1 files changed, 128 insertions, 0 deletions
diff --git a/contrib/perl5/t/op/method.t b/contrib/perl5/t/op/method.t
new file mode 100755
index 000000000000..f1b1888ef649
--- /dev/null
+++ b/contrib/perl5/t/op/method.t
@@ -0,0 +1,128 @@
+#!./perl
+
+#
+# test method calls and autoloading.
+#
+
+print "1..26\n";
+
+@A::ISA = 'B';
+@B::ISA = 'C';
+
+sub C::d {"C::d"}
+sub D::d {"D::d"}
+
+my $cnt = 0;
+sub test {
+  print "# got `$_[0]', expected `$_[1]'\nnot " unless $_[0] eq $_[1]; 
+  # print "not " unless shift eq shift;
+  print "ok ", ++$cnt, "\n"
+}
+
+test( A->d, "C::d");		# Update hash table;
+
+*B::d = \&D::d;			# Import now.
+test (A->d, "D::d");		# Update hash table;
+
+{
+    local @A::ISA = qw(C);	# Update hash table with split() assignment
+    test (A->d, "C::d");
+    $#A::ISA = -1;
+    test (eval { A->d } || "fail", "fail");
+}
+test (A->d, "D::d");
+
+{
+    local *B::d;
+    eval 'sub B::d {"B::d1"}';	# Import now.
+    test (A->d, "B::d1");	# Update hash table;
+    undef &B::d;
+    test ((eval { A->d }, ($@ =~ /Undefined subroutine/)), 1);
+}
+
+test (A->d, "D::d");		# Back to previous state
+
+eval 'sub B::d {"B::d2"}';	# Import now.
+test (A->d, "B::d2");		# Update hash table;
+
+# What follows is hardly guarantied to work, since the names in scripts
+# are already linked to "pruned" globs. Say, `undef &B::d' if it were
+# after `delete $B::{d}; sub B::d {}' would reach an old subroutine.
+
+undef &B::d;
+delete $B::{d};
+test (A->d, "C::d");		# Update hash table;
+
+eval 'sub B::d {"B::d3"}';	# Import now.
+test (A->d, "B::d3");		# Update hash table;
+
+delete $B::{d};
+*dummy::dummy = sub {};		# Mark as updated
+test (A->d, "C::d");
+
+eval 'sub B::d {"B::d4"}';	# Import now.
+test (A->d, "B::d4");		# Update hash table;
+
+delete $B::{d};			# Should work without any help too
+test (A->d, "C::d");
+
+{
+    local *C::d;
+    test (eval { A->d } || "nope", "nope");
+}
+test (A->d, "C::d");
+
+*A::x = *A::d;			# See if cache incorrectly follows synonyms
+A->d;
+test (eval { A->x } || "nope", "nope");
+
+eval <<'EOF';
+sub C::e;
+BEGIN { *B::e = \&C::e }	# Shouldn't prevent AUTOLOAD in original pkg
+sub Y::f;
+$counter = 0;
+
+@X::ISA = 'Y';
+@Y::ISA = 'B';
+
+sub B::AUTOLOAD {
+  my $c = ++$counter;
+  my $method = $B::AUTOLOAD; 
+  my $msg = "B: In $method, $c";
+  eval "sub $method { \$msg }";
+  goto &$method;
+}
+sub C::AUTOLOAD {
+  my $c = ++$counter;
+  my $method = $C::AUTOLOAD; 
+  my $msg = "C: In $method, $c";
+  eval "sub $method { \$msg }";
+  goto &$method;
+}
+EOF
+
+test(A->e(), "C: In C::e, 1");	# We get a correct autoload
+test(A->e(), "C: In C::e, 1");	# Which sticks
+
+test(A->ee(), "B: In A::ee, 2"); # We get a generic autoload, method in top
+test(A->ee(), "B: In A::ee, 2"); # Which sticks
+
+test(Y->f(), "B: In Y::f, 3");	# We vivify a correct method
+test(Y->f(), "B: In Y::f, 3");	# Which sticks
+
+# This test is not intended to be reasonable. It is here just to let you
+# know that you broke some old construction. Feel free to rewrite the test
+# if your patch breaks it.
+
+*B::AUTOLOAD = sub {
+  my $c = ++$counter;
+  my $method = $AUTOLOAD; 
+  *$AUTOLOAD = sub { "new B: In $method, $c" };
+  goto &$AUTOLOAD;
+};
+
+test(A->eee(), "new B: In A::eee, 4");	# We get a correct $autoload
+test(A->eee(), "new B: In A::eee, 4");	# Which sticks
+
+# this test added due to bug discovery
+test(defined(@{"unknown_package::ISA"}) ? "defined" : "undefined", "undefined");