3 files changed, 62 insertions, 10 deletions
diff --git a/packages/dev-utils/CHANGELOG.json b/packages/dev-utils/CHANGELOG.json
index ecb43a42e..4e1647cd8 100644
--- a/packages/dev-utils/CHANGELOG.json
+++ b/packages/dev-utils/CHANGELOG.json
@@ -1,5 +1,14 @@
 [
     {
+        "version": "0.4.3",
+        "changes": [
+            {
+                "note": "Add optional parameter shouldUseFakeGasEstimate to Web3Config",
+                "pr": 622
+            }
+        ]
+    },
+    {
         "version": "0.4.2",
         "changes": [
             {
diff --git a/packages/dev-utils/src/blockchain_lifecycle.ts b/packages/dev-utils/src/blockchain_lifecycle.ts
index cb448243a..b9688237d 100644
--- a/packages/dev-utils/src/blockchain_lifecycle.ts
+++ b/packages/dev-utils/src/blockchain_lifecycle.ts
@@ -1,4 +1,11 @@
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { uniqueVersionIds, Web3Wrapper } from '@0xproject/web3-wrapper';
+import { includes } from 'lodash';
+import * as Web3 from 'web3';
+
+enum NodeType {
+    Geth = 'GETH',
+    Ganache = 'GANACHE',
+}
 
 export class BlockchainLifecycle {
     private _web3Wrapper: Web3Wrapper;
@@ -7,17 +14,47 @@ export class BlockchainLifecycle {
         this._web3Wrapper = web3Wrapper;
         this._snapshotIdsStack = [];
     }
-    // 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> {
-        const snapshotId = await this._web3Wrapper.takeSnapshotAsync();
-        this._snapshotIdsStack.push(snapshotId);
+        const nodeType = await this._getNodeTypeAsync();
+        switch (nodeType) {
+            case NodeType.Ganache:
+                const snapshotId = await this._web3Wrapper.takeSnapshotAsync();
+                this._snapshotIdsStack.push(snapshotId);
+                break;
+            case NodeType.Geth:
+                const blockNumber = await this._web3Wrapper.getBlockNumberAsync();
+                this._snapshotIdsStack.push(blockNumber);
+                break;
+            default:
+                throw new Error(`Unknown node type: ${nodeType}`);
+        }
     }
     public async revertAsync(): Promise<void> {
-        const snapshotId = this._snapshotIdsStack.pop() as number;
-        const didRevert = await this._web3Wrapper.revertSnapshotAsync(snapshotId);
-        if (!didRevert) {
-            throw new Error(`Snapshot with id #${snapshotId} failed to revert`);
+        const nodeType = await this._getNodeTypeAsync();
+        switch (nodeType) {
+            case NodeType.Ganache:
+                const snapshotId = this._snapshotIdsStack.pop() as number;
+                const didRevert = await this._web3Wrapper.revertSnapshotAsync(snapshotId);
+                if (!didRevert) {
+                    throw new Error(`Snapshot with id #${snapshotId} failed to revert`);
+                }
+                break;
+            case NodeType.Geth:
+                const blockNumber = this._snapshotIdsStack.pop() as number;
+                await this._web3Wrapper.setHeadAsync(blockNumber);
+                break;
+            default:
+                throw new Error(`Unknown node type: ${nodeType}`);
+        }
+    }
+    private async _getNodeTypeAsync(): Promise<NodeType> {
+        const version = await this._web3Wrapper.getNodeVersionAsync();
+        if (includes(version, uniqueVersionIds.geth)) {
+            return NodeType.Geth;
+        } else if (includes(version, uniqueVersionIds.ganache)) {
+            return NodeType.Ganache;
+        } else {
+            throw new Error(`Unknown client version: ${version}`);
         }
     }
 }
diff --git a/packages/dev-utils/src/web3_factory.ts b/packages/dev-utils/src/web3_factory.ts
index 4e30007a7..47eef4cbd 100644
--- a/packages/dev-utils/src/web3_factory.ts
+++ b/packages/dev-utils/src/web3_factory.ts
@@ -17,16 +17,22 @@ export interface Web3Config {
     hasAddresses?: boolean; // default: true
     shouldUseInProcessGanache?: boolean; // default: false
     rpcUrl?: string; // default: localhost:8545
+    shouldUseFakeGasEstimate?: boolean; // default: true
 }
 
 export const web3Factory = {
     getRpcProvider(config: Web3Config = {}): ProviderEngine {
         const provider = new ProviderEngine();
         const hasAddresses = _.isUndefined(config.hasAddresses) || config.hasAddresses;
+        config.shouldUseFakeGasEstimate =
+            _.isUndefined(config.shouldUseFakeGasEstimate) || config.shouldUseFakeGasEstimate;
         if (!hasAddresses) {
             provider.addProvider(new EmptyWalletSubprovider());
         }
-        provider.addProvider(new FakeGasEstimateSubprovider(constants.GAS_LIMIT));
+
+        if (config.shouldUseFakeGasEstimate) {
+            provider.addProvider(new FakeGasEstimateSubprovider(constants.GAS_LIMIT));
+        }
         const logger = {
             log: (arg: any) => {
                 fs.appendFileSync('ganache.log', `${arg}\n`);