1 files changed, 47 insertions, 0 deletions
diff --git a/test/-ext-/test_abi.rb b/test/-ext-/test_abi.rb
new file mode 100644
index 0000000000..d3ea6bb9b1
--- /dev/null
+++ b/test/-ext-/test_abi.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+return unless RUBY_PATCHLEVEL < 0
+
+class TestABI < Test::Unit::TestCase
+  def test_require_lib_with_incorrect_abi_on_dev_ruby
+    omit "ABI is not checked" unless abi_checking_supported?
+
+    assert_separately [], <<~RUBY
+      err = assert_raise(LoadError) { require "-test-/abi" }
+      assert_match(/incompatible ABI version/, err.message)
+      assert_include err.message, "/-test-/abi."
+    RUBY
+  end
+
+  def test_disable_abi_check_using_environment_variable
+    omit "ABI is not checked" unless abi_checking_supported?
+
+    assert_separately [{ "RUBY_ABI_CHECK" => "0" }], <<~RUBY
+      assert_nothing_raised { require "-test-/abi" }
+    RUBY
+  end
+
+  def test_enable_abi_check_using_environment_variable
+    omit "ABI is not checked" unless abi_checking_supported?
+
+    assert_separately [{ "RUBY_ABI_CHECK" => "1" }], <<~RUBY
+      err = assert_raise(LoadError) { require "-test-/abi" }
+      assert_match(/incompatible ABI version/, err.message)
+      assert_include err.message, "/-test-/abi."
+    RUBY
+  end
+
+  def test_require_lib_with_incorrect_abi_on_release_ruby
+    omit "ABI is enforced" if abi_checking_supported?
+
+    assert_separately [], <<~RUBY
+      assert_nothing_raised { require "-test-/abi" }
+    RUBY
+  end
+
+  private
+
+  def abi_checking_supported?
+    !(RUBY_PLATFORM =~ /mswin|mingw/)
+  end
+end