Add proxy auth config tests

Author: Dan Richelson

src/test/java/com/launchdarkly/client/LDConfigTest.java

@@ -6,6 +6,7 @@
 import java.net.Proxy;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 
 public class LDConfigTest {
@@ -40,6 +41,7 @@ public void testSocketTimeoutSpecifiedInMilliseconds() {
   public void testNoProxyConfigured() {
     LDConfig config = new LDConfig.Builder().build();
     assertNull(config.proxy);
+    assertNull(config.proxyAuthenticator);
   }
 
   @Test
@@ -62,6 +64,37 @@ public void testProxy() {
     assertEquals(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("localhost2", 4444)), config.proxy);
   }
 
+  @Test
+  public void testProxyAuth() {
+    LDConfig config = new LDConfig.Builder()
+        .proxyHost("localhost2")
+        .proxyPort(4444)
+        .proxyUsername("proxyUser")
+        .proxyPassword("proxyPassword")
+        .build();
+    assertNotNull(config.proxy);
+    assertNotNull(config.proxyAuthenticator);
+  }
+
+  @Test
+  public void testProxyAuthPartialConfig() {
+    LDConfig config = new LDConfig.Builder()
+        .proxyHost("localhost2")
+        .proxyPort(4444)
+        .proxyUsername("proxyUser")
+        .build();
+    assertNotNull(config.proxy);
+    assertNull(config.proxyAuthenticator);
+
+    config = new LDConfig.Builder()
+        .proxyHost("localhost2")
+        .proxyPort(4444)
+        .proxyPassword("proxyPassword")
+        .build();
+    assertNotNull(config.proxy);
+    assertNull(config.proxyAuthenticator);
+  }
+
   @Test
   public void testMinimumPollingIntervalIsEnforcedProperly(){
     LDConfig config = new LDConfig.Builder().pollingIntervalMillis(10L).build();