diff --git a/Basic/IO-Misc/t/misc.t b/Basic/IO-Misc/t/misc.t
index cb45224be..2656fe9c7 100644
--- a/Basic/IO-Misc/t/misc.t
+++ b/Basic/IO-Misc/t/misc.t
@@ -4,13 +4,7 @@ use PDL::LiteF;
 use PDL::IO::Misc;
 use File::Temp qw( tempfile tempdir );
 use Test::More;
-
-sub tapprox {
-        my($x,$y) = @_;
-        my $c = abs($x-$y);
-        my $d = max($c);
-        $d < 0.0001;
-}
+use Test::PDL;
 
 my $tempd = tempdir( CLEANUP => 1 ) or die "Couldn't get tempdir\n";
 my ($fileh,$file) = tempfile( DIR => $tempd );
@@ -154,38 +148,36 @@ EOD
 close($fileh);
 
 ($x,$y) = rcols $file,0,1;
-is( $x->nelem==4 && sum($x)==6 && sum($y)==20, 1,
-    "rcols: default" );
+is_pdl $x, pdl(1,3,-5,7), "rcols: default";
+is_pdl $y, pdl(2,4,6,8), "rcols: default";
 
 ($x,$y) = rcols \*DATA,0,1;
-is( $x->nelem==4 && sum($x)==6 && sum($y)==20, 1,
-    "rcols: pipe" );
+is_pdl $x, pdl(1,3,-5,7), "rcols: fh";
+is_pdl $y, pdl(2,4,6,8), "rcols: fh";
 
 ($x,$y) = rcols $file,0,1, { INCLUDE => '/^-/' };
-is( $x->nelem==1 && $x->at(0)==-5 && $y->at(0)==6, 1,
-    "rcols: include pattern" );
+is_pdl $x, pdl([-5]), "rcols: include pattern";
+is_pdl $y, pdl([6]), "rcols: include pattern";
 
 ($x,$y) = rcols $file,0,1, { LINES => '-2:0' };
-is( $x->nelem==3 && tapprox($x,pdl(-5,3,1)) && tapprox($y,pdl(6,4,2)), 1,
-    "rcols: lines option" );
+is_pdl $x, pdl(-5,3,1), "rcols: lines option";
+is_pdl $y, pdl(6,4,2), "rcols: lines option";
 
 use PDL::Types;
 ($x,$y) = rcols $file, { DEFTYPE => long };
-is( $x->nelem==4 && $x->get_datatype==$PDL_L && $y->get_datatype==$PDL_L, 1,
-    "rcols: deftype option" );
+is_pdl $x, long(1,3,-5,7), "rcols: deftype option";
+is_pdl $y, long(2,4,6,8), "rcols: deftype option";
 
 ($x,$y) = rcols $file, { TYPES => [ ushort ] };
-is( $x->nelem==4 && $x->get_datatype==$PDL_US && $y->get_datatype==$PDL_D, 1,
-    "rcols: types option" );
+is_pdl $x, ushort(1,3,-5,7), "rcols: types option";
+is_pdl $y, double(2,4,6,8), "rcols: types option";
 
-is( UNIVERSAL::isa($PDL::IO::Misc::deftype,"PDL::Type"), 1,
-    "PDL::IO::Misc::deftype is a PDL::Type object" );
-is( $PDL::IO::Misc::deftype->[0], double->[0],
-    "PDL::IO::Misc::deftype check" );
+isa_ok $PDL::IO::Misc::deftype, "PDL::Type", "PDL::IO::Misc::deftype";
+is $PDL::IO::Misc::deftype, 'double', "PDL::IO::Misc::deftype check";
 
 $PDL::IO::Misc::deftype = short;
 ($x,$y) = rcols $file;
-is( $x->get_datatype, short->[0], "rcols: can read in as 'short'" );
+is( $x->get_datatype, short->enum, "rcols: can read in as 'short'" );
 
 unlink $file || warn "Could not unlink $file: $!";
 
diff --git a/Basic/IO-Pnm/t/pnm.t b/Basic/IO-Pnm/t/pnm.t
index 05fde73dd..7b03d1953 100644
--- a/Basic/IO-Pnm/t/pnm.t
+++ b/Basic/IO-Pnm/t/pnm.t
@@ -7,13 +7,7 @@ use PDL::Dbg;
 use File::Temp qw(tempdir);
 use File::Spec;
 use Test::More;
-
-# we need tests with index shuffling once vaffines are fixed
-
-sub tapprox {
-	my($pa,$pb,$mdiff) = @_;
-	all approx($pa, $pb,$mdiff || 0.01);
-}
+use Test::PDL;
 
 my $tmpdir = tempdir( CLEANUP => 1 );
 sub rpnm_unlink {
@@ -63,18 +57,16 @@ for my $raw (0,1) {
   foreach my $form (@formats) {
     my $in = rpnm_unlink($im2, $form->[1], 'PGM', $raw);
     my $comp = ($form->[3] ? $im2->dummy(0,3) : $im2);
-    ok(tapprox($in,$comp)) or diag "got=$in\nexpected=$comp";
+    is_pdl $in,$comp;
     $comp = $form->[3] ? ($im3->dummy(0,3)>0)*255 : ($im3 > 0);
     $comp = $comp->ushort*65535 if $form->[0] eq 'SGI'; # yet another format quirk
     $in = rpnm_unlink($im3, $form->[1], 'PBM', $raw);
-    ok(tapprox($in,$comp)) or diag "got=$in\nexpected=$comp";
+    is_pdl $in,$comp;
     next if $form->[0] eq 'GIF';
     $in = rpnm_unlink($im1, $form->[1], 'PGM', $raw);
     my $scale = $form->[3] ? $im1->dummy(0,3) : $im1;
     $comp = $scale / $form->[2];
-    ok(tapprox($in,$comp,$form->[4]), $form->[0])
-      or diag "got=$in\nexpected=$comp", $in->info;
-    note $in->px if $PDL::debug and $form->[0] ne 'TIFF';
+    is_pdl $in, $comp, {atol=>$form->[4], test_name=>$form->[0]};
   }
 }
 
diff --git a/Basic/Lib-ImageRGB/t/picnorgb.t b/Basic/Lib-ImageRGB/t/picnorgb.t
index b7817f647..bacd86ea5 100644
--- a/Basic/Lib-ImageRGB/t/picnorgb.t
+++ b/Basic/Lib-ImageRGB/t/picnorgb.t
@@ -8,7 +8,6 @@ use File::Spec;
 use strict;
 use warnings;
 
-# we need tests with index shuffling once vaffines are fixed
 use Test::More;
 
 sub tapprox {
diff --git a/Basic/Lib-ImageRGB/t/picrgb.t b/Basic/Lib-ImageRGB/t/picrgb.t
index 596f55d2a..847b7d908 100644
--- a/Basic/Lib-ImageRGB/t/picrgb.t
+++ b/Basic/Lib-ImageRGB/t/picrgb.t
@@ -8,8 +8,6 @@ use PDL::Dbg;
 use File::Temp qw(tempdir);
 use File::Spec;
 
-# we need tests with index shuffling once vaffines are fixed
-
 sub tapprox {
 	my($pa,$pb,$mdiff) = @_;
 	all approx($pa, $pb,$mdiff || 0.01);