1 files changed, 20 insertions, 0 deletions
diff --git a/spec/initializers/00_deprecations_spec.rb b/spec/initializers/00_deprecations_spec.rb
new file mode 100644
index 00000000000..e52e64415af
--- /dev/null
+++ b/spec/initializers/00_deprecations_spec.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe '00_deprecations' do
+  where(:warning) do
+    [
+      "ActiveModel::Errors#keys is deprecated and will be removed in Rails 6.2",
+      "Rendering actions with '.' in the name is deprecated:",
+      "default_hash is deprecated and will be removed from Rails 6.2"
+    ]
+  end
+
+  with_them do
+    specify do
+      expect { ActiveSupport::Deprecation.warn(warning) }
+        .to raise_error(ActiveSupport::DeprecationException)
+    end
+  end
+end