1 files changed, 25 insertions, 0 deletions
diff --git a/spec/bundler/other/compatibility_guard_spec.rb b/spec/bundler/other/compatibility_guard_spec.rb
new file mode 100644
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+++ b/spec/bundler/other/compatibility_guard_spec.rb
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+# frozen_string_literal: true
+
+RSpec.describe "bundler compatibility guard" do
+  context "when the bundler version is 2+" do
+    before { simulate_bundler_version "2.0.a" }
+
+    context "when running on Ruby < 2.3", :ruby => "< 2.3" do
+      before { simulate_rubygems_version "2.6.11" }
+
+      it "raises a friendly error" do
+        bundle :version
+        expect(err).to eq("Bundler 2 requires Ruby 2.3 or later. Either install bundler 1 or update to a supported Ruby version.")
+      end
+    end
+
+    context "when running on RubyGems < 2.5", :ruby => ">= 2.5" do
+      before { simulate_rubygems_version "1.3.6" }
+
+      it "raises a friendly error" do
+        bundle :version
+        expect(err).to eq("Bundler 2 requires RubyGems 2.5 or later. Either install bundler 1 or update to a supported RubyGems version.")
+      end
+    end
+  end
+end