relative file path and colors

lib/fork.js

@@ -24,6 +24,7 @@ if (env.NODE_PATH) {
 module.exports = function (file, opts) {
 	opts = objectAssign({
 		file: file,
+		baseDir: process.cwd(),
 		tty: process.stdout.isTTY ? {
 			columns: process.stdout.columns,
 			rows: process.stdout.rows

lib/test.js

@@ -1,4 +1,6 @@
 'use strict';
+var path = require('path');
+var chalk = require('chalk');
 var inspect = require('util').inspect;
 var isGeneratorFn = require('is-generator-fn');
 var maxTimeout = require('max-timeout');
@@ -72,14 +74,15 @@ Test.prototype._setAssertError = function (err) {
 	if (data) {
 		console.error(
 			[
-				'Improper usage of t.throws detected at %s (%d:%d).',
+				'Improper usage of t.throws detected at ' + chalk.bold.yellow('%s (%d:%d)') + '.',
 				'You should wrap the following expression in a function:',
-				'  %s',
+				chalk.cyan('  %s'),
 				'Like this:',
-				'  function() {\n    %s\n  }',
-				'See https://github.com/sindresorhus/ava#throwsfunctionpromise-error-message for more details.'
+				chalk.cyan('  function() {\n    %s\n  }'),
+				'Visit the following URL for more details:',
+				'  ' + chalk.blue.underline('https://github.com/sindresorhus/ava#throwsfunctionpromise-error-message')
 			].join('\n\n'),
-			data.filename,
+			path.relative(globals.options.baseDir, data.filename),
 			data.line,
 			data.column,
 			data.source,