diff -r 46ba051d29bd -r f095f28db247 t/00-basic.t
--- a/t/00-basic.t	Sat Jun 04 22:08:13 2016 +0200
+++ b/t/00-basic.t	Sat Jun 04 23:05:29 2016 +0200
@@ -6,19 +6,33 @@
 
 use_ok 'Exim::Grey' => qw(unseen seen) or BAIL_OUT;
 
-my $db = File::Temp->new();
+subtest 'simple' => sub {
+    my $db = File::Temp->new();
+    is seen('a->x', 0, "$db"), 'no' => 'not seen a->x';
+    is unseen('a->b', 0,   "$db"), 'yes' => 'unseen a->b';
+    is unseen('a->b', 600, "$db"), 'yes' => 'unseen a->b with 600s delay';
+    is unseen('a->b', 0,   "$db"), 'no'  => 'not unseen a->b';
+    is seen('a->b', 600, "$db"), 'no' => 'not seen a->b with 600s delay';
+};
 
-is seen('a->x', 1, "$db"), 'no' => 'not seen a->x';
-is unseen('a->b', 1, "$db"), 'yes' => 'unseen a->b';
-is unseen('a->b', 1, "$db"), 'yes' => 'unseen a->b';
+subtest 'whitelist' => sub {
+    my $db = File::Temp->new();
+    is unseen('x->y/1.1.1.1', 1, "$db"), 'yes' => 'unseen x->y/1.1.1.1';
+    is unseen('x->y/1.1.1.1', 1, "$db"), 'yes' => 'unseen x->y/1.1.1.1';
 
-is unseen('x->y/1.1.1.1', 1, "$db"), 'yes' => 'unseen x->y/1.1.1.1';
-is unseen('x->y/1.1.1.1', 1, "$db"), 'yes' => 'unseen x->y/1.1.1.1';
+    is unseen('x->y/1.1.1.1', 0, "$db"), 'no' => 'not unseen x->y/1.1.1.1';
+    is unseen('x->z/1.1.1.1', 0, "$db"), 'no' => 'not unseen x->z/1.1.1.1';
+    is seen('x->z/1.1.1.1', 0, "$db"), 'yes' => 'seen x->z/1.1.1.1';
+
+};
 
-is unseen('a->b',         0, "$db"), 'no' => 'not unseen a->b';
-is unseen('x->y/1.1.1.1', 0, "$db"), 'no' => 'not unseen x->y/1.1.1.1';
-is unseen('x->z/1.1.1.1', 0, "$db"), 'no' => 'not unseen x->z/1.1.1.1';
-is seen('x->z/1.1.1.1', 0, "$db"), 'yes' => 'seen x->z/1.1.1.1';
+subtest 'whitelist multiple subkeys' => sub {
+    my $db = File::Temp->new();
 
-is unseen('a->b', 600, "$db"), 'yes' => 'unseen a->b with 600s delay';
-is seen('a->b', 600, "$db"), 'no' => 'not seen a->b with 600s delay';
+    is unseen('x->y/1.1.1.1', 0, "$db"), 'yes' => 'unseen x->y/1.1.1.1';
+    is unseen('x->y/2.2.2.2', 0, "$db"), 'no' => 'not unseen x->y/2.2.2.2';
+
+    is unseen('a->b/1.1.1.1', 0, "$db"), 'no' => 'not unseen (whitelisted source)';
+    is unseen('a->c/2.2.2.2', 0, "$db"), 'no' => 'not unseen (whitelisted source)';
+    is unseen('x->y/3.3.3.3', 0, "$db"), 'no' => 'not unseen x->y/3.3.3.3 (known key)';
+};