Improving Installer and Updater Process

src/tests/update-download.test.ts

@@ -56,3 +56,38 @@ test("downloadInstaller rejects insecure production download URLs", async () =>
     /unsupported protocol/,
   );
 });
+
+test("downloadInstaller reuses existing file if size matches and does not download again", async () => {
+  const tempDirectory = fs.mkdtempSync(path.join(os.tmpdir(), "scoreko-update-download-"));
+  const downloadDirectory = path.join(tempDirectory, "scoreko-updates");
+  fs.mkdirSync(downloadDirectory, { recursive: true });
+
+  const installerPath = path.join(downloadDirectory, "Scoreko_setup_0.2.0.exe");
+  fs.writeFileSync(installerPath, "cached-installer-bytes");
+  const cachedSize = fs.statSync(installerPath).size;
+
+  const previousFetch = globalThis.fetch;
+  globalThis.fetch = async () => {
+    throw new Error("Should not fetch when using cached file!");
+  };
+
+  try {
+    const resultPath = await downloadInstaller(
+      {
+        version: "0.2.0",
+        title: "Scoreko 0.2.0",
+        installer: {
+          name: "Scoreko/setup:0.2.0.exe",
+          downloadUrl: "https://updates.local/Scoreko-setup-0.2.0.exe",
+          size: cachedSize,
+        },
+      },
+      { tempDirectory, allowInsecureHttp: false },
+    );
+
+    assert.equal(resultPath, installerPath);
+    assert.equal(fs.readFileSync(resultPath, "utf8"), "cached-installer-bytes");
+  } finally {
+    globalThis.fetch = previousFetch;
+  }
+});