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# Contracts testing options
## Revert stack traces
If you want to see helpful stack traces (incl. line number, code snippet) for smart contract reverts, run the tests with:
```
yarn test:trace
```
**Note:** This currently slows down the test runs and is therefore not enabled by default.
## Backing Ethereum node
By default, our tests run against an in-process [Ganache](https://github.com/trufflesuite/ganache-core) instance. In order to run the tests against [Geth](https://github.com/ethereum/go-ethereum), first follow the instructions in the README for the devnet package to start the devnet Geth node. Then run:
```bash
TEST_PROVIDER=geth yarn test
```
## Code coverage
In order to see the Solidity code coverage output generated by `@0x/sol-cov`, run:
```
yarn test:coverage
```
## Gas profiler
In order to profile the gas costs for a specific smart contract call/transaction, you can run the tests in `profiler` mode.
**Note:** Traces emitted by ganache have incorrect gas costs so we recommend using Geth for profiling.
```
TEST_PROVIDER=geth yarn test:profiler
```
You'll see a warning that you need to explicitly enable and disable the profiler before and after the block of code you want to profile.
```typescript
import { profiler } from './utils/profiler';
profiler.start();
// Some call to a smart contract
profiler.stop();
```
Without explicitly starting and stopping the profiler, the profiler output will be too busy, and therefore unusable.
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