+
+eval {
+ $path->add($foo);
+};
+is $@, '', 'adding something to a path set doesn\'t croak';
+
+check Tikz->seq($path, $path), 'two identical path sets', <<'RES';
+\draw foo bar baz foo ;
+\draw foo bar baz foo ;
+RES
+
+eval {
+ $path->add($seq2);
+};
+like $@, failed_valid('LaTeX::TikZ::Set::Op'),
+ 'adding a sequence to a path croaks';