add tests for antipairs

S32-hash/antipairs.t

@@ -0,0 +1,25 @@
+use v6;
+use Test;
+
+# L<S32::Containers/Hash/antipairs>
+
+plan 5;
+
+{
+    my %h = a => 'b', c => 'd';
+    isa-ok %h.antipairs, Seq, 'Hash.antipairs returns a Seq';
+    #?niecza todo 'Cannot use value like Pair as a number'
+    is-deeply %h.antipairs.sort.list, (b => 'a', d => 'c'), 'simple Hash.antipairs works';
+    is-deeply %h, { a => 'b', c => 'd' }, 'original remains unchanged';
+}
+
+{
+    # with lists
+    my %h = a => <b c>, d => 'e';
+    #?niecza todo 'Cannot use value like Pair as a number'
+    is-deeply %h.antipairs.sort.list, (<b c> => 'a', e => 'd'),
+              'Hash.antipairs does not flatten list values';
+    is-deeply %h, {a => <b c>, d => 'e'}, 'original remains unchanged';
+}
+
+# vim: ft=perl6