Bug 15209: Add tests

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>

t/Koha.t

@@ -25,7 +25,7 @@ use Module::Load::Conditional qw/check_install/;
 
 BEGIN {
     if ( check_install( module => 'Test::DBIx::Class' ) ) {
-        plan tests => 30;
+        plan tests => 34;
     } else {
         plan skip_all => "Need Test::DBIx::Class"
     }
@@ -119,4 +119,9 @@ is( C4::Koha::GetNormalizedISBN('9781250075345 (hardcover) | 1250075343 (hardcov
 is( C4::Koha::GetNormalizedISBN('9781250067128 | 125006712X'), '125006712X', 'Test GetNormalizedISBN' );
 is( C4::Koha::GetNormalizedISBN('9780373211463 | 0373211465'), '0373211465', 'Test GetNormalizedISBN' );
 
+is( C4::Koha::GetNormalizedUPC(), undef, 'GetNormalizedUPC should return undef if no record is passed' );
+is( C4::Koha::GetNormalizedISBN(), undef, 'GetNormalizedISBN should return undef if no record and no isbn are passed' );
+is( C4::Koha::GetNormalizedEAN(), undef, 'GetNormalizedEAN should return undef if no record and no isbn are passed' );
+is( C4::Koha::GetNormalizedOCLCNumber(), undef, 'GetNormalizedOCLCNumber should return undef if no record and no isbn are passed' );
+
 1;