Failing unit test to demonstrate the bug that deleting an entity via … (#1445)

* Failing unit test to demonstrate the bug that deleting an entity via an Ebean query does not respect the cascade setting.
(here a mapped optional OneToOne entity is not deleted using an Ebean query even if the CascadeType.ALL was used)

* moved init and cleanup code to @Before and @After JUnit methods and added another test that shows Ebean.delete() works as expected

src/test/java/org/tests/basic/delete/TestDeleteCascadeByQuery.java

@@ -0,0 +1,76 @@
+package org.tests.basic.delete;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.ebean.BaseTestCase;
+import io.ebean.Ebean;
+import io.ebean.Query;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.tests.model.onetoone.OtoUser;
+import org.tests.model.onetoone.OtoUserOptional;
+
+public class TestDeleteCascadeByQuery extends BaseTestCase {
+  
+  private OtoUser testUser;
+  private OtoUserOptional userOptional;
+  private Query<OtoUserOptional> userOptionalQuery = Ebean.find(OtoUserOptional.class);
+  private Query<OtoUser> userQuery = Ebean.find(OtoUser.class);
+  
+  /**
+   * Init each test. Delete all existing beans. Then create OtoUser, add OtoUserOptional and save.
+   */
+  @Before
+  public void init() {
+    Ebean.deleteAll(userQuery.findList());
+    Ebean.deleteAll(userOptionalQuery.findList());
+    
+    userOptional = new OtoUserOptional();
+    Ebean.save(userOptional);
+    testUser = new OtoUser();
+    testUser.setOptional(userOptional);
+    Ebean.save(testUser);
+  }
+  
+  /**
+   * Test that validates deleting a bean using Ebean.delete() respects the CascadeType.DELETE 
+   * setting.
+   */
+  @Test
+  public void testDeleteCascadeByEbeanDelete() {
+
+    assertThat(Ebean.delete(testUser)).isTrue();
+
+    assertThat(userOptionalQuery.findCount())
+      .overridingErrorMessage("Entity OtoUserOptional found. Ebean.delete() on the user "
+          + "did not delete the OneToOne mapped entity as set with CascadeType.ALL")
+      .isEqualTo(0);
+  }
+  
+  /**
+   * Test that validates deleting a bean with OneToOne mapping with a query respects the 
+   * CascadeType.DELETE setting.
+   */
+  @Test
+  public void testDeleteCascadeByQuery() {
+    
+    assertThat(userQuery.delete()).isEqualTo(1);
+
+    assertThat(userOptionalQuery.findCount())
+      .overridingErrorMessage("Entity OtoUserOptional found. Ebean query delete() on the user "
+          + "did not delete the OneToOne mapped entity as set with CascadeType.ALL")
+      .isEqualTo(0);
+  }
+  
+  /**
+   * Cleanup - Delete all existing beans for the next test.
+   */
+  @After
+  public void cleanup() {
+    Ebean.deleteAll(userQuery.findList());
+    Ebean.deleteAll(userOptionalQuery.findList());
+  }
+}