Make mock-ea test output deterministic (#4165)

* Make mock-ea test output deterministic

* changeset

Author: dskloetc

.changeset/hungry-numbers-buy.md

@@ -0,0 +1,5 @@
+---
+'@chainlink/mock-ea-adapter': minor
+---
+
+Only start deviating after the first response, which is now always 1000.

packages/sources/mock-ea/README.md

@@ -60,9 +60,9 @@ Response:
 {
   "jobRunID": "1",
   "data": {
-    "result": 950
+    "result": 1000
   },
-  "result": 950,
+  "result": 1000,
   "statusCode": 200
 }
 ```

packages/sources/mock-ea/src/endpoint/price.ts

@@ -1,5 +1,4 @@
-import { Requester, Validator } from '@chainlink/ea-bootstrap'
-import { ExecuteWithConfig, InputParameters } from '@chainlink/ea-bootstrap'
+import { ExecuteWithConfig, InputParameters, Requester, Validator } from '@chainlink/ea-bootstrap'
 import { ExtendedConfig } from '../config'
 
 export const supportedEndpoints = ['price']
@@ -28,7 +27,9 @@ export const execute: ExecuteWithConfig<ExtendedConfig> = async (request, _, con
   const jobRunID = validator.validated.id
   const lastUpdated = responseInfo.lastUpdated
   const now = Date.now()
-  if (!lastUpdated || now - lastUpdated >= config.updateIntervalInMS) {
+  if (!lastUpdated) {
+    responseInfo.lastUpdated = now
+  } else if (now - lastUpdated >= config.updateIntervalInMS) {
     const amountToDeviate = (config.deviationAmount * responseInfo.result) / 100
     responseInfo.result =
       now % 2 === 0 ? responseInfo.result + amountToDeviate : responseInfo.result - amountToDeviate

packages/sources/mock-ea/test/integration/adapter.test.ts

@@ -1,8 +1,8 @@
 import { AdapterRequest } from '@chainlink/ea-bootstrap'
-import { server as startServer } from '../../src'
-import { setupExternalAdapterTest } from '@chainlink/ea-test-helpers'
 import type { SuiteContext } from '@chainlink/ea-test-helpers'
+import { setupExternalAdapterTest } from '@chainlink/ea-test-helpers'
 import { SuperTest, Test } from 'supertest'
+import { server as startServer } from '../../src'
 
 describe('execute', () => {
   const id = '1'
@@ -27,7 +27,7 @@ describe('execute', () => {
         .set('Content-Type', 'application/json')
         .expect('Content-Type', /json/)
         .expect(200)
-      expect([950, 1050]).toContain(response.body.data.result)
+      expect(response.body.data.result).toBe(1000)
     })
   })
 })