DX-2281 Add answer call for voice's ring BXML (#40)

* Add answer call for voice's ring BXML

* Remove assert warnings

Bandwidth.Standard/Voice/Bxml/Ring.cs

@@ -14,12 +14,19 @@ public class Ring : IVerb
         [XmlAttribute("duration")]
         public double Duration { get; set; }
 
+        /// <summary>
+        ///  (optional) A boolean indicating whether or not to answer the call when Ring is executed on an unanswered incoming call. Default value is 'true'.
+        /// </summary>
+        [XmlAttribute("answerCall")]
+        public bool AnswerCall { get; set; }
+
         /// <summary>
         /// Initialize the double fields to Bandwidth's default value
         /// </summary>
         public Ring()
         {
             Duration = 5;
+            AnswerCall = true;
         }
     }
 }

Bandwidth.StandardTests/Voice/Bxml/RingTests.cs

@@ -0,0 +1,66 @@
+using Bandwidth.Standard.Voice.Bxml;
+using Xunit;
+
+namespace Bandwidth.StandardTests.Voice.Bxml
+{
+    public class RingTests
+    {
+        [Fact]
+        public void RingShouldBeDefaults()
+        {
+            var ring = new Ring();
+
+            Assert.Equal(5, ring.Duration);
+            Assert.True(ring.AnswerCall);
+        }
+
+        [Fact]
+        public void RingDurationShouldBeTen()
+        {
+            var ring = new Ring();
+            ring.Duration = 10;
+
+            Assert.Equal(10, ring.Duration);
+        }
+
+        [Fact]
+        public void RingAnswerCallShouldBeFalse()
+        {
+            var ring = new Ring();
+            ring.AnswerCall = false;
+
+            Assert.False(ring.AnswerCall);
+        }
+
+        [Fact]
+        public void RingResponseToBXMLShouldBeDefaults()
+        {
+            var ring = new Ring();
+            var response = new Response(ring);
+
+            Assert.Equal("<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <Ring duration=\"5\" answerCall=\"true\" /></Response>", response.ToBXML());
+        }
+
+        [Fact]
+        public void RingDurationResponseToBXMLShouldBeThirty()
+        {
+            var ring = new Ring();
+            ring.Duration = 30;
+
+            var response = new Response(ring);
+
+            Assert.Equal("<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <Ring duration=\"30\" answerCall=\"true\" /></Response>", response.ToBXML());
+        }
+
+        [Fact]
+        public void RingAnswerCallResponseToBXMLShouldBeFalse()
+        {
+            var ring = new Ring();
+            ring.AnswerCall = false;
+
+            var response = new Response(ring);
+
+            Assert.Equal("<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <Ring duration=\"5\" answerCall=\"false\" /></Response>", response.ToBXML());
+        }
+    }
+}