public void PathBase_Added(string startValue, string pathBase, bool append, string expected)
{
var httpContext = new DefaultHttpContext();
httpContext.Request.PathBase = string.IsNullOrEmpty(pathBase) ? new PathString() : new PathString(pathBase);
var transform = new RequestHeaderXForwardedPathBaseTransform(append);
var result = transform.Apply(httpContext, new HttpRequestMessage(), startValue.Split(";", System.StringSplitOptions.RemoveEmptyEntries));
Assert.Equal(expected.Split(";", System.StringSplitOptions.RemoveEmptyEntries), result);
}