test: blank-Supabase venue driver with an expected-failures gate (GIT-83)

tests/e2e/blank-supabase-netlog.mjs

@@ -0,0 +1,42 @@
+/**
+ * Preload for tests/e2e/blank-supabase.mjs (loaded via NODE_OPTIONS=--import).
+ *
+ * Wraps globalThis.fetch in the gitmem server process and appends one JSON line
+ * per request to $GITMEM_NETLOG: method, host, path, status, and the size of the
+ * response body as the process received it (decoded — an upper bound on wire bytes
+ * when the response was gzip'd). Request bodies are never logged; auth headers
+ * are never logged.
+ */
+import { appendFileSync } from "node:fs";
+
+const LOG = process.env.GITMEM_NETLOG;
+const realFetch = globalThis.fetch;
+
+if (LOG && realFetch) {
+  globalThis.fetch = async function netlogFetch(input, init) {
+    const url = new URL(typeof input === "string" ? input : input.url ?? String(input));
+    const method = (init?.method || (typeof input === "object" && input.method) || "GET").toUpperCase();
+    const started = Date.now();
+    let response;
+    try {
+      response = await realFetch(input, init);
+    } catch (err) {
+      appendFileSync(LOG, JSON.stringify({ t: started, method, host: url.host, path: url.pathname, status: 0, bytes: 0, error: String(err).slice(0, 200) }) + "\n");
+      throw err;
+    }
+    const contentLength = response.headers.get("content-length");
+    const encoding = response.headers.get("content-encoding");
+    response
+      .clone()
+      .arrayBuffer()
+      .then((buf) => {
+        appendFileSync(LOG, JSON.stringify({
+          t: started, ms: Date.now() - started, method, host: url.host, path: url.pathname,
+          query: url.search.slice(0, 160), status: response.status, bytes: buf.byteLength,
+          content_length: contentLength ? Number(contentLength) : null, encoding,
+        }) + "\n");
+      })
+      .catch(() => {});
+    return response;
+  };
+}