Add basic test for the proxy functionality

Author: dvacca-onfido

src/test/java/com/onfido/OnfidoTest.java

@@ -5,6 +5,8 @@
 
 import com.onfido.ApiClient.Region;
 import com.onfido.api.DefaultApi;
+import java.net.InetSocketAddress;
+import java.net.Proxy;
 import java.util.UUID;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
@@ -73,4 +75,12 @@ public void usesCARegionApiUrl() {
 
     Assertions.assertEquals("https://api.ca.onfido.com/v3.6", url);
   }
+
+  @Test()
+  public void usesProxy() {
+    Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("localhost", 3128));
+    DefaultApi onfido = new DefaultApi(apiClient.setApiToken("token").setProxy(proxy));
+
+    Assertions.assertEquals(proxy, onfido.getApiClient().getProxy());
+  }
 }

src/test/java/com/onfido/integration/PingTest.java

@@ -0,0 +1,14 @@
+package com.onfido.integration;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class PingTest extends TestBase {
+
+  @Test
+  public void pingTest() throws Exception {
+    String response = onfido.ping();
+
+    Assertions.assertEquals("OK", response);
+  }
+}