Add missing onPreCompile stage hook

plugins/hardhat.plugin.js

@@ -196,6 +196,8 @@ task("coverage", "Generates a code coverage report for tests")
       config.paths.cache = nomiclabsUtils.tempCacheDir(config);
     }
 
+    await api.onPreCompile(config);
+
     await env.run(TASK_COMPILE);
 
     await api.onCompileComplete(config);

test/integration/standard.js

@@ -223,7 +223,7 @@ describe('Hardhat Plugin: standard use cases', function() {
   });
 
   it('config: "onServerReady", "onTestsComplete", ...', async function() {
-    mock.installFullProject('test-files');
+    mock.installFullProject('task-hooks');
 
     mock.hardhatSetupEnv(this);
 
@@ -232,6 +232,7 @@ describe('Hardhat Plugin: standard use cases', function() {
     assert(
       mock.loggerOutput.val.includes('running onServerReady')     &&
       mock.loggerOutput.val.includes('running onTestsComplete')   &&
+      mock.loggerOutput.val.includes('running onPreCompile') &&
       mock.loggerOutput.val.includes('running onCompileComplete') &&
       mock.loggerOutput.val.includes('running onIstanbulComplete'),
 

test/sources/projects/task-hooks/.solcover.js

@@ -0,0 +1,13 @@
+// Testing hooks
+const fn = (msg, config) => config.logger.log(msg);
+
+module.exports = {
+  skipFiles: [],
+  silent: process.env.SILENT ? true : false,
+  istanbulReporter: ['json-summary', 'text'],
+  onPreCompile: fn.bind(null, 'running onPreCompile'),
+  onServerReady: fn.bind(null, 'running onServerReady'),
+  onTestsComplete: fn.bind(null, 'running onTestsComplete'),
+  onCompileComplete: fn.bind(null, 'running onCompileComplete'),
+  onIstanbulComplete: fn.bind(null, 'running onIstanbulComplete')
+}

test/sources/projects/task-hooks/contracts/Hooks.sol

@@ -0,0 +1,17 @@
+pragma solidity >=0.8.0 <0.9.0;
+
+
+contract ContractA {
+  uint x;
+  constructor() public {
+  }
+
+  function sendFn() public {
+    x = 5;
+  }
+
+  function callFn() public pure returns (uint){
+    uint y = 5;
+    return y;
+  }
+}

test/sources/projects/task-hooks/hardhat.config.js

@@ -0,0 +1,9 @@
+require("@nomiclabs/hardhat-truffle5");
+require(__dirname + "/../plugins/nomiclabs.plugin");
+
+module.exports = {
+  solidity: {
+    version: "0.8.17"
+  },
+  logger: process.env.SILENT ? { log: () => {} } : console,
+};

test/sources/projects/task-hooks/test/hooks.js

@@ -0,0 +1,15 @@
+const ContractA = artifacts.require("ContractA");
+
+contract("contracta", function(accounts) {
+  let instance;
+
+  before(async () => instance = await ContractA.new())
+
+  it('sends', async function(){
+    await instance.sendFn();
+  });
+
+  it('calls', async function(){
+    await instance.callFn();
+  })
+});

test/sources/projects/test-files/.solcover.js

@@ -1,13 +1,5 @@
-// Testing hooks
-const fn = (msg, config) => config.logger.log(msg);
-
 module.exports = {
-  skipFiles: ['Migrations.sol'],
+  skipFiles: [],
   silent: process.env.SILENT ? true : false,
-  istanbulReporter: ['json-summary', 'text'],
-  onPreCompile: fn.bind(null, 'running onPreCompile'),
-  onServerReady: fn.bind(null, 'running onServerReady'),
-  onTestsComplete: fn.bind(null, 'running onTestsComplete'),
-  onCompileComplete: fn.bind(null, 'running onCompileComplete'),
-  onIstanbulComplete: fn.bind(null, 'running onIstanbulComplete')
+  istanbulReporter: ['json-summary', 'text']
 }