add buidler coverage

buidler.config.js

@@ -1,4 +1,6 @@
 require('chai/register-should');
+usePlugin('solidity-coverage'); // eslint-disable-line no-undef
+usePlugin('@nomiclabs/buidler-ganache'); // eslint-disable-line no-undef
 usePlugin('@nomiclabs/buidler-truffle5'); // eslint-disable-line no-undef
 
 module.exports = {
@@ -7,6 +9,11 @@ module.exports = {
     buidlerevm: {
       hardfork: 'istanbul',
     },
+    coverage: {
+      url: 'http://127.0.0.1:8555',
+      gas: 0xfffffffffff,
+      gasPrice: 0x01,
+    },
   },
   solc: {
     version: '0.5.16',

package.json

@@ -13,7 +13,10 @@
     "test": "npm run compile && scripts/test.sh",
     "buidler:compile": "buidler compile",
     "buidler:console": "buidler console",
+    "buidler:coverage": "npm run buidler:compile && USE_BUIDLER=true scripts/coverage.sh",
     "buidler:test": "buidler test",
+    "clean": "rm -rf coverage",
+    "profile": "npm run clean && npm run coverage && open coverage/index.html",
     "lint": "npm run lint:js && npm run lint:sol",
     "lint:fix": "npm run lint:js:fix",
     "lint:js": "eslint .",
@@ -46,25 +49,26 @@
   },
   "devDependencies": {
     "@nomiclabs/buidler": "^1.0.2",
+    "@nomiclabs/buidler-ganache": "^1.0.2",
     "@nomiclabs/buidler-truffle5": "^1.0.2",
     "@nomiclabs/buidler-web3": "^1.0.2",
     "@openzeppelin/test-helpers": "^0.5.4",
     "chai": "^4.2.0",
     "coveralls": "^3.0.9",
     "eslint": "^6.8.0",
     "eslint-config-standard": "^14.1.0",
-    "eslint-plugin-import": "^2.19.1",
+    "eslint-plugin-import": "^2.20.0",
     "eslint-plugin-mocha-no-only": "^1.1.0",
     "eslint-plugin-node": "^11.0.0",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
     "ethereumjs-util": "^6.2.0",
     "ethjs-abi": "^0.2.1",
-    "ganache-cli": "^6.8.0-istanbul.0",
+    "ganache-cli": "^6.8.2",
     "pify": "^4.0.1",
     "solhint": "^2.3.0",
-    "solidity-coverage": "^0.7.0",
-    "truffle": "^5.1.6",
+    "solidity-coverage": "^0.7.1",
+    "truffle": "^5.1.9",
     "vuepress": "^0.14.11",
     "web3": "^1.2.4"
   }

scripts/coverage.sh

@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
-npx truffle run coverage --network coverage
+if [ "$USE_BUIDLER" = true ]; then
+  npx buidler coverage --network coverage
+else
+  npx truffle run coverage --network coverage
+fi
 
 cat coverage/lcov.info | coveralls