fix transform locations in tests

packages/babel-core/test/_transformation-helper.js

@@ -2,7 +2,7 @@ require("../lib/api/node");
 
 var buildExernalHelpers = require("../lib/tools/build-external-helpers");
 var getFixtures         = require("mocha-fixtures");
-var transform           = require("../lib/transformation");
+var transform           = require("../lib/api/node").transform;
 var sourceMap           = require("source-map");
 var codeFrame           = require("babel-code-frame");
 var register            = require("../register");

packages/babel-core/test/api.js

@@ -1,7 +1,7 @@
 require("../lib/api/node");
 
 var buildExternalHelpers = require("../lib/tools/build-external-helpers");
-var transform            = require("../lib/transformation");
+var transform            = require("../lib/api/node").transform;
 var Pipeline             = require("../lib/transformation/pipeline");
 var assert               = require("assert");
 var File                 = require("../lib/transformation/file").default;

packages/babel-core/test/path.js

@@ -1,4 +1,4 @@
-var transform = require("../lib/transformation");
+var transform = require("../lib/api/node").transform;
 var Plugin    = require("../lib/transformation/plugin");
 var babel     = require("../lib/api/node");
 var chai      = require("chai");