correctly return hashset as array

Author: ramsessanchez

src/main/java/com/microsoft/graph/authentication/BaseAuthenticationProvider.java

@@ -33,7 +33,7 @@ public void setCustomHosts(@Nonnull String[] customHosts) {
      */
     @Nullable
     public String[] getCustomHosts(){
-        return (String[]) this.customHosts.toArray();
+        return customHosts.toArray(new String[customHosts.size()]);
     }
     /**
      * Determines whether a request should be authenticated or not based on it's url.

src/test/java/com/microsoft/graph/authentication/BaseAuthenticationProviderTest.java

@@ -1,8 +1,5 @@
 package com.microsoft.graph.authentication;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.Arrays;
@@ -11,6 +8,8 @@
 
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.*;
+
 public class BaseAuthenticationProviderTest {
     final BaseAuthenticationProvider authProvider = new BaseAuthenticationProvider() {
 
@@ -78,5 +77,7 @@ public void providerAddsTokenToCustomHosts() throws MalformedURLException {
 
         //Assert
         assertTrue(result);
+        assertEquals(authProvider.getCustomHosts().length, 1);
+        assertEquals(authProvider.getCustomHosts()[0], "localhost.com");
     }
 }