refactor: share slack allowlist resolver scaffolding

src/slack/resolve-allowlist-common.test.ts

@@ -0,0 +1,70 @@
+import { describe, expect, it, vi } from "vitest";
+import {
+  collectSlackCursorItems,
+  resolveSlackAllowlistEntries,
+} from "./resolve-allowlist-common.js";
+
+describe("collectSlackCursorItems", () => {
+  it("collects items across cursor pages", async () => {
+    type MockPage = {
+      items: string[];
+      response_metadata?: { next_cursor?: string };
+    };
+    const fetchPage = vi
+      .fn()
+      .mockResolvedValueOnce({
+        items: ["a", "b"],
+        response_metadata: { next_cursor: "cursor-1" },
+      })
+      .mockResolvedValueOnce({
+        items: ["c"],
+        response_metadata: { next_cursor: "" },
+      });
+
+    const items = await collectSlackCursorItems<string, MockPage>({
+      fetchPage,
+      collectPageItems: (response) => response.items,
+    });
+
+    expect(items).toEqual(["a", "b", "c"]);
+    expect(fetchPage).toHaveBeenCalledTimes(2);
+  });
+});
+
+describe("resolveSlackAllowlistEntries", () => {
+  it("handles id, non-id, and unresolved entries", () => {
+    const results = resolveSlackAllowlistEntries({
+      entries: ["id:1", "name:beta", "missing"],
+      lookup: [
+        { id: "1", name: "alpha" },
+        { id: "2", name: "beta" },
+      ],
+      parseInput: (input) => {
+        if (input.startsWith("id:")) {
+          return { id: input.slice("id:".length) };
+        }
+        if (input.startsWith("name:")) {
+          return { name: input.slice("name:".length) };
+        }
+        return {};
+      },
+      findById: (lookup, id) => lookup.find((entry) => entry.id === id),
+      buildIdResolved: ({ input, match }) => ({ input, resolved: true, name: match?.name }),
+      resolveNonId: ({ input, parsed, lookup }) => {
+        const name = (parsed as { name?: string }).name;
+        if (!name) {
+          return undefined;
+        }
+        const match = lookup.find((entry) => entry.name === name);
+        return match ? { input, resolved: true, name: match.name } : undefined;
+      },
+      buildUnresolved: (input) => ({ input, resolved: false }),
+    });
+
+    expect(results).toEqual([
+      { input: "id:1", resolved: true, name: "alpha" },
+      { input: "name:beta", resolved: true, name: "beta" },
+      { input: "missing", resolved: false },
+    ]);
+  });
+});