fix: reduce Slack WebClient retries

src/slack/client.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("@slack/web-api", () => {
+  const WebClient = vi.fn(function WebClientMock(
+    this: Record<string, unknown>,
+    token: string,
+    options?: Record<string, unknown>,
+  ) {
+    this.token = token;
+    this.options = options;
+  });
+  return { WebClient };
+});
+
+const slackWebApi = await import("@slack/web-api");
+const { createSlackWebClient, resolveSlackWebClientOptions, SLACK_DEFAULT_RETRY_OPTIONS } =
+  await import("./client.js");
+
+const WebClient = slackWebApi.WebClient as unknown as ReturnType<typeof vi.fn>;
+
+describe("slack web client config", () => {
+  it("applies the default retry config when none is provided", () => {
+    const options = resolveSlackWebClientOptions();
+
+    expect(options.retryConfig).toEqual(SLACK_DEFAULT_RETRY_OPTIONS);
+  });
+
+  it("respects explicit retry config overrides", () => {
+    const customRetry = { retries: 0 };
+    const options = resolveSlackWebClientOptions({ retryConfig: customRetry });
+
+    expect(options.retryConfig).toBe(customRetry);
+  });
+
+  it("passes merged options into WebClient", () => {
+    createSlackWebClient("xoxb-test", { timeout: 1234 });
+
+    expect(WebClient).toHaveBeenCalledWith(
+      "xoxb-test",
+      expect.objectContaining({
+        timeout: 1234,
+        retryConfig: SLACK_DEFAULT_RETRY_OPTIONS,
+      }),
+    );
+  });
+});