Testcase for ebean with circular dependences

1. While the javax.persistance api discourages the use of bidirectional
   cascades, it does not prohibit them. They're very useful and natural
   if you think of the database as a graph instead of a tree.
   test case 1 (testCircularCascade) tests this.
2. Second test case fetches the child, but saves the parent. If used like
   that, the child will not have it's changes saved.

src/test/java/org/tests/update/objects/Child.java

@@ -0,0 +1,52 @@
+package org.tests.update.objects;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.OneToOne;
+import javax.persistence.Table;
+import javax.persistence.Version;
+
+@Entity
+@Table(name = "e_save_test_d")
+public class Child {
+  @Id
+  private Long id;
+  @Version
+  private long version = 0L;
+  @OneToOne(mappedBy = "child")
+  private Parent parent;
+
+  private boolean testProperty = false;
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public long getVersion() {
+    return version;
+  }
+
+  public void setVersion(long version) {
+    this.version = version;
+  }
+
+  public Parent getParent() {
+    return parent;
+  }
+
+  public void setParent(Parent parent) {
+    this.parent = parent;
+  }
+
+  public boolean isTestProperty() {
+    return testProperty;
+  }
+
+  public void setTestProperty(boolean testProperty) {
+    this.testProperty = testProperty;
+  }
+}