Add JSON Reporter output to object similar to #2651

lib/reporters/json.js

@@ -32,7 +32,8 @@ exports = module.exports = JSONReporter;
  * @memberof Mocha.reporters
  * @extends Mocha.reporters.Base
  * @param {Runner} runner - Instance triggers reporter actions.
- * @param {Object} [options] - runner options
+ * @param {Object} [options] - runner options - the property 'output' defines a target file to write to
+ *   the property 'targetObject' an object into which the results of the tests will be written
  */
 function JSONReporter(runner, options = {}) {
   Base.call(this, runner, options);
@@ -43,6 +44,7 @@ function JSONReporter(runner, options = {}) {
   var failures = [];
   var passes = [];
   var output;
+  var targetObject;
 
   if (options.reporterOption && options.reporterOption.output) {
     if (utils.isBrowser()) {
@@ -51,6 +53,10 @@ function JSONReporter(runner, options = {}) {
     output = options.reporterOption.output;
   }
 
+  if (options.reporterOption && 'targetObject' in options.reporterOption) {
+    targetObject = options.reporterOption.targetObject;
+  }
+
   runner.on(EVENT_TEST_END, function (test) {
     tests.push(test);
   });
@@ -89,6 +95,8 @@ function JSONReporter(runner, options = {}) {
         );
         process.stdout.write(json);
       }
+    } else if (targetObject !== undefined) {
+      Object.assign(targetObject, obj);
     } else {
       process.stdout.write(json);
     }

test/reporters/json.spec.js

@@ -230,4 +230,33 @@ describe('JSON reporter', function () {
       );
     });
   });
+
+  describe('when "reporterOption.targetObject" is provided', function () {
+    var theObject = {};
+
+    var options = {
+      reporterOption: {
+        targetObject: theObject
+      }
+    };
+
+    beforeEach(function () {
+      /* eslint no-unused-vars: off */
+      var mochaReporter = new mocha._reporter(runner, options);
+    });
+
+    beforeEach(function () {
+      // Add one test to suite to avoid assertions against empty test results
+      var test = new Test(testTitle, () => {});
+      test.file = testFile;
+      suite.addTest(test);
+    });
+
+    it('should write test results to the object', function (done) {
+      runner.run(function () {
+        expect(theObject, 'not to be empty');
+        done();
+      });
+    });
+  });
 });