+my ($llx,$lly,$width,$height) = ( 0, 0, 10, 10 );
+ok(!defined C4::Labels::Label::_guide_box(),
+ "Test guide box with undefined parameters returns undef");
+ok(!defined C4::Labels::Label::_guide_box(undef,$lly,$width,$height),
+ "Test guide box with undefined 'x' coordinate returns undef");
+ok(!defined C4::Labels::Label::_guide_box($llx,undef,$width,$height),
+ "Test guide box with undefined 'y' coordinate returns undef");
+ok(!defined C4::Labels::Label::_guide_box($llx,$lly,undef,$height),
+ "Test guide box with undefined 'width' returns undef");
+ok(!defined C4::Labels::Label::_guide_box($llx,$lly,$width,undef),
+ "Test guide box with undefined 'height' returns undef");
+is(
+ C4::Labels::Label::_guide_box($llx, $lly, $width, $height),
+ 'q
+0.5 w
+1.0 0.0 0.0 RG
+1.0 1.0 1.0 rg
+0 0 10 10 re
+B
+Q
+',
+ 'Return guide box if all four parameters are defined'
+);