Fixed issue when chain binaries and account prefixes weren't of same …

…length and added test between Gaia6 and Gaia7

.github/workflows/integration.yaml

@@ -76,6 +76,9 @@ jobs:
           - package: .#gaia8 .#evmos
             command: gaiad,evmosd
             account_prefix: cosmos,evmos
+          - package: .#gaia6 .#gaia7
+            command: $(nix shell .#gaia6 -c which gaiad),$(nix shell .#gaia7 -c which gaiad)
+            account_prefix: cosmos
 
     steps:
       - uses: actions/checkout@v2

tools/test-framework/src/chain/builder.rs

@@ -95,6 +95,7 @@ impl ChainBuilder {
         // If there are more spawned chains than given chain binaries, take the N-th position modulo
         // the number of chain binaries given.
         let chain_number = chain_number % self.command_paths.len();
+        let account_number = chain_number % self.account_prefixes.len();
 
         let chain_type = ChainType::from_str(&self.command_paths[chain_number])?;
 
@@ -112,7 +113,7 @@ impl ChainBuilder {
             self.command_paths[chain_number].clone(),
             chain_id,
             home_path,
-            self.account_prefixes[chain_number].clone(),
+            self.account_prefixes[account_number].clone(),
             rpc_port,
             grpc_port,
             grpc_web_port,