Add payment method tests

src/test/java/ch/wisv/events/core/model/order/PaymentMethodTest.java

@@ -0,0 +1,71 @@
+package ch.wisv.events.core.model.order;
+
+import ch.wisv.events.core.model.customer.Customer;
+import ch.wisv.events.core.model.product.Product;
+import ch.wisv.events.core.util.VatRate;
+import com.google.common.collect.ImmutableList;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+
+@RunWith(MockitoJUnitRunner.class)
+public class PaymentMethodTest {
+
+    @Test
+    public void testCalculateCostIncludingTransaction_Cash() {
+        double cost = 50.0;
+        PaymentMethod paymentMethod = PaymentMethod.CASH;
+
+        double expected = 50.0;
+        double actual = paymentMethod.calculateCostIncludingTransaction(cost);
+
+        assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void testCalculateCostIncludingTransaction_Card() {
+        double cost = 50.0;
+        PaymentMethod paymentMethod = PaymentMethod.CARD;
+
+        double expected = 50.0;
+        double actual = paymentMethod.calculateCostIncludingTransaction(cost);
+
+        assertEquals(expected, actual, 0.001);
+    }
+    @Test
+    public void testCalculateCostIncludingTransaction_IDEAL() {
+        double cost = 50.0;
+        PaymentMethod paymentMethod = PaymentMethod.IDEAL;
+
+        double expected = 50.35;
+        double actual = paymentMethod.calculateCostIncludingTransaction(cost);
+
+        assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void testCalculateCostIncludingTransaction_SOFORT() {
+        double cost = 50.0;
+        PaymentMethod paymentMethod = PaymentMethod.SOFORT;
+
+        double expected = 50.85; // Rounded 50.847
+        double actual = paymentMethod.calculateCostIncludingTransaction(cost);
+
+        assertEquals(expected, actual, 0.001);
+    }
+
+    @Test
+    public void testCalculateCostIncludingTransaction_OTHER() {
+        double cost = 50.0;
+        PaymentMethod paymentMethod = PaymentMethod.OTHER;
+
+        double expected = 50.0; // Since OTHER method has no transaction cost, the expected value should be same as the cost
+        double actual = paymentMethod.calculateCostIncludingTransaction(cost);
+
+        assertEquals(expected, actual, 0.001);
+    }
+}