diff --git a/src/test/java/millions/StockTest.java b/src/test/java/millions/StockTest.java
index eda8962..13a95a8 100644
--- a/src/test/java/millions/StockTest.java
+++ b/src/test/java/millions/StockTest.java
@@ -2,4 +2,39 @@
 
 import static org.junit.jupiter.api.Assertions.*;
 
-class StockTest {}
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Arrays;
+import org.junit.jupiter.api.Test;
+
+class StockTest {
+  @Test
+  public void testHapyPath() {
+    Stock stock = new Stock("NVDA", "Nvadia", BigDecimal.valueOf(20));
+    Stock stock2 =
+        new Stock(
+            "NVDA", "Nvadia", new ArrayList<BigDecimal>(Arrays.asList(BigDecimal.valueOf(20))));
+    stock2.addNewSalesPrice(BigDecimal.valueOf(30));
+    assertEquals(BigDecimal.valueOf(30), stock2.getSalesPrice());
+  }
+
+  @Test
+  public void settersAndGetters() {
+    Stock stock = new Stock("NVDA", "Nvadia", BigDecimal.valueOf(20));
+    assertEquals("NVDA", stock.getSymbol());
+    assertEquals("Nvadia", stock.getCompany());
+  }
+
+  @Test
+  public void testNullsAndInvalid() {
+
+    assertThrows(
+        IllegalArgumentException.class, () -> new Stock(null, "Nvadia", BigDecimal.valueOf(20)));
+    assertThrows(
+        IllegalArgumentException.class, () -> new Stock("NVDA", null, BigDecimal.valueOf(20)));
+    assertThrows(
+        IllegalArgumentException.class, () -> new Stock("NVDA", "", BigDecimal.valueOf(20)));
+    assertThrows(
+        IllegalArgumentException.class, () -> new Stock("", "Nvadia", BigDecimal.valueOf(20)));
+  }
+}