1 files changed, 22 insertions, 0 deletions
diff --git a/test/optparse/test_did_you_mean.rb b/test/optparse/test_did_you_mean.rb
new file mode 100644
index 0000000000..4d8e272e6b
--- /dev/null
+++ b/test/optparse/test_did_you_mean.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: false
+require_relative 'test_optparse'
+require "did_you_mean" rescue return
+
+class TestOptionParser::DidYouMean < TestOptionParser
+  def setup
+    super
+    @opt.def_option("--foo", Integer) { |v| @foo = v }
+    @opt.def_option("--bar", Integer) { |v| @bar = v }
+    @opt.def_option("--baz", Integer) { |v| @baz = v }
+  end
+
+  def test_did_you_mean
+    assert_raise(OptionParser::InvalidOption) do
+      begin
+        @opt.permute!(%w"--baa")
+      ensure
+        assert_equal("invalid option: --baa\nDid you mean?  baz\n               bar", $!.message)
+      end
+    end
+  end
+end