Added test for ImpersonationToken (#91).

Author: gmessner

src/test/java/org/gitlab4j/api/TestGitLabApiBeans.java

@@ -39,6 +39,7 @@
 import org.gitlab4j.api.models.Diff;
 import org.gitlab4j.api.models.Event;
 import org.gitlab4j.api.models.Group;
+import org.gitlab4j.api.models.ImpersonationToken;
 import org.gitlab4j.api.models.Issue;
 import org.gitlab4j.api.models.Job;
 import org.gitlab4j.api.models.Key;
@@ -405,6 +406,17 @@ public void testUser() {
         }
     }
 
+    @Test
+    public void testImpersonationToken() {
+
+        try {
+            ImpersonationToken token = makeFakeApiCall(ImpersonationToken.class, "impersonation-token");
+            assertTrue(compareJson(token, "impersonation-token"));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
     private <T> T makeFakeApiCall(Class<T> returnType, String file) throws JsonParseException, JsonMappingException, IOException {
 
         InputStreamReader reader = new InputStreamReader(GitLabApi.class.getResourceAsStream(file + ".json"));