public void TryAdd_Should_ReturnFalse_When_TryConvertReturnFalse()
{
var source = _fixture.Create <string>();
_jsonConvertible.TryConvert(source, out Arg.Any <object>())
.Returns(x =>
{
x[1] = null;
return(false);
});
_collection.TryAdd(source, out _).Should().BeFalse();
_jsonConvertible
.Received(1)
.TryConvert(source, out Arg.Any <object>());
}