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program testnullable;
{$mode objfpc}
{$h+}
uses sysutils, nullable;
Const
Val1 = 'Value 1';
Val2 = 'Value 2';
Function Testinit : String;
Var
A : specialize TNullable<String>;
begin
Result:='';
If a.HasValue then
Exit('May not have a value at start');
If Not a.IsNull then
Exit('May not have a value at start (null)');
end;
Function TestSetValue : String;
Var
A : specialize TNullable<String>;
begin
Result:='';
a.Value:=Val1;
If Not a.HasValue then
Exit('Setting value does not result in hasvalue');
If a.Value<>Val1 then
Exit('Setting value does not result in correct value stored');
end;
Function TestIsnull : String;
Var
A : specialize TNullable<String>;
begin
Result:='';
If Not a.IsNull then
Exit('Not null on init');
a.Value:=Val1;
If a.IsNull then
Exit('Setting value does not result in Not isNull');
end;
Function TestClear : String;
Var
A : specialize TNullable<String>;
begin
Result:='';
a.Value:=Val1;
If Not a.HasValue then
Exit('Setting value does not result in hasvalue');
A.Clear;
If a.HasValue then
Exit('Clear does not result in no value');
end;
Function TestGetEmptyValue : String;
Var
A : specialize TNullable<String>;
B : String;
begin
Result:='';
try
B:=a.Value;
Exit('Getting empty value does not result in exception : '+B);
except
on E : Exception do
if not (E is EConvertError) then
Exit('Getting empty value does not result in correct exception class');
end;
end;
Function TestGetEmptyValueOrDefault : String;
Var
A : specialize TNullable<String>;
B : String;
begin
Result:='';
try
B:=a.ValueOrDefault;
if B<>'' then
Exit('Getting empty value does not get empty value');
a.Value:=Val2;
B:=a.ValueOrDefault;
if B<>Val2 then
Exit('Getting set value does not get empty value');
except
on E : Exception do
Exit('Getting empty value or default results in exception !');
end;
end;
Function TestSetHasValue : String;
Var
A : specialize TNullable<String>;
begin
Result:='';
a.HasValue:=true;
if Not A.HasValue then
Exit('Setting hasvalue to true does not result in correct hasvalue value');
if Not (A.Value='') then
Exit('Setting hasvalue does not result in correct empty value');
A.HasValue:=False;
if A.HasValue then
Exit('Setting hasvalue to false does not result in correct hasvalue value');
end;
Function TestTypecast1 : string;
Var
A : specialize TNullable<String>;
B : String;
begin
Result:='';
a.Value:=Val1;
B:=String(A);
If not (B=Val1) then
Exit('Typecast not correct');
A.clear;
try
B:=String(A);
Exit('No exception raised');
Except
on E : Exception do
if not (E is EConvertError) then
Exit('Getting empty value does not result in correct exception class');
end;
end;
Function TestTypecast2 : string;
Var
A : specialize TNullable<String>;
B : String;
begin
Result:='';
B:=Val1;
A:=specialize TNullable<String>(B);
If Not (A.HasValue and (A.Value=Val1)) then
Exit('Typecast not correct');
end;
Function TestAssign : string;
Var
A : specialize TNullable<String>;
B : String;
begin
Result:='';
B:=Val1;
A:=B;
If Not (A.HasValue and (A.Value=Val1)) then
Exit('Assign not correct');
end;
Function TestAssign2 : string;
Var
A : specialize TNullable<String>;
B : String;
begin
Result:='';
A.Value:=Val1;
B:=A;
If Not (B=Val1) then
Exit('Assign not correct');
A.Clear;
try
B:=A;
Exit('No exception raised');
Except
on E : Exception do
if not (E is EConvertError) then
Exit('Getting empty value does not result in correct exception class');
end;
end;
Procedure DoTest(aTest,aResult : String);
begin
if aResult<>'' then
begin
writeln(aTest,' failed : ',aResult);
Halt(1);
end
else
Writeln(aTest,' OK.');
end;
begin
DoTest('TestInit',TestInit);
DoTest('TestSetValue',TestSetValue);
DoTest('TestClear',TestClear);
DoTest('TestSetHasValue',TestSetHasValue);
DoTest('TestIsNull',TestIsNull);
DoTest('TestTypeCast1',TestTypecast1);
DoTest('TestTypeCast2',TestTypecast2);
DoTest('TestAssign',TestAssign);
DoTest('TestAssign2',TestAssign2);
DoTest('TestGetEmptyValue',TestGetEmptyValue);
DoTest('TestGetEmptyValueOrDefault',TestGetEmptyValueOrDefault);
end.
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