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Installation¶
To get started, install ethereum-waffle:
Add external dependency¶
Add an external library by installing it with yarn or npm:
Writing a contract¶
Below is an example contract written in Solidity. Place it in src/BasicToken.sol file of your project:
Compiling the contract¶
Add the following entry in the package.json of your project :
Note
Since Waffle 3.0.0 it recognises waffle.json as default configuration file. If your configuration file is calledwaffle.json, it’s possible to use just waffle to build contracts.
In the waffle.json file of your project add the following entry:
Then run the following command:
You should see that Waffle compiled your contract and placed the resulting JSONoutput inside the build directory.
If you want to know more about how to configure Waffle, see Configuration.
Flattener¶
To flat your smart contracts run:
In configuration file you can add optional field with path to flatten files:
Writing tests¶
After you have successfully authored a Smart Contract you can now think abouttesting it. Fortunately for you, Waffle is packed with tools that help with that.
Tests in waffle are written using Mocha alongside withChai. You can use a different test environment,but Waffle matchers only work with chai.
Run:
Waffle Tower Defense (vgdc) Mac Os X
Note
If you are using Typescript don’t forget to add ts-node and typescript to your devDependencies. Also, make sure to add a tsconfig.json, and within it, set 'esModuleInterop' and 'resolveJsonModule' to true. Lastly, instead of using mocha in your Node scripts within your package.json, replace it with ts-node.
Below is an example test file for the contract above written with Waffle. Place it under test/BasicToken.test.ts file in your project directory:
Running tests¶
Waffle Tower Defense (vgdc) Mac Os Update
Update your package.json file to include:
If you are using TypeScript add mocha.opts file in your test folder:
And run:
You should see the following output:
If you want to know more about testing with Waffle, see Basic testing.