[wip] spec for clearing tokens

But the test session isn't active!

[skip ci]

engines/dfc_provider/spec/services/dfc_request_spec.rb

@@ -88,5 +88,33 @@ RSpec.describe DfcRequest do
       products = graph.select { |s| s.semanticType == "dfc-b:SuppliedProduct" }
       expect(products).to be_present
     end
+
+    context "with account tokens" do
+      before do
+        account.refresh_token = ENV.fetch("OPENID_REFRESH_TOKEN")
+        api.call(
+          "https://env-0105831.jcloud-ver-jpe.ik-server.com/api/dfc/Enterprises/test-hodmedod/SuppliedProducts"
+        )
+        expect(account.token).not_to be_nil
+      end
+
+      it "clears the token if authentication fails", vcr: true do
+        allow_any_instance_of(OpenIDConnect::Client).to receive(:access_token!).and_raise(
+          Rack::OAuth2::Client::Error.new(
+            1, { error: "invalid_grant", error_description: "session not active" }
+          )
+        )
+
+        expect {
+          api.call(
+            "https://env-0105831.jcloud-ver-jpe.ik-server.com/api/dfc/Enterprises/test-hodmedod/SuppliedProducts"
+          )
+        }.to raise_error(Rack::OAuth2::Client::Error).and change {
+          account.token
+        }.to(nil).and change {
+          account.refresh_token
+        }.to(nil)
+      end
+    end
   end
 end