fix mistake in WebGUI::Test

t/lib/WebGUI/Test.pm

@@ -139,6 +139,8 @@ If true, the session won't be registered for automatic deletion.
 =cut
 
 sub newSession {
+    shift
+        if eval { $_[0]->isa($CLASS) };
     my $noCleanup = shift;
     require WebGUI::Session;
     my $session = WebGUI::Session->open( $CLASS->config, newEnv() );
@@ -149,7 +151,10 @@ sub newSession {
 }
 
 sub newEnv {
+    shift
+        if eval { $_[0]->isa($CLASS) };
     my $form = shift;
+
     require HTTP::Message::PSGI;
     require HTTP::Request::Common;
     my $config = $CLASS->config;
@@ -1027,7 +1032,7 @@ This is a class method.
 my @guarded;
 sub addToCleanup {
     shift
-        if try { $_[0]->isa($CLASS) };
+        if eval { $_[0]->isa($CLASS) };
     push @guarded, cleanupGuard(@_);
 }