expand spot public tests, fix broken trades and server time endpoints

test/spot/public.test.ts

@@ -12,7 +12,7 @@ describe('Public Spot REST API Endpoints', () => {
   });
 
   const symbol = 'BTCUSDT';
-  const interval = '15';
+  const interval = '15m';
   const timestampOneHourAgo = new Date().getTime() / 1000 - 1000 * 60 * 60;
   const from = Number(timestampOneHourAgo.toFixed(0));
 
@@ -34,4 +34,48 @@ describe('Public Spot REST API Endpoints', () => {
       successResponseObject(null)
     );
   });
+
+  it('getMergedOrderBook()', async () => {
+    expect(await api.getMergedOrderBook(symbol)).toMatchObject(
+      successResponseObject(null)
+    );
+  });
+
+  it('getTrades()', async () => {
+    expect(await api.getTrades(symbol)).toMatchObject(
+      successResponseObject(null)
+    );
+  });
+
+  it('getCandles()', async () => {
+    expect(await api.getCandles(symbol, interval)).toMatchObject(
+      successResponseObject(null)
+    );
+  });
+
+  it('get24hrTicker()', async () => {
+    expect(await api.get24hrTicker()).toMatchObject(
+      successResponseObject(null)
+    );
+  });
+
+  it('getLastTradedPrice()', async () => {
+    expect(await api.getLastTradedPrice()).toMatchObject(
+      successResponseObject(null)
+    );
+  });
+
+  it('getBestBidAskPrice()', async () => {
+    expect(await api.getBestBidAskPrice()).toMatchObject(
+      successResponseObject(null)
+    );
+  });
+
+  it('getServerTime()', async () => {
+    expect(await api.getServerTime()).toStrictEqual(expect.any(Number));
+  });
+
+  it('fetchServertime() returns number', async () => {
+    expect(await api.fetchServerTime()).toStrictEqual(expect.any(Number));
+  });
 });