Add tests for dev-utils package

packages/dev-utils/test/blockchain_lifecycle_test.ts

@@ -0,0 +1,25 @@
+import { BlockParamLiteral } from '@0xproject/types';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as chai from 'chai';
+import 'mocha';
+
+import { BlockchainLifecycle, RPC, web3Factory } from '../src';
+
+const expect = chai.expect;
+
+describe('BlockchainLifecycle tests', () => {
+    const web3 = web3Factory.create();
+    const web3Wrapper = new Web3Wrapper(web3.currentProvider);
+    const rpc = new RPC();
+    const blockchainLifecycle = new BlockchainLifecycle();
+    describe('#startAsync/revertAsync', () => {
+        it('reverts changes in between', async () => {
+            const blockNumberBefore = await web3Wrapper.getBlockNumberAsync();
+            await blockchainLifecycle.startAsync();
+            await rpc.mineBlockAsync();
+            await blockchainLifecycle.revertAsync();
+            const blockNumberAfter = await web3Wrapper.getBlockNumberAsync();
+            expect(blockNumberAfter).to.be.equal(blockNumberBefore);
+        });
+    });
+});