fix: convert unhandled rejection to uncaught exception (#235)

Mocha do not catch unhandled rejection by default. Case
will faield until timeout. set `--unhandled-rejections`
to strict, let case fail fast.

.gitignore

@@ -22,8 +22,9 @@ test/fixtures/example-ts-ets/typings/
 **/run/*.json
 .tmp
 .vscode
+.idea
 .cache
 *.log
 package-lock.json
 .nyc_output
-yarn.lock
+yarn.lock

lib/cmd/test.js

@@ -57,7 +57,11 @@ class TestCommand extends Command {
       env: Object.assign({
         NODE_ENV: 'test',
       }, context.env),
-      execArgv: context.execArgv,
+      execArgv: [
+        ...context.execArgv,
+        // https://github.com/mochajs/mocha/issues/2640#issuecomment-1663388547
+        '--unhandled-rejections=strict',
+      ],
     };
     const mochaFile = require.resolve('mocha/bin/_mocha');
     const testArgs = yield this.formatTestArgs(context);

test/fixtures/test-unhandled-rejection/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "test-unhandled-rejection",
+  "files": [
+    "lib"
+  ]
+}

test/fixtures/test-unhandled-rejection/test/a.test.js

@@ -0,0 +1,5 @@
+describe('a.test.js', () => {
+  it('should success', () => {
+    Promise.reject(new Error('mock error'));
+  });
+});

test/lib/cmd/test.test.js

@@ -332,4 +332,12 @@ describe('test/lib/cmd/test.test.js', () => {
         .end(done);
     });
   });
+
+  it('should failed with unhandled rejection', () => {
+    return coffee.fork(eggBin, [ 'test' ], { cwd: path.join(__dirname, '../../fixtures/test-unhandled-rejection') })
+      .debug()
+      .expect('stdout', / Uncaught Error: mock error/)
+      .expect('code', 1)
+      .end();
+  });
 });