Port test-path-zero-length-strings.

Author: goto-bus-stop

test/index.js

@@ -6,3 +6,4 @@ require('./test-path-isabsolute');
 require('./test-path-join');
 require('./test-path-relative');
 require('./test-path-resolve');
+require('./test-path-zero-length-strings');

test/test-path-zero-length-strings.js

@@ -0,0 +1,53 @@
+'use strict';
+
+// These testcases are specific to one uncommon behavior in path module. Few
+// of the functions in path module, treat '' strings as current working
+// directory. This test makes sure that the behavior is intact between commits.
+// See: https://github.com/nodejs/node/pull/2106
+
+var tape = require('tape');
+var path = require('../');
+var pwd = process.cwd();
+
+tape('path.join zero-length', function (t) {
+  // join will internally ignore all the zero-length strings and it will return
+  // '.' if the joined string is a zero-length string.
+  t.strictEqual(path.posix.join(''), '.');
+  t.strictEqual(path.posix.join('', ''), '.');
+  if (path.win32) t.strictEqual(path.win32.join(''), '.');
+  if (path.win32) t.strictEqual(path.win32.join('', ''), '.');
+  t.strictEqual(path.join(pwd), pwd);
+  t.strictEqual(path.join(pwd, ''), pwd);
+  t.end();
+});
+
+tape('path.join zero-length', function (t) {
+  // normalize will return '.' if the input is a zero-length string
+  t.strictEqual(path.posix.normalize(''), '.');
+  if (path.win32) t.strictEqual(path.win32.normalize(''), '.');
+  t.strictEqual(path.normalize(pwd), pwd);
+  t.end();
+});
+
+tape('path.isAbsolute zero-length', function (t) {
+  // Since '' is not a valid path in any of the common environments, return false
+  t.strictEqual(path.posix.isAbsolute(''), false);
+  if (path.win32) t.strictEqual(path.win32.isAbsolute(''), false);
+  t.end();
+});
+
+tape('path.resolve zero-length', function (t) {
+  // resolve, internally ignores all the zero-length strings and returns the
+  // current working directory
+  t.strictEqual(path.resolve(''), pwd);
+  t.strictEqual(path.resolve('', ''), pwd);
+  t.end();
+});
+
+tape('path.relative zero-length', function (t) {
+  // relative, internally calls resolve. So, '' is actually the current directory
+  t.strictEqual(path.relative('', pwd), '');
+  t.strictEqual(path.relative(pwd, ''), '');
+  t.strictEqual(path.relative(pwd, pwd), '');
+  t.end();
+});