diff --git a/lib/Perl/Critic/Role/Cacheable.pm b/lib/Perl/Critic/Role/Cacheable.pm
index f496439..789f641 100644
--- a/lib/Perl/Critic/Role/Cacheable.pm
+++ b/lib/Perl/Critic/Role/Cacheable.pm
@@ -92,7 +92,7 @@ The name of the file where the cache will be stored.
   }
 
   sub _cacheable_config_digest ($self) {
-    return $self->{_cacheable}->{rc_digest};
+    return $self->{_cacheable}->{config_digest};
   }
 
   sub _cacheable_digest_ok ($self) {
@@ -156,7 +156,8 @@ critiqued and had no violations will not be checked again.
 
   around critique => sub ($orig, $self, $source_code) {
 
-     my $filename = !is_ref $source_code ? Path::Tiny->new($source_code)->absolute->stringify : undef;
+     $DB::single = 1;
+     my $filename = !Ref::Util::is_ref $source_code ? Path::Tiny->new($source_code)->absolute->stringify : undef;
      if($filename) {
        return () if $self->_cacheable_check_cache_ok($filename);
      }
diff --git a/t/perl_critic_role_cacheable.t b/t/perl_critic_role_cacheable.t
index 28c7567..6deb4eb 100644
--- a/t/perl_critic_role_cacheable.t
+++ b/t/perl_critic_role_cacheable.t
@@ -1,22 +1,177 @@
 use Test2::V0 -no_srand => 1;
+use experimental qw( signatures postderef );
 use Perl::Critic::Role::Cacheable;
+use Path::Tiny;
 
-package Perl::Critic::Cacheable {
+my @faux_violations;
+my $call_count;
+
+package MyCritic {
   use parent 'Perl::Critic';
   use Role::Tiny::With ();
 
   Role::Tiny::With::with 'Perl::Critic::Role::Cacheable';
+
+  sub critique ($self, $source_code ) {
+    $call_count++;
+    my @old = @faux_violations;
+    @faux_violations = ();
+    return @old;
+  }
+
+  sub new ($self, @args) {
+    $call_count = 0;
+    return $self->SUPER::new(@args);
+  }
 }
 
 subtest 'very basic' => sub {
 
-  my $critic = Perl::Critic::Cacheable->new;
+  my $critic = MyCritic->new;
   isa_ok $critic, 'Perl::Critic';
   ok $critic->can('new'), 'has new method';
   ok !$critic->can('around'), 'does not have around method';
 
 };
 
-done_testing;
+subtest 'cache' => sub {
+  my $root = Path::Tiny->tempdir;
+
+  my @perl_source = (map { $root->child($_) } qw( source1.pl source2.pm));
+  $perl_source[0]->spew('foo');
+  $perl_source[1]->spew('bar');
+
+  my $profile = $root->child('profile');
+  $profile->spew('');
+
+  my $cache = $root->child('cache');
+
+  subtest 'first run (no cache)' => sub {
+    my $critic = MyCritic->new(
+      -profile => "$profile",
+      '-cacheable-filename' => "$cache"
+    );
+
+    is(
+      [$critic->critique("$perl_source[0]")],
+      [],
+      "call \$critic->critique(\"$perl_source[0]\") = []",
+    );
+
+    @faux_violations = ('a','b','x');
+
+    is(
+      [$critic->critique("$perl_source[1]")],
+      ['a','b','x'],
+      "call \$critic->critique(\"$perl_source[1]\") = [a,b,x]",
+    );
+
+    is $call_count, 2, 'expected call count';
+    $critic->cacheable_save;
+
+    ok -r $cache, 'created cache file';
+  };
+
+  subtest 'second run (with cache)' => sub {
+    my $critic = MyCritic->new(
+      -profile => "$profile",
+      '-cacheable-filename' => "$cache"
+    );
+
+    is(
+      [$critic->critique("$perl_source[0]")],
+      [],
+      "call \$critic->critique(\"$perl_source[0]\") = []",
+    );
+
+    @faux_violations = ('a','b','x');
+
+    is(
+      [$critic->critique("$perl_source[1]")],
+      ['a','b','x'],
+      "call \$critic->critique(\"$perl_source[1]\") = [a,b,x]",
+    );
+
+    is $call_count, 1, 'expected call count';
+  };
+
+  subtest 'third run with change to source file' => sub {
+    $perl_source[0]->spew('baz');
 
+    my $critic = MyCritic->new(
+      -profile => "$profile",
+      '-cacheable-filename' => "$cache"
+    );
 
+    is(
+      [$critic->critique("$perl_source[0]")],
+      [],
+      "call \$critic->critique(\"$perl_source[0]\") = []",
+    );
+
+    @faux_violations = ('a','b','x');
+
+    is(
+      [$critic->critique("$perl_source[1]")],
+      ['a','b','x'],
+      "call \$critic->critique(\"$perl_source[1]\") = [a,b,x]",
+    );
+
+    is $call_count, 2, 'expected call count';
+  };
+
+  subtest 'forth run with change to profile' => sub {
+    $perl_source[0]->spew('foo');
+    $profile->spew('; just a comment');
+
+    my $critic = MyCritic->new(
+      -profile => "$profile",
+      '-cacheable-filename' => "$cache"
+    );
+
+    is(
+      [$critic->critique("$perl_source[0]")],
+      [],
+      "call \$critic->critique(\"$perl_source[0]\") = []",
+    );
+
+    @faux_violations = ('a','b','x');
+
+    is(
+      [$critic->critique("$perl_source[1]")],
+      ['a','b','x'],
+      "call \$critic->critique(\"$perl_source[1]\") = [a,b,x]",
+    );
+
+    is $call_count, 2, 'expected call count';
+  };
+
+  subtest 'forth run with change to arguments' => sub {
+    my $profile = $root->child('profile2');
+    $profile->spew('');
+
+    my $critic = MyCritic->new(
+      -profile => "$profile",
+      '-cacheable-filename' => "$cache"
+    );
+
+    is(
+      [$critic->critique("$perl_source[0]")],
+      [],
+      "call \$critic->critique(\"$perl_source[0]\") = []",
+    );
+
+    @faux_violations = ('a','b','x');
+
+    is(
+      [$critic->critique("$perl_source[1]")],
+      ['a','b','x'],
+      "call \$critic->critique(\"$perl_source[1]\") = [a,b,x]",
+    );
+
+    is $call_count, 2, 'expected call count';
+  };
+
+};
+
+done_testing;