feat: add extensive test suite

app/api/active/handler.ts

@@ -0,0 +1,36 @@
+type VersionFile = {
+  exists: () => Promise<boolean>;
+  text: () => Promise<string>;
+  write: (value: string) => Promise<unknown>;
+};
+
+export function createActiveHandler(dependencies: {
+  file: VersionFile;
+  randomUUID: () => string;
+  isDevelopment: () => boolean;
+  stream: (options: {
+    motd: { data: string; event: string };
+    signal: AbortSignal;
+  }) => Response | Promise<Response>;
+}) {
+  return async function GET(req: Request) {
+    let version = "DEV";
+    if (!dependencies.isDevelopment()) {
+      if (!(await dependencies.file.exists())) {
+        version = dependencies.randomUUID();
+        await dependencies.file.write(version);
+      } else {
+        version = await dependencies.file.text();
+        if (!version) {
+          version = dependencies.randomUUID();
+          await dependencies.file.write(version);
+        }
+      }
+    }
+
+    return dependencies.stream({
+      motd: { data: version, event: "version" },
+      signal: req.signal,
+    });
+  };
+}