3 files changed, 29 insertions, 0 deletions
diff --git a/ext/-test-/econv/append.c b/ext/-test-/econv/append.c
new file mode 100644
index 0000000000..724cd136c0
--- /dev/null
+++ b/ext/-test-/econv/append.c
@@ -0,0 +1,15 @@
+#include "ruby/ruby.h"
+#include "ruby/encoding.h"
+
+static VALUE
+econv_append(VALUE self, VALUE src, VALUE dst)
+{
+    rb_econv_t *ec = DATA_PTR(self);
+    return rb_econv_str_append(ec, src, dst, 0);
+}
+
+void
+Init_econv_append(VALUE klass)
+{
+    rb_define_method(klass, "append", econv_append, 2);
+}
diff --git a/ext/-test-/econv/extconf.rb b/ext/-test-/econv/extconf.rb
new file mode 100644
index 0000000000..d786b15db9
--- /dev/null
+++ b/ext/-test-/econv/extconf.rb
@@ -0,0 +1,3 @@
+# frozen_string_literal: false
+require_relative "../auto_ext.rb"
+auto_ext(inc: true)
diff --git a/ext/-test-/econv/init.c b/ext/-test-/econv/init.c
new file mode 100644
index 0000000000..9772ebe71c
--- /dev/null
+++ b/ext/-test-/econv/init.c
@@ -0,0 +1,11 @@
+#include "ruby.h"
+
+#define init(n) {void Init_econv_##n(VALUE klass); Init_econv_##n(klass);}
+
+void
+Init_econv(void)
+{
+    VALUE mBug = rb_define_module("Bug");
+    VALUE klass = rb_define_class_under(mBug, "EConv", rb_path2class("Encoding::Converter"));
+    TEST_INIT_FUNCS(init);
+}