public void CreateFunction_functionName_ShouldReturnIRfcFunction()
{
var functionName = "TEST";
var connection = new RfcConnection(_interopMock.Object, RfcConfigurationOption);
RfcErrorInfo errorInfo;
_interopMock
.Setup(x => x.GetFunctionDesc(It.IsAny <IntPtr>(), It.IsAny <string>(), out errorInfo))
.Returns(FunctionDescriptionHandle);
_interopMock
.Setup(x => x.CreateFunction(It.IsAny <IntPtr>(), out errorInfo))
.Returns(FunctionHandle);
IRfcFunction function = connection.CreateFunction(functionName);
function.Should().NotBeNull();
}