Add regression test for #2027

test/integration/options/watch.spec.js

@@ -115,6 +115,20 @@ describe('--watch', function() {
         expect(results[1].failures, 'to have length', 1);
       });
     });
+
+    // Regresseion test for https://github.com/mochajs/mocha/issues/2027
+    it('respects --fgrep on re-runs', function() {
+      const testFile = path.join(this.tempDir, 'test.js');
+      copyFixture('options/grep', testFile);
+
+      return runMochaWatch([testFile, '--fgrep', 'match'], this.tempDir, () => {
+        touchFile(testFile);
+      }).then(results => {
+        expect(results, 'to have length', 2);
+        expect(results[0].tests, 'to have length', 2);
+        expect(results[1].tests, 'to have length', 2);
+      });
+    });
   });
 });