Re-introduce qunit.log event

* Now as one parameter, matching the QUnit signature, instead of
  spread as positional parameters.
  https://qunitjs.com/api/callbacks/QUnit.log/

* Now with caveats documented in-code, and no longer promoted/recommended
  from the `summaryOnly` option docs.

Ref #207

chrome/bridge.js

@@ -107,6 +107,33 @@
     sendMessage('qunit.begin');
   });
 
+  // It is encouraged to listen to `qunit.on.testEnd` instead, so that you
+  // don't have to deal with:
+  // * grouping tests by test and module (testName provides "fullName",
+  //   and provides FailedAssertion in one go instead of per-assertion).
+  // * inversion of "todo" tests (i.e. pass when failing).
+  // * undefined actual/expected for passing tests.
+  QUnit.log(function(obj) {
+    var actual;
+    var expected;
+    if (!obj.result) {
+      // Dumping large objects can be very slow, and the dump isn't used for
+      // passing tests, so only dump if the test failed.
+      actual = QUnit.dump.parse(obj.actual);
+      expected = QUnit.dump.parse(obj.expected);
+    }
+    sendMessage('qunit.log', {
+      result: obj.result,
+      actual: actual,
+      expected: expected,
+      message: obj.message,
+      source: obj.source,
+      module: obj.module,
+      name: obj.name,
+      todo: obj.todo
+    });
+  });
+
   QUnit.done(function() {
     sendMessage('qunit.done');
   });

docs/qunit-examples.md

@@ -105,6 +105,7 @@ QUnit events are forwarded to Grunt's event system, enabling you to build custom
 * `qunit.on.runEnd` `(obj)`
 
 * `qunit.begin`
+* `qunit.log` `(obj)`
 * `qunit.done`
 
 In addition to forwarding QUnit's events, the following events are also emitted by the Grunt plugin:

docs/qunit-options.md

@@ -43,7 +43,7 @@ When true, the whole task will not fail when there are individual test failures,
 Type: `boolean`  
 Default: `false`
 
-When true, this will suppress the default logging for individually failed tests. Customized logging can be performed by listening to and responding to `qunit.log` events.
+When true, this will suppress the default logging for individually failed tests. Customized logging can be performed by listening to `qunit.on.testEnd` events.
 
 ## puppeteer
 Type: `Object`