1 files changed, 110 insertions, 0 deletions
diff --git a/test/ruby/test_inlinecache.rb b/test/ruby/test_inlinecache.rb
new file mode 100644
index 0000000000..d48d95d74e
--- /dev/null
+++ b/test/ruby/test_inlinecache.rb
@@ -0,0 +1,110 @@
+# -*- coding: us-ascii -*-
+# frozen_string_literal: true
+
+require 'test/unit'
+
+class TestMethodInlineCache < Test::Unit::TestCase
+  def test_alias
+    m0 = Module.new do
+      def foo; :M0 end
+    end
+    m1 = Module.new do
+      include m0
+    end
+    c = Class.new do
+      include m1
+      alias bar foo
+    end
+    d = Class.new(c) do
+    end
+
+    test = -> do
+      d.new.bar
+    end
+
+    assert_equal :M0, test[]
+
+    c.class_eval do
+      def bar
+        :C
+      end
+    end
+
+    assert_equal :C, test[]
+  end
+
+  def test_zsuper
+    assert_separately [], <<-EOS
+      class C
+        private def foo
+          :C
+        end
+      end
+
+      class D < C
+        public :foo
+      end
+
+      class E < D; end
+      class F < E; end
+
+      test = -> do
+        F.new().foo
+      end
+
+      assert_equal :C, test[]
+
+      class E
+        def foo; :E; end
+      end
+
+      assert_equal :E, test[]
+    EOS
+  end
+
+  def test_module_methods_redefiniton
+    m0 = Module.new do
+      def foo
+        super
+      end
+    end
+
+    c1 = Class.new do
+      def foo
+        :C1
+      end
+    end
+
+    c2 = Class.new do
+      def foo
+        :C2
+      end
+    end
+
+    d1 = Class.new(c1) do
+      include m0
+    end
+
+    d2 = Class.new(c2) do
+      include m0
+    end
+
+    assert_equal :C1, d1.new.foo
+
+    m = Module.new do
+      def foo
+        super
+      end
+    end
+
+    d1.class_eval do
+      include m
+    end
+
+    d2.class_eval do
+      include m
+    end
+
+    assert_equal :C2, d2.new.foo
+  end
+end