add rpc module to gossamer start-up

Author: edwardmack

tests/polkadotjs_test/package.json

@@ -9,7 +9,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@polkadot/api": "^3.11.1"
+    "@polkadot/api": "2.8.1"
   },
   "devDependencies": {
     "chai": "^4.2.0",

tests/polkadotjs_test/start_polkadotjs_test.go

@@ -17,13 +17,12 @@ package polkadotjs_test
 
 import (
 	"fmt"
+	"github.com/ChainSafe/gossamer/tests/utils"
+	"github.com/stretchr/testify/require"
 	"os"
 	"os/exec"
 	"strings"
 	"testing"
-
-	"github.com/ChainSafe/gossamer/tests/utils"
-	"github.com/stretchr/testify/require"
 )
 
 var polkadotSuite = "polkadot"
@@ -44,7 +43,7 @@ func TestStartGossamerAndPolkadotAPI(t *testing.T) {
 	command := "npx mocha ./test"
 	parts := strings.Fields(command)
 	data, err := exec.Command(parts[0], parts[1:]...).Output()
-	require.NoError(t, err, data)
+	require.NoError(t, err, fmt.Sprintf("%s", data))
 
 	//uncomment this to see log results from javascript tests
 	//fmt.Printf("%s\n", data)

tests/polkadotjs_test/test/test-polkadot.js

@@ -147,4 +147,4 @@ describe('Testing polkadot.js/api calls:', function () {
         });
     });
 
-});
+});