Add VersionHelper unit tests

Author: moreaut

operator/src/test/java/oracle/kubernetes/operator/helpers/VersionHelperTest.java

@@ -0,0 +1,42 @@
+// Copyright 2018, Oracle Corporation and/or its affiliates.  All rights reserved.
+// Licensed under the Universal Permissive License v 1.0 as shown at http://oss.oracle.com/licenses/upl.
+
+package oracle.kubernetes.operator.helpers;
+
+import io.kubernetes.client.models.V1ObjectMeta;
+import static oracle.kubernetes.operator.LabelConstants.*;
+import static oracle.kubernetes.operator.create.KubernetesArtifactUtils.*;
+import static oracle.kubernetes.operator.helpers.VersionHelper.*;
+import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.Matchers.*;
+import org.junit.Test;
+
+public class VersionHelperTest {
+
+  private static final String V1 = "v1";
+
+  @Test
+  public void null_metadata_returns_false() throws Exception {
+    assertThat(matchesResourceVersion(null, V1), equalTo(false));
+  }
+
+  @Test
+  public void null_labels_returns_false() throws Exception {
+    assertThat(matchesResourceVersion(newObjectMeta().labels(null), V1), equalTo(false));
+  }
+
+  @Test
+  public void null_version_returns_false() throws Exception {
+    assertThat(matchesResourceVersion(newObjectMeta().putLabelsItem(RESOURCE_VERSION_LABEL, null), V1), equalTo(false));
+  }
+
+  @Test
+  public void different_version_returns_false() throws Exception {
+    assertThat(matchesResourceVersion(newObjectMeta().putLabelsItem(RESOURCE_VERSION_LABEL, "v2"), V1), equalTo(false));
+  }
+
+  @Test
+  public void same_version_returns_true() throws Exception {
+    assertThat(matchesResourceVersion(newObjectMeta().putLabelsItem(RESOURCE_VERSION_LABEL, V1), V1), equalTo(true));
+  }
+}