added test cases for EmptyBodyVoidRequest

src/test/java/com/auth0/net/EmptyBodyVoidRequestTest.java

@@ -0,0 +1,53 @@
+package com.auth0.net;
+
+import com.auth0.client.MockServer;
+import com.auth0.client.mgmt.TokenProvider;
+import com.auth0.net.client.Auth0HttpClient;
+import com.auth0.net.client.DefaultHttpClient;
+import com.auth0.net.client.HttpMethod;
+import com.fasterxml.jackson.core.type.TypeReference;
+import okhttp3.mockwebserver.RecordedRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.CompletableFuture;
+
+import static com.auth0.client.MockServer.AUTH_TOKENS;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+public class EmptyBodyVoidRequestTest {
+
+    private Auth0HttpClient client;
+    private TokenProvider tokenProvider;
+    private MockServer server;
+
+    @BeforeEach
+    public void setUp() throws Exception {
+        client = new DefaultHttpClient.Builder().build();
+        server = new MockServer();
+        tokenProvider = new TokenProvider() {
+            @Override
+            public String getToken() {
+                return "Bearer abc";
+            }
+
+            @Override
+            public CompletableFuture<String> getTokenAsync() {
+                return CompletableFuture.completedFuture("Bearer abc");
+            }
+        };
+    }
+
+    @Test
+    public void shouldCreatePOSTRequest() throws Exception {
+        EmptyBodyVoidRequest<Void> request = new EmptyBodyVoidRequest<>(client, tokenProvider, server.getBaseUrl(), HttpMethod.POST, new TypeReference<Void>() {});
+        assertThat(request, is(notNullValue()));
+
+        server.jsonResponse(AUTH_TOKENS, 200);
+        Void execute = request.execute().getBody();
+        RecordedRequest recordedRequest = server.takeRequest();
+        assertThat(recordedRequest.getMethod(), is(HttpMethod.POST.toString()));
+        assertThat(execute, is(nullValue()));
+    }
+}