diff --git a/src/test/testOrderBook.java b/src/test/testOrderBook.java
index 063dff6..cb71f33 100644
--- a/src/test/testOrderBook.java
+++ b/src/test/testOrderBook.java
@@ -3,6 +3,10 @@
 import OrderBook.Side;
 import org.junit.jupiter.api.Test;
 
+import static OrderBook.OrderType.MARKET_ORDER;
+import static OrderBook.OrderType.LIMIT_ORDER;
+import static OrderBook.OrderType.STOP_LIMIT_ORDER;
+
 import static org.junit.jupiter.api.Assertions.*;
 
 class testOrderBook {
@@ -168,4 +172,164 @@ void placeTwoAsk() {
 		assertEquals(-1f, testSubject.bestBidPrice);
 		assertEquals(1.8f, testSubject.sittingVolume);
 	}
+
+	@Test
+	void placeThreeBids() {
+		// Init and checking start conditions
+		OrderBook testSubject = new OrderBook();
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(0, testSubject.bids.size());
+		assertEquals(-1f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(0f, testSubject.sittingVolume);
+		//Operation
+		Order newBid = new Order(5.3f, 0.3f, Side.BID, 1677598183L);
+		testSubject.placeOrder(newBid);
+		//Checking Operation
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(1, testSubject.bids.size());
+		assertEquals(5.3f, testSubject.bids.getFirst().price);
+		assertEquals(0.3f, testSubject.bids.getFirst().size);
+		assertEquals(1677598183L, testSubject.bids.getFirst().createdTs);
+		assertEquals(-1f, testSubject.bestAskPrice);
+		assertEquals(5.3f, testSubject.bestBidPrice);
+		assertEquals(0.3f, testSubject.sittingVolume);
+		//Operation
+		Order newBid2 = new Order(8.1f, 1.1f, Side.BID, 1677598184L);
+		testSubject.placeOrder(newBid2);
+		//Checking Operation
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(2, testSubject.bids.size());
+		assertEquals(5.3f, testSubject.bids.getFirst().price);
+		assertEquals(0.3f, testSubject.bids.getFirst().size);
+		assertEquals(1677598183L, testSubject.bids.getFirst().createdTs);
+		assertEquals(8.1f, testSubject.bids.getLast().price);
+		assertEquals(1.1f, testSubject.bids.getLast().size);
+		assertEquals(1677598182L, testSubject.bids.getLast().createdTs);
+		assertEquals(-1f, testSubject.bestAskPrice);
+		assertEquals(8.1f, testSubject.bestBidPrice);
+		assertEquals(1.4f, testSubject.sittingVolume);
+		//Operation
+		Order newBid3 = new Order(2.0f, 1.0f, Side.BID, 1677598185L);
+		testSubject.placeOrder(newBid3);
+		//Checking Operation
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(3, testSubject.bids.size());
+		assertEquals(5.3f, testSubject.bids.getFirst().price);
+		assertEquals(0.3f, testSubject.bids.getFirst().size);
+		assertEquals(1677598183L, testSubject.bids.getFirst().createdTs);
+		assertEquals(2.0f, testSubject.bids.getLast().price);
+		assertEquals(1.0f, testSubject.bids.getLast().size);
+		assertEquals(1677598185L, testSubject.bids.getLast().createdTs);
+		assertEquals(-1f, testSubject.bestAskPrice);
+		assertEquals(8.1f, testSubject.bestBidPrice);
+		assertEquals(2.4f, testSubject.sittingVolume);
+	}
+
+	@Test
+	void placeOneLimitOrderAsk() {
+		// Init and checking start conditions
+		OrderBook testSubject = new OrderBook();
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(0, testSubject.bids.size());
+		assertEquals(-1f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(0f, testSubject.sittingVolume);
+		// Operation
+		Order newLIMIT = new Order("uuid", "product", 1.0f, 5.0f,
+				LIMIT_ORDER, false, Side.ASK, 1677598186L);
+		testSubject.placeOrder(newLIMIT);
+		// Checking Operation
+		assertEquals(1, testSubject.asks.size());
+		assertEquals(0, testSubject.bids.size());
+		assertEquals(1.0f, testSubject.asks.getFirst().size);
+		assertEquals(5.0f, testSubject.asks.getFirst().price);
+		assertEquals(1677598186L, testSubject.asks.getFirst().createdTs);
+		assertEquals(1.0f, testSubject.asks.getLast().size);
+		assertEquals(5.0f, testSubject.asks.getLast().price);
+		assertEquals(1677598186L, testSubject.asks.getLast().createdTs);
+		assertEquals(5.0f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(1.0f, testSubject.sittingVolume);
+	}
+
+	@Test
+	void placeOneLimitOrderAskOneMarketOrderAsk() {
+		// Init and checking start conditions
+		OrderBook testSubject = new OrderBook();
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(0, testSubject.bids.size());
+		assertEquals(-1f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(0f, testSubject.sittingVolume);
+		// Operation
+		Order newLimit = new Order("uuid", "product", 1.0f, 5.0f,
+				LIMIT_ORDER, false, Side.ASK, 1677598186L);
+		testSubject.placeOrder(newLimit);
+		// Checking Operation
+		assertEquals(1, testSubject.asks.size());
+		assertEquals(0, testSubject.bids.size());
+		assertEquals(1.0f, testSubject.asks.getFirst().size);
+		assertEquals(5.0f, testSubject.asks.getFirst().price);
+		assertEquals(1677598186L, testSubject.asks.getFirst().createdTs);
+		assertEquals(1.0f, testSubject.asks.getFirst().size);
+		assertEquals(5.0f, testSubject.asks.getFirst().price);
+		assertEquals(1677598186L, testSubject.asks.getFirst().createdTs);
+		assertEquals(5.0f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(1.0f, testSubject.sittingVolume);
+		// Operation
+		Order newMarket = new Order("uuid", "product", 2.0f, 10.0f,
+				MARKET_ORDER, false, Side.ASK, 1677598187L);
+		testSubject.placeOrder(newMarket);
+		// Checking Operation
+		assertEquals(2, testSubject.asks.size());
+		assertEquals(0, testSubject.bids.size());
+		assertEquals(1.0f, testSubject.asks.getFirst().size);
+		assertEquals(5.0f, testSubject.asks.getFirst().price);
+		assertEquals(1677598186L, testSubject.asks.getFirst().createdTs);
+		assertEquals(2.0f, testSubject.asks.getLast().size);
+		assertEquals(10.0f, testSubject.asks.getLast().price);
+		assertEquals(1677598187L, testSubject.asks.getLast().createdTs);
+		assertEquals(10.0f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(3.0f, testSubject.sittingVolume);
+	}
+
+	@Test
+	void placeTwoStopLimitBids(){
+		OrderBook testSubject = new OrderBook();
+		//Operation
+		Order newStopLimit = new Order("uuid", "product", 3.0f, 5.0f,
+				STOP_LIMIT_ORDER, false, Side.BID, 1677598188L);
+		testSubject.placeOrder(newStopLimit);
+		// Checking Operation
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(1, testSubject.bids.size());
+		assertEquals(3.0f, testSubject.asks.getFirst().size);
+		assertEquals(5.0f, testSubject.asks.getFirst().price);
+		assertEquals(1677598188L, testSubject.asks.getFirst().createdTs);
+		assertEquals(3.0f, testSubject.asks.getLast().size);
+		assertEquals(5.0f, testSubject.asks.getLast().price);
+		assertEquals(1677598188L, testSubject.asks.getLast().createdTs);
+		assertEquals(5.0f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(3.0f, testSubject.sittingVolume);
+		//Operation
+		Order newStopLimit2 = new Order("uuid", "product", 4.0f, 9.0f,
+				STOP_LIMIT_ORDER, false, Side.BID, 1677598189L);
+		testSubject.placeOrder(newStopLimit2);
+		// Checking Operation
+		assertEquals(0, testSubject.asks.size());
+		assertEquals(2, testSubject.bids.size());
+		assertEquals(3.0f, testSubject.asks.getFirst().size);
+		assertEquals(5.0f, testSubject.asks.getFirst().price);
+		assertEquals(1677598188L, testSubject.asks.getFirst().createdTs);
+		assertEquals(4.0f, testSubject.asks.getLast().size);
+		assertEquals(9.0f, testSubject.asks.getLast().price);
+		assertEquals(1677598189L, testSubject.asks.getLast().createdTs);
+		assertEquals(9.0f, testSubject.bestAskPrice);
+		assertEquals(-1f, testSubject.bestBidPrice);
+		assertEquals(7.0f, testSubject.sittingVolume);
+	}
 }