Release Privacy Tools 0.1.0

tests/privacy/detect.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  detectKind,
+  fileExtension,
+  inventoryIdentity,
+} from "../../src/privacy";
+import { jpegFixture, pngFixture, webpFixture } from "../fixtures/images";
+
+describe("file identity", () => {
+  it("detects supported containers from bytes", () => {
+    expect(detectKind(jpegFixture())).toBe("jpeg");
+    expect(detectKind(pngFixture())).toBe("png");
+    expect(detectKind(webpFixture())).toBe("webp");
+    expect(detectKind(Uint8Array.from([0x25, 0x50, 0x44, 0x46, 0x2d]))).toBe(
+      "pdf",
+    );
+  });
+
+  it("normalizes leaf extensions without trusting paths", () => {
+    expect(fileExtension("folder\\PHOTO.JPEG")).toBe("jpeg");
+    expect(fileExtension(".hidden")).toBe("");
+    expect(fileExtension("no-extension")).toBe("");
+  });
+
+  it("reports claimed and extension mismatches", () => {
+    const identity = inventoryIdentity(
+      "portrait.jpg",
+      "image/jpeg",
+      pngFixture(),
+    );
+    expect(identity).toMatchObject({
+      detectedKind: "png",
+      detectedType: "image/png",
+      typeMatch: "mismatch",
+    });
+  });
+
+  it("does not infer an unknown payload from its extension", () => {
+    const identity = inventoryIdentity(
+      "claim.png",
+      "image/png",
+      Uint8Array.from([1, 2, 3]),
+    );
+    expect(identity.detectedKind).toBe("unknown");
+    expect(identity.typeMatch).toBe("unknown");
+  });
+});