Merge branch 'master' of github.com:0xProject/0x.js

# Conflicts:
#	src/ts/0x.js.ts
#	src/ts/utils/utils.ts

1 files changed, 20 insertions, 0 deletions

diff --git a/test/utils/blockchain_lifecycle.ts b/test/utils/blockchain_lifecycle.ts
new file mode 100644
index 000000000..68e169ac0
--- /dev/null
+++ b/test/utils/blockchain_lifecycle.ts
@@ -0,0 +1,20 @@
+import {RPC} from './rpc';
+
+export class BlockchainLifecycle {
+    private rpc: RPC;
+    private snapshotId: number;
+    constructor() {
+        this.rpc = new RPC();
+    }
+    // TODO: In order to run these tests on an actual node, we should check if we are running against
+    // TestRPC, if so, use snapshots, otherwise re-deploy contracts before every test
+    public async startAsync(): Promise<void> {
+        this.snapshotId = await this.rpc.takeSnapshotAsync();
+    }
+    public async revertAsync(): Promise<void> {
+        const didRevert = await this.rpc.revertSnapshotAsync(this.snapshotId);
+        if (!didRevert) {
+            throw new Error(`Snapshot with id #${this.snapshotId} failed to revert`);
+        }
+    }
+};