fix builds under USE_PAD_RESET

[perl5.git] / t / op / join.t

diff --git a/t/op/join.t b/t/op/join.t
index 477c479..7f9a196 100644 (file)
--- a/t/op/join.t
+++ b/t/op/join.t
@@ -2,11 +2,11 @@
 
 BEGIN {
     chdir 't' if -d 't';
-    @INC = '../lib';
     require './test.pl';
+    set_up_inc('../lib');
 }
 
-plan tests => 26;
+plan tests => 29;
 
 @x = (1, 2, 3);
 is( join(':',@x), '1:2:3', 'join an array with character');
@@ -76,6 +76,9 @@ is( $f, 'baeak', 'join back to self, self is join character');
   use warnings "uninitialized";
   my $s = join(undef, ());
   is( $s, '', 'join should return empty string for empty list, when separator is undef');
+  # this warning isn't normative, the implementation may choose to
+  # not evaluate the separator as a string if the list has fewer than
+  # two elements
   like $w, qr/^Use of uninitialized value in join/, "should warn if separator is undef";
 }
 
@@ -114,3 +117,14 @@ is( $f, 'baeak', 'join back to self, self is join character');
   is( $ju2, $u );
 }
 
+package o { use overload q|""| => sub { ${$_[0]}++ } }
+{
+  my $o = bless \(my $dummy = "a"), o::;
+  $_ = join $o, 1..10;
+  is $_, "1a2a3a4a5a6a7a8a9a10", 'join, $overloaded, LIST';
+  is $$o, "b", 'overloading was called once on overloaded separator';
+}
+
+for(1,2) { push @_, \join "x", 1 }
+isnt $_[1], $_[0],
+    'join(const, const) still returns a new scalar each time';