Add analyzer tests

packages/skin-database/analyzer.test.ts

@@ -0,0 +1,29 @@
+import fsPromises from "fs";
+import path from "path";
+import * as Analyzer from "./analyser";
+import JSZip from "jszip";
+
+test("getReadme", async () => {
+  const zip = await getSkinZip("Sonic_Attitude.wsz");
+  const readme = await Analyzer.getReadme(zip);
+  if (readme == null) {
+    throw new Error("Expected to find readme.");
+  }
+  expect(readme.length).toBe(387);
+  expect(readme.split("\n")[0].trim()).toMatchInlineSnapshot(
+    `"SONIC ATTITUDE - By LuigiHann (luigihann@aol.com)"`
+  );
+});
+
+test("getSkinType", async () => {
+  const zip = await getSkinZip("Sonic_Attitude.wsz");
+  const skinType = await Analyzer.getSkinType(zip);
+  expect(skinType).toBe("CLASSIC");
+});
+
+function getSkinZip(filename: string): Promise<JSZip> {
+  const buffer = fsPromises.readFileSync(
+    path.join(__dirname, "../webamp/demo/skins/", filename)
+  );
+  return JSZip.loadAsync(buffer);
+}