1 files changed, 57 insertions, 0 deletions
diff --git a/t/exceptions/class-mop-class-immutable-trait.t b/t/exceptions/class-mop-class-immutable-trait.t
new file mode 100644
index 0000000..abefba7
--- /dev/null
+++ b/t/exceptions/class-mop-class-immutable-trait.t
@@ -0,0 +1,57 @@
+use strict;
+use warnings;
+
+use Test::More;
+use Test::Fatal;
+
+use Moose();
+
+{
+    my $exception = exception {
+        package Foo;
+        use Moose;
+        __PACKAGE__->meta->make_immutable;
+        __PACKAGE__->meta->superclasses("Bar");
+    };
+
+    like(
+        $exception,
+        qr/The 'superclasses' method is read-only when called on an immutable instance/,
+        "calling 'foo' on an immutable instance");
+
+    isa_ok(
+        $exception,
+        "Moose::Exception::CallingReadOnlyMethodOnAnImmutableInstance",
+        "calling 'foo' on an immutable instance");
+
+    is(
+        $exception->method_name,
+        "superclasses",
+        "calling 'foo' on an immutable instance");
+}
+
+{
+    my $exception = exception {
+        package Foo;
+        use Moose;
+        __PACKAGE__->meta->make_immutable;
+        __PACKAGE__->meta->add_method( foo => sub { "foo" } );
+    };
+
+    like(
+        $exception,
+        qr/The 'add_method' method cannot be called on an immutable instance/,
+        "calling 'add_method' on an immutable instance");
+
+    isa_ok(
+        $exception,
+        "Moose::Exception::CallingMethodOnAnImmutableInstance",
+        "calling 'add_method' on an immutable instance");
+
+    is(
+        $exception->method_name,
+        "add_method",
+        "calling 'add_method' on an immutable instance");
+}
+
+done_testing;