use relative file paths on the fork.js output

lib/fork.js

@@ -19,6 +19,8 @@ module.exports = function (file, opts) {
 
 	var ps = childProcess.fork(filepath, args, options);
 
+	var relFile = path.relative('.', file);
+
 	var promise = new Promise(function (resolve, reject) {
 		var testResults;
 
@@ -31,19 +33,19 @@ module.exports = function (file, opts) {
 
 		ps.on('exit', function (code) {
 			if (code > 0 && code !== 143) {
-				return reject(new Error(file + ' exited with a non-zero exit code: ' + code));
+				return reject(new Error(relFile + ' exited with a non-zero exit code: ' + code));
 			}
 
 			if (testResults) {
 				resolve(testResults);
 			} else {
-				reject(new Error('Test results were not received from: ' + file));
+				reject(new Error('Test results were not received from ' + relFile));
 			}
 		});
 
 		ps.on('no-tests', function (data) {
 			send(ps, 'teardown');
-			var message = 'No tests found in ' + path.relative('.', file);
+			var message = 'No tests found in ' + relFile;
 			if (!data.avaRequired) {
 				message += ', make sure to import "ava" at the top of your test file';
 			}
@@ -58,7 +60,7 @@ module.exports = function (file, opts) {
 		}
 
 		event.name = event.name.replace(/^ava\-/, '');
-		event.data.file = file;
+		event.data.file = relFile;
 
 		debug('ipc %s:\n%o', event.name, event.data);
 		ps.emit(event.name, event.data);

test/fork.js

@@ -28,7 +28,7 @@ test('resolves promise with tests info', function (t) {
 		.then(function (info) {
 			t.is(info.stats.passCount, 1);
 			t.is(info.tests.length, 1);
-			t.is(info.file, file);
+			t.is(info.file, path.relative('.', file));
 			t.end();
 		});
 });