Add line break method to the message builder.

Author: jforsell

src/SymphonyOSS.RestApiClient/MessageML/MessageBuilder.cs

@@ -139,6 +139,17 @@ public MessageBuilder Link(string href)
             return this;
         }
 
+        /// <summary>
+        /// Appends a line break.
+        /// </summary>
+        /// <returns>Itself to allow for chaining.</returns>
+        public MessageBuilder NewLine()
+        {
+            var xmlElement = _xmlDocument.CreateElement("br");
+            _rootElement.AppendChild(xmlElement);
+            return this;
+        }
+
         /// <summary>
         /// Constructs the string representation of this message.
         /// </summary>

test/SymphonyOSS.RestApiClient.Tests/MessageBuilderTest.cs

@@ -67,5 +67,16 @@ public void EnsureMentions_are_inserted()
                 .ToString();
             Assert.Equal("<messageML><mention uid=\"12345\" /><mention email=\"[email protected]\" /></messageML>", emptyMessage);
         }
+
+        [Fact]
+        public void EnsureNewLine_is_inserted()
+        {
+            var emptyMessage = new MessageBuilder()
+                .Text("line 1")
+                .NewLine()
+                .Text("line 2")
+                .ToString();
+            Assert.Equal("<messageML>line 1<br />line 2</messageML>", emptyMessage);
+        }
     }
 }