Make t/85-stress-unwind.t predictable

[perl/modules/Scope-Upper.git] / t / 85-stress-unwind.t

diff --git a/t/85-stress-unwind.t b/t/85-stress-unwind.t
index 75bad3e18dbefe98b3a409c4cb496d7d161cbfaf..acd44521984471b05fbd0712838da7d3d0f3e0cc 100644 (file)
--- a/t/85-stress-unwind.t
+++ b/t/85-stress-unwind.t
@@ -3,18 +3,23 @@
 use strict;
 use warnings;
 
-use Test::More 'no_plan';
+use lib 't/lib';
+use Test::Leaner 'no_plan';
 
-use Scope::Upper qw/unwind/;
+use Scope::Upper qw<unwind UP HERE>;
 
-our ($call, @args, $args);
+our ($call, @args);
 
 $call = sub {
  my ($height, $level, $i) = @_;
- return [ [ "unwind(\@args => $level)\n", '' ] ];
+ $level = $level ? 'UP ' x $level : 'HERE';
+ return [ [ "unwind(\@args => $level)\n", [ \@args ] ] ];
 };
 
-sub list { @_ }
+# @_[0 .. $#_] also ought to work, but it sometimes evaluates to nonsense in
+# scalar context on perl 5.8.5 and below.
+
+sub list { wantarray ? @_ : $_[$#_] }
 
 my @blocks = (
  [ 'sub {',     '}->()' ],
@@ -22,36 +27,52 @@ my @blocks = (
 );
 
 my @contexts = (
- [ '',        '; ()' ],
- [ 'scalar(', ')' ],
- [ 'list(',   ')' ],
+ [ '',        '; ()', 'v' ],
+ [ 'scalar(', ')',    's' ],
+ [ 'list(',   ')',    'l' ],
 );
 
-@blocks   = map [ map "$_\n", @$_ ], @blocks;
-@contexts = map [ map "$_\n", @$_ ], @contexts;
+for my $block (@blocks) {
+ $_ .= "\n" for @$block[0, 1];
+}
+for my $cxt (@contexts) {
+ $_ .= "\n" for @$cxt[0, 1];
+}
+
+sub contextify {
+ my ($cxt, $active, $exp, @items) = @_;
+ return $exp unless $active;
+ if ($cxt eq 'v') {
+  return [ ];
+ } elsif ($cxt eq 's') {
+  return [ $cxt, @$exp ];
+ } else {
+  return [ @items, @$exp ];
+ }
+}
+
+my $integer = 0;
+my $items   = 0;
 
 sub gen {
  my ($height, $level, $i) = @_;
  push @_, $i = 0 if @_ == 2;
  my @res;
  my $up = $i == $height + 1 ? $call->(@_) : gen($height, $level, $i + 1);
- if ($i + $level == $height + 1) {
-  for (@$up) {
-   $_->[1] = "return($args)\n";
-  }
- }
+ my $active = $i <= ($height - $level);
  for my $base (@$up) {
   my ($code, $exp) = @$base;
   for my $blk (@blocks) {
    for my $cx (@contexts) {
     push @res, [
      $blk->[0] . $cx->[0] . $code . $cx->[1] . $blk->[1],
-     $blk->[0] . $cx->[0] . $exp .  $cx->[1] . $blk->[1],
+     contextify($cx->[2], $active, $exp),
     ];
-    my $list = join ', ', map { int rand 10 } 0 .. rand 3;
+    my @items = map $integer++, 0 .. ($items++ % 3);
+    my $list  = join ', ', @items;
     push @res, [
-     $blk->[0] . $cx->[0] . "($list, " . $code . ')' . $cx->[1] . $blk->[1],
-     $blk->[0] . $cx->[0] . "($list, " . $exp .  ')' . $cx->[1] . $blk->[1],
+     $blk->[0] . $cx->[0] . "($list, $code)" . $cx->[1] . $blk->[1],
+     contextify($cx->[2], $active, $exp, @items),
     ];
    }
   }
@@ -59,27 +80,52 @@ sub gen {
  return \@res;
 }
 
+sub linearize { join ', ', map { defined($_) ? $_ : '(undef)' } @_ }
+
+sub expect {
+ my @spec = @{$_[0]};
+ my @acc;
+ for my $s (reverse @spec) {
+  if (ref $s) {
+   unshift @acc, @$s;
+  } elsif ($s =~ /^[0-9]+$/) {
+   unshift @acc, $s;
+  } elsif ($s eq 's') {
+   @acc = (@acc ? $acc[-1] : undef);
+  } else {
+   return 'XXX';
+  }
+ }
+ return linearize @acc;
+}
+
 sub runtests {
+ my ($height, $level) = @_;
+ my $i;
  my $tests = gen @_;
  for (@$tests) {
+  ++$i;
   no warnings 'void';
-  my @res = eval $_->[0];
-  my @exp = eval $_->[1] unless $@;
-  if ($@ || !is_deeply \@res, \@exp) {
-   diag "=== vvv Test vvv ===";
-   diag $_->[0];
-   diag "------- Got --------";
-   diag join(', ', map { defined($_) ? $_ : '(undef)' } @res);
-   diag "----- Expected -----";
-   diag join(', ', map { defined($_) ? $_ : '(undef)' } @exp);
-   diag "=== ^^^^^^^^^^^^ ===";
+  my $res = linearize eval $_->[0];
+  my $exp;
+  if ($@) {
+   $res = '*TEST DID NOT COMPILE*';
+  } else {
+   $exp = expect $_->[1];
+  }
+  if ($res ne $exp) {
+   diag <<DIAG;
+=== This testcase failed ===
+$_->[0];
+==== vvvvv Errors vvvvvv ===
+DIAG
   }
+  is $res, $exp, "stress unwind $height $level $i";
  }
 }
 
-for ([ ], [ 'A' ], [ qw/B C/ ]) {
+for ([ ], [ 'A' ], [ qw<B C> ]) {
  @args = @$_;
- $args = '(' . join(', ', map "'$_'", @args) . ')';
  runtests 0, 0;
  runtests 0, 1;
  runtests 1, 0;