I have a question concerning SOAP::Lite initialization.

I have a self-written module where the constructor accepts two parameters for the username & password and then sets a couple of variables at module scope:

my ($_username, $_password);

sub new {
    my ($username, $password) = @_;
    $_username = $username;
    $_password = $password;
    my $self = {};
    # ...
    bless $self;
}
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These two module variables are then used in the overloading of SOAP::Transport::HTTP::Client which is used in authentication:

sub SOAP::Transport::HTTP::Client::get_basic_credentials {
    return $_username => $_password;
}
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The reason for pushing this into the module is because it being used in a Test::More script & the SOAP's complexities are to be hidden in the module.

Typically, a new module instance is used for running a battery of tests. Execution is made of a number of tests which all authenticate fine using one module instance in one subroutine is followed by creating a new module instance using bad credentials before executing another series of tests which should all intentionally fail in yet a different subroutine.

At least, this is what I intended. I assumed that placing different module instances each in their own subroutines would take care of any lingering scoping issues. I thought I could reset authentication upon the creation of each new module instance.

What I am seeing in practice is if an instance of the module is created using a correct username/password pair, all tests associated with that instance succeed as expected. What is unexpected is if I then create a new instance of the module with a bad username/password pair, all associated tests still pass because authentication was successful.

If I then go back to the initial set of tests (originally intended to pass...), & set the username/password incorrectly, those tests all fail as expected. Creation of another module instance with bad credentials causes all subsequent tests to fail as is expected.

Am I correct to assume that the username/password is getting cached? If so, is there a way I can reinitialize SOAP::Lite such that I can use my module as intended toggling authentication as intended? Any suggestions would be greatly appreciated.

Thanks!