test(async/unstable): add retry() tests (#6423)

async/unstable_retry_test.ts

@@ -3,6 +3,30 @@ import { assertEquals, assertRejects } from "@std/assert";
 import { retry } from "./unstable_retry.ts";
 import { RetryError } from "./retry.ts";
 
+Deno.test("retry() throws if maxTimeout is negative", async () => {
+  await assertRejects(
+    async () => await retry(() => {}, { maxTimeout: -1 }),
+    TypeError,
+    "Cannot retry as 'maxTimeout' must be positive: current value is -1",
+  );
+});
+
+Deno.test("retry() throws if minTimeout is bigger than maxTimeout", async () => {
+  await assertRejects(
+    async () => await retry(() => {}, { maxTimeout: 1, minTimeout: 2 }),
+    TypeError,
+    "Cannot retry as 'minTimeout' must be <= 'maxTimeout': current values 'minTimeout=2', 'maxTimeout=1'",
+  );
+});
+
+Deno.test("retry() throws if jitter is bigger than 1", async () => {
+  await assertRejects(
+    async () => await retry(() => {}, { jitter: 2 }),
+    TypeError,
+    "Cannot retry as 'jitter' must be <= 1: current value is 2",
+  );
+});
+
 Deno.test("retry() only retries errors that are retriable with `isRetriable` option", async () => {
   class HttpError extends Error {
     status: number;