Add test case

Author: jmini

gitlab4j-models/src/test/java/org/gitlab4j/models/TestGitLabApiBeans.java

@@ -53,6 +53,12 @@ public void testApplications() throws Exception {
         assertTrue(compareJson(applications, "applications.json"));
     }
 
+    @Test
+    public void testAssociations() throws Exception {
+        Associations associations = unmarshalResource(Associations.class, "associations.json");
+        assertTrue(compareJson(associations, "associations.json"));
+    }
+
     @Test
     public void testAuditEvent() throws Exception {
         List<AuditEvent> auditEvents = unmarshalResourceList(AuditEvent.class, "audit-events.json");

gitlab4j-models/src/test/resources/org/gitlab4j/models/associations.json

@@ -0,0 +1,6 @@
+{
+  "groups_count": 2,
+  "projects_count": 3,
+  "issues_count": 8,
+  "merge_requests_count": 5
+}