Refactor and add test flows

Small fix in version state filter

Change-Id: I015cbc52b8620b92ebb4f8f0167711e39d9d30a8
Issue-ID: SDC-1503
Signed-off-by: talig <talig@amdocs.com>

2 files changed, 4 insertions, 3 deletions

diff --git a/workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/types/VersionStatesFormatter.java b/workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/types/VersionStatesFormatter.java
index 5467dee8..c9d3bf1e 100644
--- a/workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/types/VersionStatesFormatter.java
+++ b/workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/types/VersionStatesFormatter.java
@@ -1,6 +1,7 @@
 package org.onap.sdc.workflow.api.types;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Set;
 import java.util.stream.Collectors;
 import lombok.Getter;
@@ -29,8 +30,8 @@ public class VersionStatesFormatter {
                                                 .collect(Collectors.toSet());
         } catch (Exception ignore) {
             LOGGER.info(
-                    "value is invalid and cannot be formatted to a set of version states, therefore it set to null");
-            return null;
+                    "value is invalid and cannot be formatted to a set of version states, therefore it set to empty set");
+            return Collections.emptySet();
         }
     }
 }
diff --git a/workflow-designer-be/src/test/java/org/onap/sdc/workflow/api/types/VersionStatesFormatterTest.java b/workflow-designer-be/src/test/java/org/onap/sdc/workflow/api/types/VersionStatesFormatterTest.java
index c57bd9c3..423c5e6c 100644
--- a/workflow-designer-be/src/test/java/org/onap/sdc/workflow/api/types/VersionStatesFormatterTest.java
+++ b/workflow-designer-be/src/test/java/org/onap/sdc/workflow/api/types/VersionStatesFormatterTest.java
@@ -22,7 +22,7 @@ public class VersionStatesFormatterTest {
     @Test
     public void setVersionStateInvalid() {
         versionStateSet.setVersionState("aaa");
-        assertNull(versionStateSet.getVersionStates());
+        assertEquals(Collections.emptySet() ,versionStateSet.getVersionStates());
     }
 
     @Test