1 files changed, 17 insertions, 0 deletions
diff --git a/test/mkmf/test_have_var.rb b/test/mkmf/test_have_var.rb
new file mode 100644
index 0000000000..5367ec2248
--- /dev/null
+++ b/test/mkmf/test_have_var.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: false
+require_relative 'base'
+require 'tempfile'
+
+class TestMkmf
+  class TestHaveVar < TestMkmf
+    def test_have_var
+      assert_equal(true, have_var("ruby_version"), MKMFLOG)
+      assert_include($defs, '-DHAVE_RUBY_VERSION')
+    end
+
+    def test_not_have_var
+      assert_equal(false, have_var("rb_vm_something_flag"), MKMFLOG)
+      assert_not_include($defs, '-DHAVE_RB_VM_SOMETHING_FLAG')
+    end
+  end
+end