public void SubsystemTest3()
{
var expr = from a in Subsystem.Return <string>("Hello")
let c = fun(() => { throw new System.Exception(); })()
from b in Subsystem.Fail <string>("Error happend")
select a + c;
var r = expr.Execute();
r.Value.ShouldBe("");
Assert.AreEqual(r.Value, "");
Assert.AreEqual(r.IsFailed, true);
}
public void SubsystemTest2()
{
B();
System.Diagnostics.StackTrace t = new System.Diagnostics.StackTrace();
var expr = from a in Subsystem.Return <string>("Hello")
let c = "Dummy"
from b in Subsystem.Fail <string>("Error happend")
select a + c;
var r = expr.Execute();
Assert.AreEqual(r.IsFailed, true);
r.Error.IfSome(err => Assert.AreEqual(err.Message, "Error happend"));
}
public Subsystem <string> FetchCommand(string[] args)
{
if (args.Count() == 0)
{
string message = "Usage: FilesUpgrad.exe <command>\n";
message += "\n";
message += "where <command> is :";
message += "upgrade, copysetting";
return(Subsystem.Fail <string>(message));
}
else
{
return(Subsystem.Return <string>(args[0]));
}
}
public Subsystem <string> ErrorHappened() =>
from a in Subsystem.Fail <string>("error")
select a;