ensure that prices can only be increased by positive numbers

taveras · Apr 17, 2024 · 2e0345e · 2e0345e
1 parent e9da68b
commit 2e0345e
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diff --git a/src/edu/berkeley/aep/Stock.java b/src/edu/berkeley/aep/Stock.java
@@ -16,6 +16,9 @@ public int currentPrice() {
     }
 
     public void increasePrice(int amount) {
+        if (amount <= 0) {
+            throw new RuntimeException("Unable to increase stock price by " + amount);
+        }
         price += amount;
     }
 

diff --git a/test/edu/berkeley/aep/StockTest.java b/test/edu/berkeley/aep/StockTest.java
@@ -3,6 +3,7 @@
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThrows;
 
 public class StockTest {
     @Test
@@ -18,6 +19,15 @@ public void canIncreasePrice() {
         assertEquals(105, company.currentPrice());
     }
 
+    @Test
+    public void canNotIncreasePriceByNegativeNumber() {
+        Stock company = new Stock("ABC", 100);
+        assertThrows(
+                RuntimeException.class,
+                () -> company.increasePrice(-5)
+        );
+    }
+
     @Test
     public void canDecreasePrice() {
         Stock company = new Stock("ABC", 100);