test(operate): document the delay and eventual consistency measure in…

… test

src/__tests__/operate/operate-integration.spec.ts

@@ -60,8 +60,13 @@ test('getJSONVariablesforProcess works', async () => {
 		},
 	})
 
+	// Wait for Operate to catch up.
 	await new Promise((res) => setTimeout(() => res(null), 7000))
-
+	// Make sure that the process instance exists in Operate.
+	const process = await c.getProcessInstance(p.processInstanceKey)
+	// If this fails, it is probably a timing issue.
+	// Operate is eventually consistent, so we need to wait a bit.
+	expect(process.key).toBe(p.processInstanceKey)
 	const res = await c.getJSONVariablesforProcess(p.processInstanceKey)
 	expect(res.foo).toBe('bar')
 })