Index: ext/Parrot-Embed/t/interp.t
===================================================================
--- ext/Parrot-Embed/t/interp.t	(revision 48740)
+++ ext/Parrot-Embed/t/interp.t	(working copy)
@@ -6,7 +6,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 23;
+use Test::More tests => 28;
 use File::Spec;
 
 my $hello_pbc = File::Spec->catfile( 't', 'greet.pbc' );
@@ -46,6 +46,7 @@
 
 can_ok( $global_greet, 'invoke' );
 my $pmc = $global_greet->invoke( 'S->P', 'Bob' );
+isa_ok( $pmc, 'Parrot::PMC' );
 ok( $pmc, 'invoke() should return a PMC, given that signature' );
 
 is( $pmc->get_string(), 'Hello, Bob!', '... containing a string returned in the PMC' );
@@ -101,6 +102,34 @@
     '... even if interpreter object has gone out of scope'
 );
 
+{
+    my $add = $interp->compile( <<'END_CODE' );
+.sub my_add
+    .param string a
+    .param string b
+
+    .return( a )
+.end
+END_CODE
+
+    ok( $add, 'compile() should compile PIR code and return a PMC' );
+    isa_ok( $add, 'Parrot::PMC' );  
+    my $pmc_add;
+    eval {
+        $pmc_add = $add->invoke( 'PS', 23, 19 );
+    };
+    #Usage: Parrot::PMC::invoke(pmc, signature, argument)
+    TODO: {
+        local $TODO = 'invoke() can only get 2 parameters';
+        isa_ok( $pmc_add, 'Parrot::PMC' );
+    }
+    SKIP: {
+        skip "Previous TODO returns undef", 1;
+        is($pmc_add->get_string(), 42, 'two param call works well');
+    }
+}
+
+
 # Local Variables:
 #   mode: cperl
 #   cperl-indent-level: 4