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test(js): Cover idempotency key reuse across POST retries #2401

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Merged
svix-jplatte merged 1 commit into from
Jun 24, 2026
+21 −0
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test(js): Cover idempotency key reuse across POST retries #2401

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21 changes: 21 additions & 0 deletions javascript/src/mockttp.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -470,6 +470,27 @@ test("mockttp tests", async (t) => {
assert(idempotencyKey.startsWith("auto_"));
});

await t.test("POST retry reuses the same auto idempotency key", async () => {
const endpointMock = await mockServer
.forPost("/api/v1/app")
.thenReply(500, `{"code":"500","detail":"asd"}`);
const svx = new Svix("token", {
serverUrl: mockServer.url,
numRetries: 2,
});

await assert.rejects(svx.application.create({ name: "test app" }), ApiException);

const requests = await endpointMock.getSeenRequests();
assert.equal(requests.length, 3);

const idempotencyKey = requests[0].headers["idempotency-key"] as string;
assert(idempotencyKey.startsWith("auto_"));

for (const request of requests) {
assert.equal(request.headers["idempotency-key"], idempotencyKey);
}
});
await t.test("test client provided idempotency key is not overridden", async () => {
const endpointMock = await mockServer
.forPost("/api/v1/app")
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