public void when_take_or_put_stored_thing_with_unexpected_type_it_should_throw()
{
var pocket = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
const string thingItself = "the thing itself";
pocket.Put(nameOfThing, thingItself);
Action sut = () => pocket.TakeOrPut(nameOfThing, () => new given_pocket_extensions());
sut.Should().Throw <InvalidCastException>("impossible to cast a string to the different type");
}
public void when_take_or_put_thing_with_invalid_factory_it_should_throw()
{
var pocket = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
const string thingItself = "the thing itself";
pocket.Put(nameOfThing, thingItself);
Action sut = () => pocket.TakeOrPut <string>(nameOfThing, thingFactory: null);
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "thingFactory",
"null is not a valid thing factory");
}
public void when_take_or_put_thing_with_invalid_name_given_it_should_throw()
{
var pocket = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
const string thingItself = "the thing itself";
pocket.Put(nameOfThing, thingItself);
Action sut = () => pocket.TakeOrPut(name: null, () => "not relevant");
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "name",
"null is not a valid name");
sut = () => pocket.TakeOrPut(string.Empty, () => "not relevant");
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "name",
"an empty string is not a valid name");
sut = () => pocket.TakeOrPut(WhiteSpaceString, () => "not relevant");
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "name",
"a whitespace is not a valid name");
}
public void when_take_or_put_stored_thing_it_should_be_found()
{
var sut = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
const string thingItself = "the thing itself";
var isFactoryCalled = false;
Func <string> thingFactory = () =>
{
isFactoryCalled = true;
return(thingItself);
};
sut.Put(nameOfThing, thingItself);
sut.TakeOrPut(nameOfThing, thingFactory).Should().BeSameAs(thingItself, "the thing lies in the pocket");
isFactoryCalled.Should().BeFalse("the think was already stored in the pocket");
}
public void when_take_or_put_thing_from_empty_pocket_it_should_make_thing_put_it_into_pocket_and_return_it()
{
var sut = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
const string thingItself = "the thing itself";
var isFactoryCalled = false;
Func <string> thingFactory = () =>
{
isFactoryCalled = true;
return(thingItself);
};
var thing = sut.TakeOrPut(nameOfThing, thingFactory);
sut.GetThings().Count.Should().Be(expected: 1, "the made thing should be stored in the pocket");
isFactoryCalled.Should().BeTrue("it was an empty pocket and the thing should be made from scratch");
thing.Should().BeSameAs(thingItself, "exactly this thing was made");
}