Allow files to be skipped during coverage

README.md

@@ -76,6 +76,7 @@ can be useful if you are using a different vm like the [sc-forks version of pyet
 directory. `dir` allows you to define a relative path from the root directory to those assets.
 `dir: "./<dirname>"` would tell solidity-coverage to look for `./<dirname>/contracts/` and `./<dirname>/test/`
 + **copyNodeModules**: *{ Boolean }* : When true, will copy `node_modules` into the coverage environment. False by default, and may significantly increase the time for coverage to complete if enabled. Only enable if required.
++ **skipFiles**: *{ Array }* : An array of contracts (with paths expressed relative to the `contracts` directory) that should be skipped when doing instrumentation. `Migrations.sol` is skipped by default, and does not need to be added to this configuration option if it is used.
 
 **Example .solcover.js config file**
 ```javascript
@@ -97,7 +98,7 @@ the extra events. If this is the case, then the coverage may be incomplete. To a
 
 **Using `require` in `migrations.js` files**: Truffle overloads Node's `require` function but
 implements a simplified search algorithm for node_modules packages
-([see Truffle issue #383](https://github.com/trufflesuite/truffle/issues/383)). 
+([see Truffle issue #383](https://github.com/trufflesuite/truffle/issues/383)).
 Because solidity-coverage copies an instrumented version of your project into a temporary folder, `require`
 statements handled by Truffle internally won't resolve correctly.  
 

bin/exec.js

@@ -62,6 +62,7 @@ const workingDir = config.dir || '.';       // Relative path to contracts folder
 let port = config.port || 8555;             // Port testrpc listens on
 const accounts = config.accounts || 35;     // Number of accounts to testrpc launches with
 const copyNodeModules = config.copyNodeModules || false; // Whether we copy node_modules when making coverage environment
+let skipFiles = config.skipFiles || []; // Which files should be skipped during instrumentation
 
 // Silence shell and script logging (for solcover's unit tests / CI)
 if (config.silent) {
@@ -89,7 +90,7 @@ try {
   // Coverage network opts specified: use port if declared
   if (truffleConfig && truffleConfig.networks && truffleConfig.networks.coverage) {
     port = truffleConfig.networks.coverage.port || port;
-   
+
   // Coverage network opts NOT specified: default to the development network w/ modified
   // port, gasLimit, gasPrice. Export the config object only.
   } else {
@@ -114,18 +115,19 @@ try {
   cleanUp(msg + err);
 }
 
-// For each contract except migrations.sol:
+// For each contract except migrations.sol (or those in skipFiles):
 // 1. Generate file path reference for coverage report
 // 2. Load contract as string
 // 3. Instrument contract
 // 4. Save instrumented contract in the coverage environment folder where covered tests will run
 // 5. Add instrumentation info to the coverage map
+skipFiles = skipFiles.map(contract => `${coverageDir}/contracts/` + contract);
+skipFiles.push(`${coverageDir}/contracts/Migrations.sol`);
+
 let currentFile;
 try {
   shell.ls(`${coverageDir}/contracts/**/*.sol`).forEach(file => {
-    const migrations = `${coverageDir}/contracts/Migrations.sol`;
-
-    if (file !== migrations) {
+    if (!skipFiles.includes(file)) {
       log('Instrumenting ', file);
       currentFile = file;
 
@@ -135,6 +137,8 @@ try {
       const instrumentedContractInfo = getInstrumentedVersion(contract, canonicalPath);
       fs.writeFileSync(contractPath, instrumentedContractInfo.contract);
       coverage.addContract(instrumentedContractInfo, canonicalPath);
+    } else {
+      log('Skipping instrumentation of ', file);
     }
   });
 } catch (err) {

test/cli.js

@@ -242,6 +242,28 @@ describe('cli', () => {
     collectGarbage();
   });
 
+  it('contracts are skipped: should generate coverage, cleanup & exit(0)', () => {
+    // Skip instrumentation of some contracts
+    assert(pathExists('./coverage') === false, 'should start without: coverage');
+    assert(pathExists('./coverage.json') === false, 'should start without: coverage.json');
+    const testConfig = Object.assign({}, config);
+
+    testConfig.skipFiles = ['Owned.sol'];
+    mock.installInheritanceTest(testConfig);
+
+    shell.exec(script);
+    assert(shell.error() === null, 'script should not error');
+
+    assert(pathExists('./coverage') === true, 'script should gen coverage folder');
+    assert(pathExists('./coverage.json') === true, 'script should gen coverage.json');
+
+    const produced = JSON.parse(fs.readFileSync('./coverage.json', 'utf8'));
+    const firstKey = Object.keys(produced)[0];
+    assert(Object.keys(produced).length === 1, 'coverage.json should only contain instrumentation for one contract');
+    assert(firstKey.substr(firstKey.length - 9) === 'Proxy.sol', 'coverage.json should only contain instrumentation for Proxy.sol');
+    collectGarbage();
+  });
+
   it('truffle tests failing: should generate coverage, cleanup & exit(1)', () => {
     assert(pathExists('./coverage') === false, 'should start without: coverage');
     assert(pathExists('./coverage.json') === false, 'should start without: coverage.json');