ADD: failing testcase for wrong bean caching

Signed-off-by: Jonas Pöhler (JPo) <jonas.poehler@foconis.de>

src/test/java/org/tests/cache/TestBeanCacheContactLazyLoad.java

@@ -0,0 +1,68 @@
+package org.tests.cache;
+
+import io.ebean.BaseTestCase;
+import io.ebean.DB;
+import io.ebeantest.LoggedSql;
+import org.junit.Test;
+import org.tests.model.basic.Contact;
+import org.tests.model.basic.Customer;
+
+import java.sql.Date;
+import java.time.LocalDate;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Test class testing a wrong behaviour of the bean cache.
+ */
+public class TestBeanCacheContactLazyLoad extends BaseTestCase {
+
+  /**
+   * This test shows a wrong behaviour of the bean cache up to at least Ebean 12.4.*:
+   * <ul>
+   *   <li>bean partially fetched via natural key, filling the cache</li>
+   *   <li>bean modified using a setter</li>
+   *   <li>getter called on non-loaded property to trigger lazy load</li>
+   *   <li>bean fetched again using the same natural key, to hit cache</li>
+   *   <li>it is expected, that the fetched bean does not contain the modification from before</li>
+   * </ul>
+   */
+  @Test
+  public void testBeanCacheWithLazyLoading() {
+    final Customer customer = new Customer();
+    customer.setName("Customer");
+    customer.setAnniversary(Date.valueOf(LocalDate.of(2010, 1, 1)));
+    DB.save(customer);
+
+    final Contact contact = new Contact();
+    contact.setFirstName("Tim");
+    contact.setLastName("Button");
+    contact.setPhone("1234567890");
+    contact.setMobile("4567890123");
+    contact.setEmail("tim@button.com");
+    contact.setCustomer(customer);
+
+    DB.save(contact);
+
+    // Only get two properties, so we have to lazy-load later
+    final Contact contactDb = DB.find(Contact.class).where().eq("email", "tim@button.com").select("email,lastName").findOne();
+    assertThat(contactDb).isNotNull();
+    LoggedSql.start();
+    contactDb.setLastName("Buttonnnn");
+    List<String> sql = LoggedSql.collect();
+    assertThat(sql).isEmpty(); // setter did not trigger lazy load
+
+    // trigger lazy load
+    assertThat(contactDb.getPhone()).isEqualTo("1234567890");
+    sql = LoggedSql.collect();
+    assertThat(sql).isNotEmpty(); // Lazy-load took place
+
+    final Contact contactDb2 = DB.find(Contact.class).where().eq("email", "tim@button.com").select("email,lastName").findOne();
+    sql = LoggedSql.stop();
+    assertThat(sql).isEmpty(); // We expect that the bean was loaded from cache
+    assertThat(contactDb2).isNotNull();
+    assertThat(contactDb2.getLastName()).isEqualTo("Button");
+  }
+
+}