remove MimeKitLite and use MediaTypeHeaderValue (#338)

test/WireMock.Net.Tests/Http/StringContentHelperTests.cs

@@ -0,0 +1,39 @@
+using System.Net.Http.Headers;
+using FluentAssertions;
+using WireMock.Http;
+using Xunit;
+
+namespace WireMock.Net.Tests.Http
+{
+    public class StringContentHelperTests
+    {
+        [Fact]
+        public void StringContentHelper_Create_WithNullContentType()
+        {
+            // Act
+            var result = StringContentHelper.Create("test", null);
+
+            // Assert
+            result.Headers.ContentType.Should().BeNull();
+            result.ReadAsStringAsync().Result.Should().Be("test");
+        }
+
+        [Theory]
+        [InlineData("application/json", "application/json")]
+        [InlineData("application/soap+xml", "application/soap+xml")]
+        [InlineData("application/soap+xml;charset=UTF-8", "application/soap+xml; charset=UTF-8")]
+        [InlineData("application/soap+xml;charset=UTF-8;action=\"http://myCompany.Customer.Contract/ICustomerService/GetSomeConfiguration\"", "application/soap+xml; charset=UTF-8; action=\"http://myCompany.Customer.Contract/ICustomerService/GetSomeConfiguration\"")]
+        public void StringContentHelper_Create(string test, string expected)
+        {
+            // Arrange
+            var contentType = MediaTypeHeaderValue.Parse(test);
+
+            // Act
+            var result = StringContentHelper.Create("test", contentType);
+
+            // Assert
+            result.Headers.ContentType.ToString().Should().Be(expected);
+            result.ReadAsStringAsync().Result.Should().Be("test");
+        }
+    }
+}