spec/lib/jspec.js
function(actual, expected, negate, name) {
      return 'expected ' + puts(actual) + ' to ' + 
               (negate ? 'not ' : '') + 
                  name.replace(/_/g, ' ') +
                    ' ' + (expected.length > 1 ?
                      puts.apply(this, expected.slice(1)) :
                        '')
    }
function(actual, expected, negate, name) {
      return 'expected ' + puts(actual) + ' to ' + 
               (negate ? 'not ' : '') + 
                  name.replace(/_/g, ' ') +
                    ' ' + (expected.length > 1 ?
                      puts.apply(this, expected.slice(1)) :
                        '')
    }
function ( actual , expected , negate , name ) { return 'expected ' + puts ( actual ) + ' to ' + ( negate ? 'not ' : '' ) + name . replace ( / _ / g , ' ' ) + ' ' + ( expected . length > 1 ? puts . apply ( this , expected . slice ( 1 ) ) : '' ) }
Default matcher message callback.

@api private
Default matcher message callback .