1 files changed, 18 insertions, 0 deletions
diff --git a/spec/bundler/bundler/plugin/events_spec.rb b/spec/bundler/bundler/plugin/events_spec.rb
new file mode 100644
index 0000000000..b09e915682
--- /dev/null
+++ b/spec/bundler/bundler/plugin/events_spec.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+RSpec.describe Bundler::Plugin::Events do
+  context "plugin events" do
+    describe "#define" do
+      it "raises when redefining a constant" do
+        expect do
+          Bundler::Plugin::Events.send(:define, :GEM_BEFORE_INSTALL_ALL, "another-value")
+        end.to raise_error(ArgumentError)
+      end
+
+      it "can define a new constant" do
+        Bundler::Plugin::Events.send(:define, :NEW_CONSTANT, "value")
+        expect(Bundler::Plugin::Events::NEW_CONSTANT).to eq("value")
+      end
+    end
+  end
+end