[OLINGO-603] Action import with no return type test

fit/src/test/java/org/apache/olingo/fit/tecsvc/client/ActionImportITCase.java

@@ -48,6 +48,15 @@ import org.junit.Test;
 
 public class ActionImportITCase extends AbstractBaseTestITCase {
 
+  @Test
+  public void noReturnTypeAction() throws Exception {
+      URI actionURI =
+          getClient().newURIBuilder(TecSvcConst.BASE_URI).appendActionCallSegment("AIRT").build();
+      ODataInvokeResponse<ClientProperty> response =
+          getClient().getInvokeRequestFactory().getActionInvokeRequest(actionURI, ClientProperty.class).execute();
+      assertEquals(204, response.getStatusCode());
+  }
+  
   @Test
   public void primitveAction() throws Exception {
     URI actionURI =

fit/src/test/java/org/apache/olingo/fit/tecsvc/client/BindingITCase.java

@@ -236,7 +236,6 @@ public class BindingITCase extends AbstractBaseTestITCase {
   }
 
   @Test
-  @SuppressWarnings("unused")
   public void testMissingEntity() {
     // Update an existing entity, use a URI to a not existing entity
     // Perform the request to a single navigation property and a collection navigation property as well.

fit/src/test/java/org/apache/olingo/fit/tecsvc/client/FilterSystemQueryITCase.java

@@ -472,7 +472,6 @@ public class FilterSystemQueryITCase extends AbstractBaseTestITCase {
   }
 
   @Test
-  @SuppressWarnings("unused")
   public void testSubstringDouble() {
     try {
       sendRequest(ES_ALL_PRIM, "substring(PropertyString, length('First')"

fit/src/test/java/org/apache/olingo/fit/tecsvc/client/SystemQueryOptionITCase.java

@@ -264,7 +264,6 @@ public class SystemQueryOptionITCase extends AbstractBaseTestITCase {
   }
 
   @Test
-  @SuppressWarnings("unused")
   public void testNegativeSkip() {
     ODataClient client = getClient();
     URI uri = client.newURIBuilder(SERVICE_URI)
@@ -283,7 +282,6 @@ public class SystemQueryOptionITCase extends AbstractBaseTestITCase {
   }
 
   @Test
-  @SuppressWarnings("unused")
   public void testNegativeTop() {
     ODataClient client = getClient();
     URI uri = client.newURIBuilder(SERVICE_URI)

lib/commons-api/src/main/java/org/apache/olingo/commons/api/edm/provider/CsdlEdmProvider.java

@@ -154,7 +154,7 @@ public interface CsdlEdmProvider {
   /**
    * This method should return a collection of all {@link CsdlSchema}
    *
-   * @return List<{@link Schema}>
+   * @return List<{@link CsdlSchema}>
    * @throws ODataException
    */
   public List<CsdlSchema> getSchemas() throws ODataException;