Add JUnit for engine service

Although the Apex engine service is called by the policy engine
tests and the various interface tests, the test coverage on these
classes is not showing up in Sonar. In any event it is better
that specific JUint is done for them.

Issue-ID: POLICY-1034
Change-Id: I0028c7e5e870c18649870536cf3691fce2ab689c
Signed-off-by: liamfallon <liam.fallon@ericsson.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java
index 022617864..efd6aec5e 100644
--- a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java
+++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java
@@ -408,6 +408,10 @@ public class ApexEngineImpl implements ApexEngine {
     public Map<AxArtifactKey, Map<String, Object>> getEngineContext() {
         final Map<AxArtifactKey, Map<String, Object>> currentContext = new LinkedHashMap<>();
 
+        if (internalContext == null) {
+            return currentContext;
+        }
+        
         for (final Entry<AxArtifactKey, ContextAlbum> contextAlbumEntry : internalContext.getContextAlbums()
                         .entrySet()) {
             currentContext.put(contextAlbumEntry.getKey(), contextAlbumEntry.getValue());