grunt-casper/test/fixtures/testLogColors.js

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var casper = require('casper').create({
  verbose: true,
  logLevel: 'debug'
});

casper.log('this is a debug message', 'debug');
casper.log('and an informative one', 'info');
casper.log('and a warning', 'warning');
casper.log('and an error', 'error');

casper.exit();