public void OkDoesNotEqualError()
{
var x = IntResult.Ok(1);
var y = IntResult.Err("bar");
Assert.AreNotEqual(x, y);
}
public void ErrorDoesNotEqualDifferentError()
{
var x = IntResult.Err("foo");
var y = IntResult.Err("bar");
Assert.AreNotEqual(x, y);
}
public void ErrorEqualsError()
{
var x = IntResult.Err("boom");
var y = IntResult.Err("boom");
Assert.AreEqual(x, y);
}
public void ComprehensionsWork()
{
var result =
from x in IntResult.Ok(2)
select x + 1;
Assert.AreEqual(IntResult.Ok(3), result);
var error =
from x in IntResult.Err("boom")
select x + 1;
Assert.AreEqual(IntResult.Err("boom"), error);
var error2 =
from x in IntResult.Ok(3)
from y in IntResult.Err("boom")
select x + y;
Assert.AreEqual(IntResult.Err("boom"), error2);
var result2 =
from x in IntResult.Ok(3)
from y in IntResult.Ok(4)
select x + y;
Assert.AreEqual(result2, IntResult.Ok(7));
}
public void BindRailroadsErrors()
{
var result = IntResult.Ok(21);
var actual =
result
.Bind(r => IntResult.Err("boom"))
.Bind(r => IntResult.Ok(r + 1));
Assert.AreEqual("boom", actual.Error());
}
public void MapErrMapsToANewErrorType()
{
var expected =
Result <int, SomeError> .Err(new SomeError("boom"));
var actual =
IntResult.Err("boom")
.MapErr(e => new SomeError(e));
Assert.AreEqual(expected, actual);
}
public void MapOrElseMapsErrors()
{
var expected =
Result <int, SomeError> .Err(new SomeError("boom"));
var actual =
IntResult.Err("boom")
.MapOrElse(
x => x * 2,
e => new SomeError(e)
);
Assert.AreEqual(expected, actual);
}