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diff --git a/xt/extra/diagnostics/many_to_many_warning.t b/xt/extra/diagnostics/many_to_many_warning.t
new file mode 100644
index 0000000..2c42091
--- /dev/null
+++ b/xt/extra/diagnostics/many_to_many_warning.t
@@ -0,0 +1,106 @@
+use strict;
+use warnings;
+use Test::More;
+
+use lib qw(t/lib);
+use DBICTest;
+
+my $exp_warn = qr/The many-to-many relationship 'bars' is trying to create/;
+
+{
+  my @w;
+  local $SIG{__WARN__} = sub { $_[0] =~ $exp_warn ? push @w, $_[0] : warn $_[0] };
+  my $code = gen_code ( suffix => 1 );
+
+  local $ENV{DBIC_OVERWRITE_HELPER_METHODS_OK};
+  eval "$code";
+  ok (! $@, 'Eval code without warnings suppression')
+    || diag $@;
+
+  ok (@w, "Warning triggered without DBIC_OVERWRITE_HELPER_METHODS_OK");
+}
+
+{
+  my @w;
+  local $SIG{__WARN__} = sub { $_[0] =~ $exp_warn ? push @w, $_[0] : warn $_[0] };
+
+  my $code = gen_code ( suffix => 2 );
+
+  local $ENV{DBIC_OVERWRITE_HELPER_METHODS_OK} = 1;
+  eval "$code";
+  ok (! $@, 'Eval code with warnings suppression')
+    || diag $@;
+
+  ok (! @w, "No warning triggered with DBIC_OVERWRITE_HELPER_METHODS_OK");
+}
+
+sub gen_code {
+
+  my $args = { @_ };
+  my $suffix = $args->{suffix};
+
+  return <<EOF;
+use strict;
+use warnings;
+
+{
+  package #
+    DBICTest::Schema::Foo${suffix};
+  use base 'DBIx::Class::Core';
+
+  __PACKAGE__->table('foo');
+  __PACKAGE__->add_columns(
+    'fooid' => {
+      data_type => 'integer',
+      is_auto_increment => 1,
+    },
+  );
+  __PACKAGE__->set_primary_key('fooid');
+
+
+  __PACKAGE__->has_many('foo_to_bar' => 'DBICTest::Schema::FooToBar${suffix}' => 'bar');
+  __PACKAGE__->many_to_many( foos => foo_to_bar => 'bar' );
+}
+{
+  package #
+    DBICTest::Schema::FooToBar${suffix};
+
+  use base 'DBIx::Class::Core';
+  __PACKAGE__->table('foo_to_bar');
+  __PACKAGE__->add_columns(
+    'foo' => {
+      data_type => 'integer',
+    },
+    'bar' => {
+      data_type => 'integer',
+    },
+  );
+  __PACKAGE__->belongs_to('foo' => 'DBICTest::Schema::Foo${suffix}');
+  __PACKAGE__->belongs_to('bar' => 'DBICTest::Schema::Foo${suffix}');
+}
+{
+  package #
+    DBICTest::Schema::Bar${suffix};
+
+  use base 'DBIx::Class::Core';
+
+  __PACKAGE__->table('bar');
+  __PACKAGE__->add_columns(
+    'barid' => {
+      data_type => 'integer',
+      is_auto_increment => 1,
+    },
+  );
+
+  __PACKAGE__->set_primary_key('barid');
+  __PACKAGE__->has_many('foo_to_bar' => 'DBICTest::Schema::FooToBar${suffix}' => 'foo');
+
+  __PACKAGE__->many_to_many( bars => foo_to_bar => 'foo' );
+
+  sub add_to_bars {}
+}
+EOF
+
+}
+
+done_testing;