1 files changed, 12 insertions, 0 deletions
diff --git a/test/erb/test_erb_command.rb b/test/erb/test_erb_command.rb
index 7e2b874632..ac87b07740 100644
--- a/test/erb/test_erb_command.rb
+++ b/test/erb/test_erb_command.rb
@@ -15,4 +15,16 @@ class TestErbCommand < Test::Unit::TestCase
                        File.expand_path("../../../bin/erb", __FILE__)],
                       "<%=''.encoding.to_s%>", ["UTF-8"])
   end
+
+  # These interfaces will be removed at Ruby 2.7.
+  def test_deprecated_option
+    warnings = [
+      "warning: -S option of erb command is deprecated. Please do not use this.",
+      "warning: Passing safe_level with the 2nd argument of ERB.new is deprecated. Do not use it, and specify other arguments as keyword arguments.",
+    ]
+    assert_in_out_err(["-w",
+                       File.expand_path("../../../bin/erb", __FILE__),
+                       "-S", "0"],
+                      "hoge", ["hoge"], warnings)
+  end
 end