#747 - @History findVersionsBetween query with Oracle has incorrect ordering

src/test/java/com/avaje/ebeaninternal/server/query/OrderVersionDescTest.java

@@ -0,0 +1,81 @@
+package com.avaje.ebeaninternal.server.query;
+
+import com.avaje.ebean.Version;
+import org.junit.Test;
+
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertEquals;
+
+public class OrderVersionDescTest {
+
+  private final long now = System.currentTimeMillis();
+
+  @Test
+  public void sort() {
+
+    Version<?> atNull = atNull();
+    Version<?> at100 = at(100);
+    Version<?> at200 = at(200);
+    Version<?> at300 = at(300);
+
+    List<Version<?>> versions = new ArrayList<Version<?>>();
+    versions.add(at200);
+    versions.add(atNull);
+    versions.add(at300);
+    versions.add(at100);
+
+    Collections.sort(versions, OrderVersionDesc.INSTANCE);
+
+    assertThat(versions.get(0)).isSameAs(at300);
+    assertThat(versions.get(1)).isSameAs(at200);
+    assertThat(versions.get(2)).isSameAs(at100);
+    assertThat(versions.get(3)).isSameAs(atNull);
+  }
+
+  @Test
+  public void compare_lt() {
+
+    assertEquals(OrderVersionDesc.INSTANCE.compare(at(0), at(1)), 1);
+  }
+
+  @Test
+  public void compare_gt() {
+
+    assertEquals(OrderVersionDesc.INSTANCE.compare(at(2), at(1)), -1);
+  }
+
+  @Test
+  public void compare_eq() {
+
+    assertEquals(OrderVersionDesc.INSTANCE.compare(at(1), at(1)), 0);
+  }
+
+  @Test
+  public void compare_nullFirst() {
+
+    assertEquals(OrderVersionDesc.INSTANCE.compare(atNull(), at(1)), 1);
+  }
+
+
+  @Test
+  public void compare_nullLast() {
+
+    assertEquals(OrderVersionDesc.INSTANCE.compare(at(0), atNull()), -1);
+  }
+
+  private Version<?> atNull() {
+    return new Version();
+  }
+
+  private Version at(long diff) {
+    Timestamp timestamp = new Timestamp(now +  diff);
+    Version ver = new Version();
+    ver.setStart(timestamp);
+    return ver;
+  }
+}