test: add tests for CRL urls redirecting to other url

spec/client_spec.rb

@@ -156,5 +156,20 @@
         expect { subject }.to raise_error(described_class::UnverifiedSigningKeyError, error)
       end
     end
+
+    context "when a CRL url redirects to another url" do
+      let(:redirecting_url) do
+        { status: 302, headers: { location: "http://crl.globalsign.com/gs/redirected.crl" } }
+      end
+
+      before(:each) do
+        stub_request(:get, "http://crl.globalsign.com/gs/gsextendvalsha2g3r3.crl").to_return(redirecting_url)
+        stub_request(:get, "http://crl.globalsign.com/gs/redirected.crl").to_return(extendval_crl)
+      end
+
+      specify do
+        expect(subject).to include("nextUpdate", "entries", "no")
+      end
+    end
   end
 end