#919 - io.ebean package initial

src/test/java/org/tests/basic/TestPersistenceContext.java

@@ -0,0 +1,81 @@
+package org.tests.basic;
+
+import io.ebean.BaseTestCase;
+import io.ebean.Ebean;
+import org.tests.model.basic.Customer;
+import org.tests.model.basic.Order;
+import org.tests.model.basic.ResetBasicData;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestPersistenceContext extends BaseTestCase {
+
+  @Test
+  public void test() {
+
+    ResetBasicData.reset();
+
+    // implicit transaction with its own
+    // persistence context
+    Order oBefore = Ebean.find(Order.class, 1);
+
+    Order order = null;
+
+    // start a persistence context
+    Ebean.beginTransaction();
+    try {
+
+      order = Ebean.find(Order.class, 1);
+
+      // not the same instance ...as a different
+      // persistence context
+      Assert.assertTrue(order != oBefore);
+
+
+      // finds an existing bean in the persistence context
+      // ... so doesn't even execute a query
+      Order o2 = Ebean.find(Order.class, 1);
+      Order o3 = Ebean.getReference(Order.class, 1);
+
+      // all the same instance
+      Assert.assertTrue(order == o2);
+      Assert.assertTrue(order == o3);
+
+    } finally {
+      Ebean.endTransaction();
+    }
+
+    // implicit transaction with its own
+    // persistence context
+    Order oAfter = Ebean.find(Order.class, 1);
+
+    Assert.assertTrue(oAfter != oBefore);
+    Assert.assertTrue(oAfter != order);
+
+
+    Order testOrder = ResetBasicData.createOrderCustAndOrder("testPC");
+    Integer id = testOrder.getCustomer().getId();
+    Integer orderId = testOrder.getId();
+
+    // start a persistence context
+    Ebean.beginTransaction();
+    try {
+      Customer customer = Ebean.find(Customer.class)
+        .setUseCache(false)
+        .setId(id)
+        .findUnique();
+
+      System.gc();
+      Order order2 = Ebean.find(Order.class, orderId);
+      Customer customer2 = order2.getCustomer();
+
+      Assert.assertEquals(customer.getId(), customer2.getId());
+
+      Assert.assertTrue(customer == customer2);
+
+    } finally {
+      Ebean.endTransaction();
+    }
+  }
+
+}