Add a regression test to make sure voting strategies are unique

test/starknet/Space.test.ts

@@ -4,6 +4,7 @@ import { StarknetContract, Account } from 'hardhat/types';
 import { utils } from '@snapshot-labs/sx';
 import { vanillaSetup } from '../shared/setup';
 import { PROPOSE_SELECTOR, VOTE_SELECTOR } from '../shared/constants';
+import { getProposeCalldata } from '@snapshot-labs/sx/dist/utils/encoding';
 
 describe('Space Testing', () => {
   // Contracts
@@ -118,6 +119,35 @@ describe('Space Testing', () => {
     }
   }).timeout(6000000);
 
+  it('Fails if the same voting strategy is used multiple times', async () => {
+    // -- Creates the proposal --
+    {
+      const duplicateVotingStrategies = [
+        vanillaVotingStrategy.address,
+        vanillaAuthenticator.address,
+        vanillaVotingStrategy.address,
+      ];
+      const duplicateCalldata = utils.encoding.getProposeCalldata(
+        proposerEthAddress,
+        metadataUri,
+        executionStrategy,
+        duplicateVotingStrategies,
+        userVotingParamsAll1,
+        executionParams
+      );
+
+      try {
+        await vanillaAuthenticator.invoke('authenticate', {
+          target: spaceAddress,
+          function_selector: PROPOSE_SELECTOR,
+          calldata: duplicateCalldata,
+        });
+      } catch (error: any) {
+        expect(error.message).to.contain('Duplicate entry found');
+      }
+    }
+  }).timeout(6000000);
+
   it('Reverts when querying an invalid proposal id', async () => {
     try {
       await space.call('get_proposal_info', {