console: add groupCollapsed()

doc/api/console.md

@@ -298,6 +298,13 @@ Increases indentation of subsequent lines by two spaces.
 If one or more `label`s are provided, those are printed first without the
 additional indentation.
 
+### console.groupCollapsed()
+<!-- YAML
+  added: REPLACEME
+-->
+
+An alias for [`console.group()`][].
+
 ### console.groupEnd()
 <!-- YAML
 added: REPLACEME
@@ -409,6 +416,7 @@ added: v0.1.100
 The `console.warn()` function is an alias for [`console.error()`][].
 
 [`console.error()`]: #console_console_error_data_args
+[`console.group()`]: #console_console_group_label
 [`console.log()`]: #console_console_log_data_args
 [`console.time()`]: #console_console_time_label
 [`console.timeEnd()`]: #console_console_timeend_label

lib/console.js

@@ -226,6 +226,8 @@ Console.prototype.group = function group(...data) {
   this[groupIndent] += '  ';
 };
 
+Console.prototype.groupCollapsed = Console.prototype.group;
+
 Console.prototype.groupEnd = function groupEnd() {
   this[groupIndent] = this[groupIndent].slice(0, this[groupIndent].length - 2);
 };

test/parallel/test-console-group.js

@@ -4,7 +4,7 @@ const common = require('../common');
 const assert = require('assert');
 const Console = require('console').Console;
 
-let stdout, stderr;
+let c, stdout, stderr;
 
 function setup() {
   stdout = '';
@@ -16,6 +16,8 @@ function setup() {
   common.hijackStderr(function(data) {
     stderr += data;
   });
+
+  c = new Console(process.stdout, process.stderr);
 }
 
 function teardown() {
@@ -36,18 +38,18 @@ function teardown() {
 
   const expectedErr = '    More of level 3\n';
 
-  console.log('This is the outer level');
-  console.group();
-  console.log('Level 2');
-  console.group();
-  console.log('Level 3');
-  console.warn('More of level 3');
-  console.groupEnd();
-  console.log('Back to level 2');
-  console.groupEnd();
-  console.log('Back to the outer level');
-  console.groupEnd();
-  console.log('Still at the outer level');
+  c.log('This is the outer level');
+  c.group();
+  c.log('Level 2');
+  c.group();
+  c.log('Level 3');
+  c.warn('More of level 3');
+  c.groupEnd();
+  c.log('Back to level 2');
+  c.groupEnd();
+  c.log('Back to the outer level');
+  c.groupEnd();
+  c.log('Still at the outer level');
 
   assert.strictEqual(stdout, expectedOut);
   assert.strictEqual(stderr, expectedErr);
@@ -63,12 +65,11 @@ function teardown() {
                       'But the second one does not\n';
   const expectedErr = '';
 
-  const c1 = new Console(process.stdout, process.stderr);
   const c2 = new Console(process.stdout, process.stderr);
-  c1.log('No indentation');
+  c.log('No indentation');
   c2.log('None here either');
-  c1.group();
-  c1.log('Now the first console is indenting');
+  c.group();
+  c.log('Now the first console is indenting');
   c2.log('But the second one does not');
 
   assert.strictEqual(stdout, expectedOut);
@@ -83,8 +84,26 @@ function teardown() {
                       '  And this is the data for that label\n';
   const expectedErr = '';
 
-  console.group('This is a label');
-  console.log('And this is the data for that label');
+  c.group('This is a label');
+  c.log('And this is the data for that label');
+
+  assert.strictEqual(stdout, expectedOut);
+  assert.strictEqual(stderr, expectedErr);
+  teardown();
+}
+
+// Check that console.groupCollapsed() is an alias of console.group()
+{
+  setup();
+  const expectedOut = 'Label\n' +
+                      '  Level 2\n' +
+                      '    Level 3\n';
+  const expectedErr = '';
+
+  c.groupCollapsed('Label');
+  c.log('Level 2');
+  c.groupCollapsed();
+  c.log('Level 3');
 
   assert.strictEqual(stdout, expectedOut);
   assert.strictEqual(stderr, expectedErr);