Added some tests

tests/node_modules/dotignore/test/.1-ignore

@@ -0,0 +1,2 @@
+*ignored
+!a/not*

tests/node_modules/dotignore/test/1-expected

@@ -0,0 +1,7 @@
++ .ignore
+- a/a/notignored
+- a/ignored
++ a/notignored
++ a/notlisted
++ expected
++ test.js

tests/node_modules/dotignore/test/index.js

@@ -0,0 +1,53 @@
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var rules = String(fs.readFileSync(path.join(process.cwd(), 'test', '.1-ignore')));
+var matcher = require('../').createMatcher(rules);
+var test = require('tape');
+
+var checkDir = function checkDir(dir, paths, output) {
+  if (!output) { output = ''; }
+  paths.forEach(function (pathArr) {
+    var isDir = Array.isArray(pathArr);
+    var filename = isDir ? pathArr[0] : pathArr;
+    var resolved = path.join(dir, filename);
+    if (matcher.shouldIgnore(resolved)) {
+      output += '- ' + resolved + '\n';
+    } else if (isDir) {
+      output = checkDir(resolved, pathArr[1], output);
+    } else {
+      output += '+ ' + resolved + '\n';
+    }
+  });
+  return output;
+};
+
+test('expected output', function (t) {
+  process.chdir(path.join(process.cwd(), 'test'));
+
+  var root = [
+    '.ignore',
+    [
+      'a',
+      [
+        ['a', ['notignored']],
+        'ignored',
+        'notignored',
+        'notlisted'
+      ]
+    ],
+    'expected',
+    'test.js'
+  ];
+
+  var output = checkDir('.', root);
+
+  t.equal(output, String(fs.readFileSync('1-expected')));
+  t.end();
+});
+
+test('delimiter defaults to path.sep', function (t) {
+  t.equal(matcher.delimiter, path.sep);
+  t.end();
+});