Test for product value object equality and fix contract test

Author: paulrayner

src/warranty/ContractTest.java

@@ -16,7 +16,6 @@ public void TestContractIsSetupCorrectly()
         Contract contract = new Contract(100.0, product, new Date(2010, 5, 7), new Date(2010, 5, 8), new Date(2013, 5, 8));
 
         assertNotNull(contract.id);
-        System.out.println(contract.id);
         assertEquals(100.0, contract.purchasePrice);
         assertEquals(Contract.Status.PENDING, contract.status);
         assertEquals(contract.purchaseDate, new Date(2010, 5, 7));

src/warranty/ProductTest.java

@@ -0,0 +1,32 @@
+package warranty;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Date;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ProductTest {
+
+    // Product is an example of a value object. See https://martinfowler.com/bliki/ValueObject.html for more details
+    @Test
+    public void TestProductEquality() {
+        // A value object must be created whole
+        Product product = new Product("dishwasher", "OEUOEU23", "Whirlpool", "7DP840CWDB0");
+
+        // Demonstrate equality by property - uses custom "equals" method in this example
+        assertEquals(new Product("dishwasher", "OEUOEU23", "Whirlpool", "7DP840CWDB0"), product);
+    }
+    // Product is an example of a value object. See https://martinfowler.com/bliki/ValueObject.html for more details
+    @Test
+    public void TestProductInequality() {
+        Product product = new Product("dishwasher", "OEUOEU23", "Whirlpool", "7DP840CWDB0");
+
+        // Demonstrate equality by property - uses custom "equals" method in this example
+        assertNotEquals(new Product("stove", "OEUOEU23", "Whirlpool", "7DP840CWDB0"), product);
+        assertNotEquals(new Product("dishwasher", "BEUOEU23", "Whirlpool", "7DP840CWDB0"), product);
+        assertNotEquals(new Product("dishwasher", "OEUOEU23", "Maytag", "7DP840CWDB0"), product);
+        assertNotEquals(new Product("dishwasher", "OEUOEU23", "Whirlpool", "9999999"), product);
+    }
+}