Add Stock class tests

src/BuyTradeTest.java

@@ -7,12 +7,14 @@ class BuyTradeTest {
 	@Test
 	void buyTradeTest() {
 		Customer c = new Customer("c1");
-		BuyTrade buyTrade = new BuyTrade(1, c, 100, 200);
+		Stock stock = new Stock("Apple");
+		BuyTrade buyTrade = new BuyTrade(1, c, stock, 100, 200);
 		assertEquals(buyTrade.getCustomer().getId(), c.getId());
 		assertEquals(buyTrade.getPrice(), 200);
 		assertEquals(buyTrade.getQty(), 100);
 		assertEquals(buyTrade.getTime(), 1);
 		assertEquals(buyTrade.getType(), "BUY");
+		assertEquals(buyTrade.getStock().getName(), "Apple");
 	}
 
 }

src/SellTradeTest.java

@@ -7,12 +7,14 @@ class SellTradeTest {
 	@Test
 	void sellTradeTest() {
 		Customer c = new Customer("c1");
-		SellTrade sellTrade = new SellTrade(1, c, 100, 200);
+		Stock stock = new Stock("Apple");
+		SellTrade sellTrade = new SellTrade(1, c, stock, 100, 200);
 		assertEquals(sellTrade.getCustomer().getId(), c.getId());
 		assertEquals(sellTrade.getPrice(), 200);
 		assertEquals(sellTrade.getQty(), 100);
 		assertEquals(sellTrade.getTime(), 1);
 		assertEquals(sellTrade.getType(), "SELL");	
+		assertEquals(sellTrade.getStock().getName(), "Apple");
 	}
 
 }