public void when_try_to_take_stored_thing_by_name_and_its_parent_type_it_should_return_it_and_success_status()
{
var sut = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
var thingItself = new Derived();
sut.Put(nameOfThing, thingItself);
sut.TryTake <Base>(nameOfThing, out var foundThing).Should().BeTrue("the requested thing lies in the pocket");
foundThing.Should().BeSameAs(thingItself, "thing should be stored by reference");
}
public void when_try_to_take_missing_struct_thing_it_should_return_default_value_and_fail_status()
{
var sut = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
var thingItself = DateTime.Now;
sut.Put(nameOfThing, thingItself);
sut.TryTake <DateTime>("a different name", out var foundThing).Should().BeFalse("there is no a thing with this name in the pocket");
foundThing.Should().Be(new DateTime(), "default DateTime is expected 'nothing' for a struct DateTime");
}
public void when_try_to_take_missing_reference_thing_it_should_return_null_and_fail_status()
{
var sut = new ConcurrentPocket();
const string nameOfThing = "name of the thing";
const string thingItself = "the thing itself";
sut.Put(nameOfThing, thingItself);
sut.TryTake <string>("a different name", out var foundThing).Should().BeFalse("there is no a thing with this name in the pocket");
foundThing.Should().BeNull("null is expected 'nothing' for a reference type");
}
public void when_try_to_take_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.TryTake <DateTime>(nameOfThing, out _);
sut.Should().Throw <InvalidCastException>("impossible to cast a string to the different type");
}
public void when_try_to_take_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.TryTake <string>(name: null, out var _);
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "name",
"null is not a valid name");
sut = () => pocket.TryTake <string>(string.Empty, out var _);
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "name",
"an empty string is not a valid name");
sut = () => pocket.TryTake <string>(WhiteSpaceString, out var _);
sut.Should().Throw <ArgumentNullException>().Where(
exception => exception.ParamName == "name",
"a whitespace is not a valid name");
}