1 files changed, 39 insertions, 0 deletions
diff --git a/mrbgems/mruby-struct/test/struct.rb b/mrbgems/mruby-struct/test/struct.rb
index 02ecf69e4..1c0939e7f 100644
--- a/mrbgems/mruby-struct/test/struct.rb
+++ b/mrbgems/mruby-struct/test/struct.rb
@@ -158,3 +158,42 @@ assert("Struct#dig") do
   assert_equal 1, a.dig(:purple, :red)
   assert_equal 1, a.dig(1, 0)
 end
+
+assert("Struct.new removes existing constant") do
+  skip "redefining Struct with same name cause warnings"
+  begin
+    assert_not_equal Struct.new("Test", :a), Struct.new("Test", :a, :b)
+  ensure
+    Struct.remove_const :Test
+  end
+end
+
+assert("Struct#initialize_copy requires struct to be the same type") do
+  begin
+    Struct.new("Test", :a)
+    a = Struct::Test.new("a")
+    Struct.remove_const :Test
+    Struct.new("Test", :a, :b)
+    assert_raise(TypeError) do
+      a.initialize_copy(Struct::Test.new("a", "b"))
+    end
+  ensure
+    Struct.remove_const :Test
+  end
+end
+
+assert("Struct.new does not allow array") do
+  assert_raise(TypeError) do
+    Struct.new("Test", [:a])
+  end
+end
+
+assert("Struct.new generates subclass of Struct") do
+  begin
+    original_struct = Struct
+    Struct = String
+    assert_equal original_struct, original_struct.new.superclass
+  ensure
+    Struct = original_struct
+  end
+end