Fix default gas limit for fake txs in TraceCollectionSubprovider

This hex string is required to be prefixed with '0x'. If it does not have that
prefix, then the call to unmarshalTxData below will fail with:

	BigNumber Error: new BigNumber() not a number: 5b8d80

This default value is overridden if the incoming call already has a gas
estimate, in which case the parse error above does not happen. This is probably
why the error wasn't previously noticed.

1 files changed, 1 insertions, 1 deletions

diff --git a/packages/sol-tracing-utils/src/trace_collection_subprovider.ts b/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
index 8279bda54..6f833b0fc 100644
--- a/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
+++ b/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
@@ -186,7 +186,7 @@ export abstract class TraceCollectionSubprovider extends Subprovider {
         const blockchainLifecycle = new BlockchainLifecycle(this._web3Wrapper);
         await blockchainLifecycle.startAsync();
         const fakeTxData = {
-            gas: BLOCK_GAS_LIMIT.toString(16), // tslint:disable-line:custom-no-magic-numbers
+            gas: `0x${BLOCK_GAS_LIMIT.toString(16)}`, // tslint:disable-line:custom-no-magic-numbers
             isFakeTransaction: true, // This transaction (and only it) is allowed to come through when the lock is locked
             ...callData,
             from: callData.from || this._defaultFromAddress,