test: use normalize() for unicode paths

OS X 10.11 changed the unicode normalization form of certain code points
returned by system calls like getcwd() from NFC to NFD which made
results in this test failing.

The consensus of #2165 is to delegate
the task of unicode normalization to the user, and work will continue to
document how to handle unicode in a form-sensitive file system.

PR-URL: #3007
Fixes: #2165
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

test/parallel/test-process-chdir.js

@@ -9,18 +9,26 @@ assert.notStrictEqual(process.cwd(), __dirname);
 process.chdir(__dirname);
 assert.strictEqual(process.cwd(), __dirname);
 
-const dir = path.resolve(common.tmpDir,
-    'weird \uc3a4\uc3ab\uc3af characters \u00e1\u00e2\u00e3');
+let dirName;
+if (process.versions.icu) {
+  // ICU is available, use characters that could possibly be decomposed
+  dirName = 'weird \uc3a4\uc3ab\uc3af characters \u00e1\u00e2\u00e3';
+} else {
+  // ICU is unavailable, use characters that can't be decomposed
+  dirName = 'weird \ud83d\udc04 characters \ud83d\udc05';
+}
+const dir = path.resolve(common.tmpDir, dirName);
 
 // Make sure that the tmp directory is clean
 common.refreshTmpDir();
 
 fs.mkdirSync(dir);
 process.chdir(dir);
-assert.strictEqual(process.cwd(), dir);
+assert.strictEqual(process.cwd().normalize(), dir.normalize());
 
 process.chdir('..');
-assert.strictEqual(process.cwd(), path.resolve(common.tmpDir));
+assert.strictEqual(process.cwd().normalize(),
+                   path.resolve(common.tmpDir).normalize());
 
 assert.throws(function() { process.chdir({}); }, TypeError, 'Bad argument.');
 assert.throws(function() { process.chdir(); }, TypeError, 'Bad argument.');