public async Task <bool> Testfor_GetAllBook()
{
//Arrange
var res = false;
//Action
service.Setup(repos => repos.AllBook());
var result = await _SchoolServices.AllBook();
//Assertion
if (result != null)
{
res = true;
}
//Assert
//final result displaying in text file
await File.AppendAllTextAsync("../../../../output_revised.txt", "Testfor_GetAllBook=" + res + "\n");
return(res);
}