1 files changed, 33 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/object/instance_variables_test.rb b/activesupport/test/core_ext/object/instance_variables_test.rb
new file mode 100644
index 0000000000..9052d209a3
--- /dev/null
+++ b/activesupport/test/core_ext/object/instance_variables_test.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "active_support/core_ext/object"
+
+class ObjectInstanceVariableTest < ActiveSupport::TestCase
+  def setup
+    @source, @dest = Object.new, Object.new
+    @source.instance_variable_set(:@bar, "bar")
+    @source.instance_variable_set(:@baz, "baz")
+  end
+
+  def test_instance_variable_names
+    assert_equal %w(@bar @baz), @source.instance_variable_names.sort
+  end
+
+  def test_instance_values
+    assert_equal({ "bar" => "bar", "baz" => "baz" }, @source.instance_values)
+  end
+
+  def test_instance_exec_passes_arguments_to_block
+    assert_equal %w(hello goodbye), (+"hello").instance_exec("goodbye") { |v| [self, v] }
+  end
+
+  def test_instance_exec_with_frozen_obj
+    assert_equal %w(olleh goodbye), "hello".instance_exec("goodbye") { |v| [reverse, v] }
+  end
+
+  def test_instance_exec_nested
+    assert_equal %w(goodbye olleh bar), (+"hello").instance_exec("goodbye") { |arg|
+      [arg] + instance_exec("bar") { |v| [reverse, v] } }
+  end
+end