Add fake gas estimate suprovider for tests

4 files changed, 62 insertions, 1 deletions

diff --git a/packages/0x.js/test/utils/constants.ts b/packages/0x.js/test/utils/constants.ts
index 212abf4d6..75fdf49c9 100644
--- a/packages/0x.js/test/utils/constants.ts
+++ b/packages/0x.js/test/utils/constants.ts
@@ -8,4 +8,5 @@ export const constants = {
     KOVAN_RPC_URL: 'https://kovan.infura.io',
     ROPSTEN_RPC_URL: 'https://ropsten.infura.io',
     ZRX_DECIMALS: 18,
+    GAS_ESTIMATE: 500000,
 };
diff --git a/packages/0x.js/test/utils/subproviders/empty_wallet_subprovider.ts b/packages/0x.js/test/utils/subproviders/empty_wallet_subprovider.ts
new file mode 100644
index 000000000..bc11e56d8
--- /dev/null
+++ b/packages/0x.js/test/utils/subproviders/empty_wallet_subprovider.ts
@@ -0,0 +1,27 @@
+import {JSONRPCPayload} from '../../../src/types';
+
+/*
+ * This class implements the web3-provider-engine subprovider interface and returns
+ * that the provider has no addresses when queried.
+ * Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
+ */
+export class EmptyWalletSubProvider {
+    // This method needs to be here to satisfy the interface but linter wants it to be static.
+    // tslint:disable-next-line:prefer-function-over-method
+    public handleRequest(payload: JSONRPCPayload, next: () => void, end: (err: Error|null, result: any) => void) {
+        switch (payload.method) {
+            case 'eth_accounts':
+                end(null, []);
+                return;
+
+            default:
+                next();
+                return;
+        }
+    }
+    // Required to implement this method despite not needing it for this subprovider
+    // tslint:disable-next-line:prefer-function-over-method
+    public setEngine(engine: any) {
+        // noop
+    }
+}
diff --git a/packages/0x.js/test/utils/subproviders/fake_gas_estimate_subprovider.ts b/packages/0x.js/test/utils/subproviders/fake_gas_estimate_subprovider.ts
new file mode 100644
index 000000000..5eccb3d24
--- /dev/null
+++ b/packages/0x.js/test/utils/subproviders/fake_gas_estimate_subprovider.ts
@@ -0,0 +1,31 @@
+import {JSONRPCPayload} from '../../../src/types';
+
+/*
+ * This class implements the web3-provider-engine subprovider interface and returns
+ * the constant gas estimate when queried.
+ * Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
+ */
+export class FakeGasEstimateProvider {
+    private constantGasAmount: number;
+    constructor(constantGasAmount: number) {
+        this.constantGasAmount = constantGasAmount;
+    }
+    // This method needs to be here to satisfy the interface but linter wants it to be static.
+    // tslint:disable-next-line:prefer-function-over-method
+    public handleRequest(payload: JSONRPCPayload, next: () => void, end: (err: Error|null, result: any) => void) {
+        switch (payload.method) {
+            case 'eth_estimateGas':
+                end(null, this.constantGasAmount);
+                return;
+
+            default:
+                next();
+                return;
+        }
+    }
+    // Required to implement this method despite not needing it for this subprovider
+    // tslint:disable-next-line:prefer-function-over-method
+    public setEngine(engine: any) {
+        // noop
+    }
+}
diff --git a/packages/0x.js/test/utils/web3_factory.ts b/packages/0x.js/test/utils/web3_factory.ts
index b4bf1acd3..854c6091d 100644
--- a/packages/0x.js/test/utils/web3_factory.ts
+++ b/packages/0x.js/test/utils/web3_factory.ts
@@ -7,7 +7,8 @@ import * as Web3 from 'web3';
 import ProviderEngine = require('web3-provider-engine');
 import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
 
-import {EmptyWalletSubProvider} from '../../src/subproviders/empty_wallet_subprovider';
+import {EmptyWalletSubProvider} from './subproviders/empty_wallet_subprovider';
+import {FakeGasEstimateProvider} from './subproviders/fake_gas_estimate_subprovider';
 
 import {constants} from './constants';
 
@@ -24,6 +25,7 @@ export const web3Factory = {
         if (!hasAddresses) {
             provider.addProvider(new EmptyWalletSubProvider());
         }
+        provider.addProvider(new FakeGasEstimateProvider(constants.GAS_ESTIMATE));
         provider.addProvider(new RpcSubprovider({
             rpcUrl,
         }));