1 files changed, 32 insertions, 0 deletions
diff --git a/t/readonly.t b/t/readonly.t
new file mode 100644
index 0000000..f0b82ea
--- /dev/null
+++ b/t/readonly.t
@@ -0,0 +1,32 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use Test::More;
+
+use Fun;
+
+my $thing = 1;
+
+fun foo ($bar) { $bar = 1 }
+
+ok(!eval { foo(); 1 });
+ok(!eval { foo(1); 1 });
+ok(!eval { foo($thing); 1 });
+ok(!eval { foo($thing + 1); 1 });
+
+fun bar ($baz) { $baz }
+
+ok(eval { bar(); 1 });
+ok(eval { bar(1); 1 });
+ok(eval { bar($thing); 1 });
+ok(eval { bar($thing + 1); 1 });
+
+ok(eval { $thing = 2; 1 });
+is($thing, 2);
+
+fun baz ($quux) { $_[0] = 1 }
+
+ok(eval { baz($thing); 1 });
+is($thing, 1);
+
+done_testing;