public void HeaderDictionary_GetHeaders_Success()
        {
            // Arrange
            var context = new OwinContext();

            context.Request.Headers.Add(new KeyValuePair <string, string[]>("Authorization", new [] { "Basic 12345:6789" }));

            var parser = new RequestParser();

            // Act
            var result = parser.HeaderDictionary(context.Environment);

            // Assert
            result.Count.Should().Be(1);
            result["Authorization"].Should().Be("Basic 12345:6789");
        }