1 files changed, 43 insertions, 0 deletions
diff --git a/spec/ffi/type_spec.rb b/spec/ffi/type_spec.rb
new file mode 100644
index 0000000..eb48a43
--- /dev/null
+++ b/spec/ffi/type_spec.rb
@@ -0,0 +1,43 @@
+#
+# This file is part of ruby-ffi.
+# For licensing, see LICENSE.SPECS
+#
+
+require File.expand_path(File.join(File.dirname(__FILE__), "spec_helper"))
+
+describe "FFI::Type" do
+  it 'has a memsize function', skip: RUBY_ENGINE != "ruby" do
+    base_size = ObjectSpace.memsize_of(Object.new)
+
+    size = ObjectSpace.memsize_of(FFI::Type.new(42))
+    expect(size).to be > base_size
+    base_size = size
+
+    converter = Module.new do
+      extend FFI::DataConverter
+
+      def self.native_type
+        @native_type_called = true
+        FFI::Type::INT32
+      end
+
+      def self.to_native(val, ctx)
+        @to_native_called = true
+        ToNativeMap[val]
+      end
+
+      def self.from_native(val, ctx)
+        @from_native_called = true
+        FromNativeMap[val]
+      end
+    end
+
+    size = ObjectSpace.memsize_of(FFI::Type::Mapped.new(converter))
+    expect(size).to be > base_size
+    base_size = size
+
+    # Builtin types are larger as they also have a name and own ffi_type
+    size = ObjectSpace.memsize_of(FFI::Type::Builtin::CHAR)
+    expect(size).to be > base_size
+  end
+end