test: assert diff no color

PR-URL: #24181
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: Florin-Daniel BÎLBÎE

test/pseudo-tty/test-assert-no-color.js

@@ -0,0 +1,19 @@
+'use strict';
+require('../common');
+constassert=require('assert').strict;
+
+process.env.NODE_DISABLE_COLORS=true;
+
+try{
+assert.deepStrictEqual({},{foo: 'bar'});
+}catch(error){
+constexpected=
+'Expected values to be strictly deep-equal:\n'+
+'+ actual - expected\n'+
+'\n'+
+'+ {}\n'+
+'- {\n'+
+'- foo: \'bar\'\n'+
+'- }';
+assert.strictEqual(error.message,expected);
+}