Create stake.cs-e2e.ts (#1407)

* Create stake.cs-e2e.ts

* Update stake.cs-e2e.ts

src/test/chain-simulator/stake.cs-e2e.ts

@@ -0,0 +1,52 @@
+import axios from "axios";
+import { config } from "./config/env.config";
+import { ChainSimulatorUtils } from "./utils/test.utils";
+
+describe('Stake e2e tests with chain simulator', () => {
+  beforeAll(async () => {
+    await ChainSimulatorUtils.waitForEpoch(2);
+  });
+
+  describe('GET /stake', () => {
+    let stakeResponse: any;
+
+    beforeEach(async () => {
+      stakeResponse = await axios.get(`${config.apiServiceUrl}/stake`);
+    });
+
+    it('should return status code 200 and a stake object', () => {
+      expect(stakeResponse.status).toBe(200);
+      expect(stakeResponse.data).toBeInstanceOf(Object);
+    });
+
+    it('should return the correct total number of validators', () => {
+      expect(stakeResponse.data.totalValidators).toBeGreaterThanOrEqual(0);
+    });
+
+    it('should return the correct number of active validators', () => {
+      expect(stakeResponse.data.activeValidators).toBeGreaterThanOrEqual(0);
+    });
+
+    it('should return the correct number of total observers', () => {
+      expect(stakeResponse.data.totalObservers).toBeGreaterThanOrEqual(0);
+    });
+
+    it('should return the correct queue size', () => {
+      expect(stakeResponse.data.queueSize).toBeGreaterThanOrEqual(0);
+    });
+
+    it('should return all expected properties in the response', () => {
+      const expectedProperties = [
+        'totalValidators',
+        'activeValidators',
+        'totalObservers',
+        'queueSize',
+        'totalStaked',
+      ];
+
+      for (const property of expectedProperties) {
+        expect(stakeResponse.data).toHaveProperty(property);
+      }
+    });
+  });
+});