity", () => {
+  it("parses tracked deletions from git short status", () => {
+    expect(
+      parseGitShortStatus(
+        " D pnpm-lock.yaml\nD  package.json\n?? scratch.txt\nR  old.ts -> new.ts\n",
+      ),
+    ).toEqual([
+      {
+        line: " D pnpm-lock.yaml",
+        path: "pnpm-lock.yaml",
+        status: " D",
+        trackedDeletion: true,
+      },
+      {
+        line: "D  package.json",
+        path: "package.json",
+        status: "D ",
+        trackedDeletion: true,
+      },
+      {
+        line: "?? scratch.txt",
+        path: "scratch.txt",
+        status: "??",
+        trackedDeletion: false,
+      },
+      {
+        line: "R  old.ts -> new.ts",
+        path: "new.ts",
+        status: "R ",
+        trackedDeletion: false,
+      },
+    ]);
+  });
+
+  it("fails before a gate when critical repo files disappeared", () => {
+    const result = evaluateTestboxSyncSanity({
+      cwd: "/repo",
+      statusRaw: "",
+      exists: (file) => path.basename(file) !== "pnpm-lock.yaml",
+    });
+
+    expect(result.ok).toBe(false);
+    expect(result.problems).toContain("missing required root files: pnpm-lock.yaml");
+  });
+
+  it("fails on mass tracked deletions unless explicitly allowed", () => {
+    const statusRaw = Array.from({ length: 3 }, (_, index) => ` D file-${index}.ts`).join("\n");
+    const result = evaluateTestboxSyncSanity({
+      cwd: "/repo",
+      statusRaw,
+      deletionThreshold: 3,
+      exists: () => true,
+    });
+
+    expect(result.ok).toBe(false);
+    expect(result.trackedDeletionCount).toBe(3);
+    expect(result.problems[0]).toContain("remote git status has 3 tracked deletions");
+
+    expect(
+      evaluateTestboxSyncSanity({
+        cwd: "/repo",
+        statusRaw,
+        deletionThreshold: 3,
+        allowMassDeletions: true,
+        exists: () => true,
+      }).ok,
+    ).toBe(true);
+  });
+});