Add message counting and date-bounded scrapes

media-scrape/test/slopbot.ts

@@ -6,6 +6,7 @@
 import assert from "node:assert/strict";
 import { SlopbotBackend, type SlopbotFetcher } from "../slopbot/backend.js";
 import { mapSlopbotMessage } from "../slopbot/backend.js";
+import { countMessages } from "../slopbot/client.js";
 
 let failures = 0;
 
@@ -138,6 +139,35 @@ void (async () => {
         assert.equal(mapped.forwarded[0].attachments[0].filename, "clip.webm");
     });
 
+    await test("countMessages reads guild search totals", async () => {
+        const calls: string[] = [];
+        const rest = {
+            async get(path: string, options?: { query?: URLSearchParams }) {
+                calls.push(`${path}?${options?.query?.toString() ?? ""}`);
+                return { total_results: 7 };
+            }
+        };
+
+        const count = await countMessages(rest, {
+            channelId: "1",
+            guildId: "2",
+            afterId: "100",
+            beforeId: "200"
+        });
+        assert.equal(count, 7);
+        assert.equal(calls[0], "/guilds/2/messages/search?channel_id=1&limit=1&min_id=100&max_id=200");
+
+        const failed = await countMessages(
+            {
+                async get() {
+                    throw new Error("nope");
+                }
+            },
+            { channelId: "1", guildId: "2" }
+        );
+        assert.equal(failed, null);
+    });
+
     await test("backend pages oldest first and passes before and limit", async () => {
         const fetcher = new FakeFetcher([
             [discordMessage({ id: "1002" }), discordMessage({ id: "1001" })],