testing: add full json reporter to show more complete output

src/vs/workbench/contrib/testing/browser/media/testing.css

@@ -68,3 +68,6 @@
 	border-bottom-width: 2px;
 }
 
+.monaco-editor .zone-widget .zone-widget-container.peekview-widget .peekview-title .filename {
+	height: 22px;
+}

test/unit/electron/index.js

@@ -16,6 +16,7 @@ const events = require('events');
 const MochaJUnitReporter = require('mocha-junit-reporter');
 const url = require('url');
 const createStatsCollector = require('mocha/lib/stats-collector');
+const FullJsonStreamReporter = require('../fullJsonStreamReporter');
 
 // Disable render process reuse, we still have
 // non-context aware native modules in the renderer.
@@ -73,6 +74,10 @@ function deserializeRunnable(runnable) {
 }
 
 function importMochaReporter(name) {
+	if (name === 'full-json-stream') {
+		return FullJsonStreamReporter;
+	}
+
 	const reporterPath = path.join(path.dirname(require.resolve('mocha')), 'lib', 'reporters', name);
 	return require(reporterPath);
 }

test/unit/fullJsonStreamReporter.js

+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+const { constants } = require('mocha/lib/runner');
+const BaseRunner = require('mocha/lib/reporters/base');
+
+const {
+	EVENT_TEST_PASS,
+	EVENT_TEST_FAIL,
+	EVENT_RUN_BEGIN,
+	EVENT_RUN_END,
+} = constants;
+
+/**
+ * Similar to the mocha JSON stream, but includes additional information
+ * on failure. Specifically, the mocha json-stream does not include unmangled
+ * expected versus actual results.
+ *
+ * Writes a superset of the data that json-stream normally would.
+ */
+module.exports = class FullJsonStreamReporter extends BaseRunner {
+	constructor(runner, options) {
+		super(runner, options);
+
+		const total = runner.total;
+		runner.once(EVENT_RUN_BEGIN, () => writeEvent(['start', { total }]));
+		runner.once(EVENT_RUN_END, () => writeEvent(['end', this.stats]));
+
+		runner.on(EVENT_TEST_PASS, test => writeEvent(['pass', clean(test)]));
+		runner.on(EVENT_TEST_FAIL, (test, err) => {
+			test = clean(test);
+			test.actual = err.actual;
+			test.expected = err.expected;
+			test.err = err.message;
+			test.stack = err.stack || null;
+			writeEvent(['fail', test]);
+		});
+	}
+}
+
+function writeEvent(event) {
+	process.stdout.write(JSON.stringify(event) + '\n');
+}
+
+const clean = test => ({
+	title: test.title,
+	fullTitle: test.fullTitle(),
+	duration: test.duration,
+	currentRetry: test.currentRetry()
+});