added NegativeSalesException, updated ShopTest

.project

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>EconomicSimulationProject-Java-</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>

Iteration_3/bin/.gitignore

@@ -0,0 +1,4 @@
+/customerPackage/
+/inventoryPackage/
+/resources/
+/simulationPackage/

Iteration_3/src/inventoryPackage/NegativeSalesException.java

@@ -0,0 +1,17 @@
+package inventoryPackage;
+
+/**
+ * 
+ * @author patrickmcdermott
+ * 
+ * Thrown to indicate that the increment was negative.
+ *
+ */
+public class NegativeSalesException extends IllegalArgumentException {
+
+
+	private static final long serialVersionUID = 1L;
+
+
+
+}

Iteration_3/src/inventoryPackage/Shop.java

@@ -36,9 +36,14 @@ public class Shop {
 	//Sets selection of items to empty
 	public void clearSelection() {selectedItems = new ArrayList<>();}
 
-	//Increments sales by given amount
+	/**
+	 * Increments this shop object's sales 
+	 * by the value of the argument passed. 
+	 * Throws new NegativeSalesException if the argument passed is less than 0.
+	 * @param increment value as a double
+	 */
 	public void incrementSales(double increment) {
-		if (increment < 0) throw new IllegalArgumentException();
+		if (increment < 0) throw new NegativeSalesException();
 		else this.sales += increment;
 		}
 

Iteration_3/src/inventoryPackage/ShopTest.java

@@ -35,7 +35,7 @@ public void createShop() {
 	}
 
 
-	@Test (expected = Exception.class)
+	@Test (expected = NegativeSalesException.class)
 	public void testIncrementSales() {
 		shop.incrementSales(-10.00);
 	}