chore: establish TechLog migration baseline

tests/features/tech-log/migration-baseline.test.ts

@@ -0,0 +1,71 @@
+import { createHash } from "node:crypto";
+import { existsSync, readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+import { describe, expect, it } from "vitest";
+
+const publicDirectory = resolve(process.cwd(), "public");
+
+const approvedSvgAssets = [
+  {
+    relativePath: "favicon.svg",
+    sha256: "e6d2e59b7b5bbb0342e0fb496dfc262decbfe4426bbb7b047aec8d467d1dc6f7",
+  },
+  {
+    relativePath: "media/fetch-strategy-boundary.svg",
+    sha256: "b07926823ed77fc200f962a1f64a440e130cefa6bed31144b611612af9b02606",
+  },
+] as const;
+
+const localEvidenceAssets = {
+  "fetch-strategy-boundary": {
+    src: "/media/fetch-strategy-boundary.svg",
+    width: 1080,
+    height: 420,
+    triggerLabel: "Fetch Join과 Batch Fetch 비교 다이어그램 크게 보기",
+    dialogLabel: "Fetch Join과 Batch Fetch의 페이징 경계 확대",
+  },
+} as const;
+
+function getLocalEvidenceAsset(key: string) {
+  const asset = localEvidenceAssets[key as keyof typeof localEvidenceAssets];
+  if (!asset) {
+    throw new Error(`Unknown local evidence asset: ${key}`);
+  }
+
+  return asset;
+}
+
+function sha256(filePath: string) {
+  return createHash("sha256").update(readFileSync(filePath)).digest("hex");
+}
+
+describe("TechLog migration baseline", () => {
+  it("preserves each approved SVG asset byte-for-byte", () => {
+    for (const asset of approvedSvgAssets) {
+      const assetPath = resolve(publicDirectory, asset.relativePath);
+
+      expect(existsSync(assetPath), asset.relativePath).toBe(true);
+      expect(sha256(assetPath), asset.relativePath).toBe(asset.sha256);
+    }
+  });
+
+  it("resolves the fetch strategy evidence to its published asset contract", () => {
+    expect(getLocalEvidenceAsset("fetch-strategy-boundary")).toEqual({
+      src: "/media/fetch-strategy-boundary.svg",
+      width: 1080,
+      height: 420,
+      triggerLabel: "Fetch Join과 Batch Fetch 비교 다이어그램 크게 보기",
+      dialogLabel: "Fetch Join과 Batch Fetch의 페이징 경계 확대",
+    });
+
+    const evidencePath = resolve(
+      publicDirectory,
+      getLocalEvidenceAsset("fetch-strategy-boundary").src.slice(1),
+    );
+    expect(existsSync(evidencePath)).toBe(true);
+    expect(sha256(evidencePath)).toBe(
+      "b07926823ed77fc200f962a1f64a440e130cefa6bed31144b611612af9b02606",
+    );
+  });
+});