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    $sshss->mock( get_abs_script_basedir => sub { return $script_basedir } );
    $sshss->mock( _exec => sub (&@) { @exec_args = @_; return; } );

    # Change to a different tempdir to see if the chdir functionality works
    my $basedir = tempdir();
    chdir $basedir;

    note('login shell, script inside .ssh dir');
    {
        local $ENV{HOME}  = '/home/dummy';
        local $ENV{SHELL} = '/bin/dummy';

        $script_basedir = File::Spec->catdir( $tmpdir, '.ssh' );
        mkdir $script_basedir;

        local @ARGV = ($shell);

        my ( $stdout, $stderr, @result ) = capture { App::SSH::SwitchShell::main() };
        is( $result[0],  undef,   'main() returns undef (because we mocked _exec)' );
        is( $stdout,     q{},     '... prints nothing to STDOUT' );
        is( $stderr,     q{},     '... prints nothing to STDERR' );
        is( $ENV{HOME},  $tmpdir, '... HOME environment variable is correctly set' );
        is( $ENV{SHELL}, $shell,  '... SHELL environment variable is correctly set' );
        is( cwd(),       $tmpdir, '... cwd is correctly changed' );
        my $exec_file = ( shift @exec_args )->();
        is( $exec_file, $shell, '... the correct shell was run' );
        is_deeply( \@exec_args, [qw(-shell.pl)], '... with the correct arguments' );

        chdir $basedir;
    }

    note(q{run 'perl -v', script inside .ssh dir});
    {
        local $ENV{HOME}                 = '/home/dummy';
        local $ENV{SHELL}                = '/bin/dummy';
        local $ENV{SSH_ORIGINAL_COMMAND} = "$EXECUTABLE_NAME -v";

        $script_basedir = File::Spec->catdir( $tmpdir, '.ssh' );

        local @ARGV = ($shell);

        my ( $stdout, $stderr, @result ) = capture { App::SSH::SwitchShell::main() };
        is( $result[0],  undef,   'main() returns undef (because we mocked _exec)' );
        is( $stdout,     q{},     '... prints nothing to STDOUT (because we mocked _exec)' );
        is( $stderr,     q{},     '... prints nothing to STDERR' );
        is( $ENV{HOME},  $tmpdir, '... HOME environment variable is correctly set' );
        is( $ENV{SHELL}, $shell,  '... SHELL environment variable is correctly set' );
        is( cwd(),       $tmpdir, '... cwd is correctly changed' );
        my $exec_file = ( shift @exec_args )->();
        is( $exec_file, $shell, '... the correct shell was run' );
        is_deeply( \@exec_args, [ 'shell.pl', '-c', "$EXECUTABLE_NAME -v" ], '... with the correct arguments' );

        chdir $basedir;
    }

    note('login shell, script in "invalid directory"');
    {
        local $ENV{HOME}  = '/home/dummy';
        local $ENV{SHELL} = '/bin/dummy';

        my $not_existing_home = File::Spec->catdir( $tmpdir, 'dir_does_not_exist' );
        $script_basedir = File::Spec->catdir( $not_existing_home, '.ssh' );

        local @ARGV = ($shell);

        my ( $stdout, $stderr, @result ) = capture { App::SSH::SwitchShell::main() };
        is( $result[0], undef, 'main() returns undef (because we mocked _exec)' );
        is( $stdout,    q{},   '... prints nothing to STDOUT' );
        like( $stderr, "/ ^ \QCould not chdir to home '$not_existing_home':\E /xsm", '... prints that chdir() failed to STDERR' );
        is( $ENV{HOME},  $not_existing_home, '... HOME environment variable is correctly set' );
        is( $ENV{SHELL}, $shell,             '... SHELL environment variable is correctly set' );
        is( cwd(),       $basedir,           '... cwd is not changed because dir does not exist' );
        my $exec_file = ( shift @exec_args )->();
        is( $exec_file, $shell, '... the correct shell was run' );
        is_deeply( \@exec_args, [qw(-shell.pl)], '... with the correct arguments' );

        chdir $basedir;
    }

    note('login shell, script in ~/.ssh');
    {
        local $ENV{HOME}  = $tmpdir;
        local $ENV{SHELL} = '/bin/dummy';

        chdir $tmpdir;
        $script_basedir = File::Spec->catdir( $tmpdir, '.ssh' );

        local @ARGV = ($shell);

        my ( $stdout, $stderr, @result ) = capture { App::SSH::SwitchShell::main() };
        is( $result[0],  undef,   'main() returns undef (because we mocked _exec)' );
        is( $stdout,     q{},     '... prints nothing to STDOUT' );
        is( $stderr,     q{},     '... prints nothing to STDERR' );
        is( $ENV{HOME},  $tmpdir, '... HOME environment variable is correctly set' );
        is( $ENV{SHELL}, $shell,  '... SHELL environment variable is correctly set' );
        is( cwd(),       $tmpdir, '... cwd is correctly changed' );
        my $exec_file = ( shift @exec_args )->();
        is( $exec_file, $shell, '... the correct shell was run' );
        is_deeply( \@exec_args, [qw(-shell.pl)], '... with the correct arguments' );

        chdir $basedir;
    }

    note('login shell, HOME and script basedir are reached through symlink');
    {
        my $homedir = File::Spec->catdir( $tmpdir, 'HOMEDIR' );
        mkdir $homedir;

        my $homelnk = File::Spec->catfile( $tmpdir, 'HOMELINK' );
        symlink 'HOMEDIR', $homelnk;

        $script_basedir = File::Spec->catdir( $homelnk, 'abc' );
        mkdir $script_basedir;
        $script_basedir = File::Spec->catdir( $script_basedir, '.ssh' );
        mkdir $script_basedir;

        local $ENV{HOME}  = $homelnk;
        local $ENV{SHELL} = '/bin/dummy';

        local @ARGV = ($shell);

        my ( $stdout, $stderr, @result ) = capture { App::SSH::SwitchShell::main() };
        is( $result[0], undef, 'main() returns undef (because we mocked _exec)' );
        is( $stdout,    q{},   '... prints nothing to STDOUT' );
        is( $stderr,    q{},   '... prints nothing to STDERR' );
        is( $ENV{HOME}, File::Spec->catdir( $homelnk, 'abc' ), '... HOME environment variable is correctly set' );
        is( $ENV{SHELL}, $shell, '... SHELL environment variable is correctly set' );
        is( cwd(), File::Spec->catdir( $homedir, 'abc' ), '... cwd is correctly changed' );
        my $exec_file = ( shift @exec_args )->();
        is( $exec_file, $shell, '... the correct shell was run' );