@0x/utils: fix wrong RPC method in getChainIdAsync()

contracts/test-utils/src/constants.ts

@@ -32,6 +32,7 @@ export const constants = {
     BASE_16: 16,
     INVALID_OPCODE: 'invalid opcode',
     TESTRPC_NETWORK_ID: 50,
+    TESTRPC_CHAIN_ID: 1337,
     // Note(albrow): In practice V8 and most other engines limit the minimum
     // interval for setInterval to 10ms. We still set it to 0 here in order to
     // ensure we always use the minimum interval.

contracts/test-utils/test/mocha_blockchain.ts

@@ -18,7 +18,7 @@ blockchainTests('mocha blockchain extensions', env => {
         });
 
         it('initializes the test environment', async () => {
-            expect(await env.getChainIdAsync()).to.eq(constants.TESTRPC_NETWORK_ID);
+            expect(await env.getChainIdAsync()).to.eq(constants.TESTRPC_CHAIN_ID);
             expect(await env.getAccountAddressesAsync()).to.be.not.empty('');
         });
 

packages/utils/src/provider_utils.ts

@@ -111,15 +111,15 @@ export const providerUtils = {
                 {
                     jsonrpc: '2.0',
                     id: _.random(1, RPC_ID_MAX),
-                    method: 'net_version',
+                    method: 'eth_chainId',
                     params: [],
                 },
                 (err: Error | null, result?: JSONRPCResponsePayload) => {
                     if (!_.isNil(err)) {
                         reject(err);
                     }
                     if (!result) {
-                        throw new Error("Invalid 'net_version' response");
+                        throw new Error("Invalid 'eth_chainId' response");
                     }
                     accept(_.toNumber(result.result));
                 },