test: assert tmp and fixture dirs different

PR-URL: https://github.com/nodejs/io.js/pull/2015
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

test/parallel/test-fs-realpath.js

@@ -40,6 +40,7 @@ function tmp(p) {
 
 var fixturesAbsDir = common.fixturesDir;
 var tmpAbsDir = common.tmpDir;
+assert(fixturesAbsDir !== tmpAbsDir);
 
 console.error('absolutes\n%s\n%s', fixturesAbsDir, tmpAbsDir);
 
@@ -298,8 +299,6 @@ function test_deep_symlink_mix(callback) {
     return runNextTest();
   }
 
-  // todo: check to see that common.fixturesDir is not rooted in the
-  //       same directory as our test symlink.
   /*
   /tmp/node-test-realpath-f1 -> ../tmp/node-test-realpath-d1/foo
   /tmp/node-test-realpath-d1 -> ../node-test-realpath-d2