1 files changed, 9 insertions, 0 deletions
diff --git a/spec/ffi/struct_by_ref_spec.rb b/spec/ffi/struct_by_ref_spec.rb
index 0858423..a775f92 100644
--- a/spec/ffi/struct_by_ref_spec.rb
+++ b/spec/ffi/struct_by_ref_spec.rb
@@ -39,5 +39,14 @@ describe FFI::Struct, ' by_ref' do
 
     expect { @api.struct_test(other_class.new) }.to raise_error(TypeError)
   end
+
+  it "can reveal the mapped type converter" do
+    skip 'this is not yet implemented on JRuby' if RUBY_ENGINE == 'jruby'
+    skip 'this is not yet implemented on Truffleruby' if RUBY_ENGINE == 'truffleruby'
+
+    param_type = @api.attached_functions[:struct_test].param_types[0]
+    expect(param_type).to be_a(FFI::Type::Mapped)
+    expect(param_type.converter).to be_a(FFI::StructByReference)
+  end
 end