feat(): add comprehensive tests for Bitget Private and Public REST API endpoints

- Introduced new test files for private read and write endpoints, covering account, trade, funding, and futures functionalities.
- Added public API tests for server time, ticker, order book, and market trades - Enhanced error handling in tests with specific error codes and messages.
- Updated response utility functions to improve error response structure.
- Removed outdated broker tests to streamline the test suite.

test/public.test.ts

@@ -0,0 +1,76 @@
+import { RestClientV2 } from '../src/rest-client-v2';
+import { sucessEmptyResponseObject } from './response.util';
+
+describe('Bitget Public REST API Endpoints', () => {
+  const api = new RestClientV2();
+
+  describe('public endpoints', () => {
+    it('should succeed making a GET request without params', async () => {
+      const res = await api.getServerTime();
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should succeed making a GET request with params', async () => {
+      const res = await api.getSpotTicker({ symbol: 'BTCUSDT' });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return orderbook data', async () => {
+      const res = await api.getSpotOrderBookDepth({
+        symbol: 'BTCUSDT',
+        type: 'step0',
+        limit: '20',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return candles data', async () => {
+      const res = await api.getSpotCandles({
+        symbol: 'BTCUSDT',
+        granularity: '1min',
+        limit: '100',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return recent trades', async () => {
+      const res = await api.getSpotRecentTrades({
+        symbol: 'BTCUSDT',
+        limit: '20',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return historic trades', async () => {
+      const res = await api.getSpotHistoricTrades({
+        symbol: 'BTCUSDT',
+        limit: '20',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return funding rate data', async () => {
+      const res = await api.getFuturesCurrentFundingRate({
+        symbol: 'BTCUSDT',
+        productType: 'USDT-FUTURES',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return open interest data', async () => {
+      const res = await api.getFuturesOpenInterest({
+        symbol: 'BTCUSDT',
+        productType: 'USDT-FUTURES',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+
+    it('should return contract config', async () => {
+      const res = await api.getFuturesContractConfig({
+        symbol: 'BTCUSDT',
+        productType: 'USDT-FUTURES',
+      });
+      expect(res).toMatchObject(sucessEmptyResponseObject());
+    });
+  });
+});