NFT-000: add integ test

integration-test/sdk.polygon.gasstation.test-integration.ts

@@ -0,0 +1,27 @@
+import { config as loadEnv } from 'dotenv';
+
+import axios from 'axios';
+
+loadEnv();
+
+describe('E2E Test: Sdk (read)', () => {
+  // fix to avoid axios open handle
+  beforeEach(async () => {
+    await process.nextTick(() => {});
+  });
+
+  describe('It should get gas price from gasstation', () => {
+    it('Should resolve gassation url correctly', async () => {
+      const { data } = await axios({
+        method: 'get',
+        url: 'https://gasstation.polygon.technology/v2',
+      });
+      const gas = data.fast;
+      expect(gas).toBeDefined;
+      expect(gas).toMatchObject({
+        maxPriorityFee: expect.anything(),
+        maxFee: expect.anything(),
+      });
+    });
+  });
+});