[#249 state:resolved] Here are the results:

new-host-3:melody mike$ prove -w t/97-impexp.t
Name "main::running_under_some_shell" used only once: possible typo at /usr/bin/prove5.10.0 line 3.
t/97-impexp.t .. Name "DBD::SQLite::sqlite_version" used only once: possible typo at /System/Library/Perl/5.10.0/darwin-thread-multi-2level/DynaLoader.pm line 230.
t/97-impexp.t .. ok
All tests successful.
Files=1, Tests=6,  6 wallclock secs ( 0.04 usr  0.01 sys +  4.90 cusr  0.37 csys =  5.32 CPU)
Result: PASS

I do not get the DBD::SQLite warning on Linux.

lib/MT/ImportExport.pm

@@ -58,7 +58,7 @@ sub import_contents {
     my $allow_comments = $blog->allow_comments_default;
     my $allow_pings = $blog->allow_pings_default ? 1 : 0;
     my $convert_breaks = $param{ConvertBreaks};
-    $convert_breaks = $blog->convert_paras if $convert_breaks == -1;
+    $convert_breaks = $blog->convert_paras unless $convert_breaks; #if $convert_breaks eq -1;
     my $def_status = $param{default_status} || $blog->status_default;
     my(%authors, %categories);
 

t/97-impexp.t

@@ -67,7 +67,7 @@ $param{'Blog'} = $blog;
 $param{'Callback'} = 1;
 $param{'ParentAuthor'} = $user;
 $param{'NewAuthorPassword'} = 'PASSWORD';
-$param{'ConvertBreaks'} = '';
+$param{'ConvertBreaks'} = $blog->convert_paras;
 $param{'Callback'} = sub { my ($string) = @_; print " $string\n"; 1};
 my $result = $ie->import_contents(%param);
 

t/lib/MT/Test.pm

@@ -130,12 +130,12 @@ sub init_app {
         };
         *MT::App::login = sub {
             my $app = shift;
-            if ( my $user = $app->param('__test_user') ) {
+            if ( my $user = $app->query->param('__test_user') ) {
 
                 # attempting to fake user session
                 if (  !$session_id
                     || $user->name ne $session_username
-                    || $app->param('__test_new_session') )
+                    || $app->query->param('__test_new_session') )
                 {
                     $app->start_session( $user, 1 );
                     $session_id       = $app->{session}->id;
@@ -144,7 +144,7 @@ sub init_app {
                 else {
                     $app->session_user( $user, $session_id );
                 }
-                $app->param( 'magic_token', $session_id );
+                $app->query->param( 'magic_token', $session_id );
                 $app->user($user);
                 return ( $user, 0 );
             }