feat(cov): add nyc instrument passthrough

README.md

@@ -170,6 +170,12 @@ You can pass any mocha argv.
 - `-x` add dir ignore coverage, support multiple argv
 - `--prerequire` prerequire files for coverage instrument, you can use this options if load files slowly when call `mm.app` or `mm.cluster`
 - `--typescript` / `--ts` enable typescript support, default to `false`, if true, will auto add `.ts` extension and ignore `typings` and `d.ts`.
+- `--nyc` nyc instruments passthrough
+  > This is primaryly for adding additional nyc reporters because `egg-bin cov` calls `nyc` with some fixed params like `-r json -r lcov...`, which overides `reporter` key in `.nycrc`/`package.json`.
+  ```bash
+  egg-bin cov --nyc="--reporter=teamcity -r text"
+  ```
+
 - also support all test params above.
 
 #### environment

lib/cmd/cov.js

@@ -25,6 +25,10 @@ class CovCommand extends Command {
         description: 'prerequire files for coverage instrument',
         type: 'boolean',
       },
+      nyc: {
+        description: 'nyc instruments passthrough',
+        type: 'string',
+      },
     };
 
     // you can add ignore dirs here
@@ -116,6 +120,14 @@ class CovCommand extends Command {
       this.addExclude('**/*.d.ts');
     }
 
+    // nyc args passthrough
+    let nycArgs = context.argv.nyc;
+    delete context.argv.nyc;
+    if (nycArgs) {
+      nycArgs = nycArgs.substring(1, nycArgs.length - 1);
+      covArgs = covArgs.concat(nycArgs.split(' '));
+    }
+
     for (const exclude of this[EXCLUDES]) {
       covArgs.push('-x');
       covArgs.push(exclude);

test/lib/cmd/cov.test.js

@@ -198,4 +198,15 @@ describe('test/lib/cmd/cov.test.js', () => {
       .expect('code', 0)
       .end();
   });
+
+  it('should passthrough nyc args', done => {
+    mm(process.env, 'TESTS', 'test/**/*.test.js');
+    mm(process.env, 'NYC_CWD', cwd);
+    coffee.fork(eggBin, [ 'cov', '--nyc="--reporter=teamcity"' ], { cwd })
+      // .debug()
+      .expect('stdout', /should success/)
+      .expect('stdout', /##teamcity\[blockOpened name='Code Coverage Summary'\]/)
+      .expect('stdout', /##teamcity\[blockClosed name='Code Coverage Summary'\]/)
+      .end(done);
+  });
 });