test: fix tests on Windows

lib/index.js

@@ -65,11 +65,11 @@ module.exports = function (source) {
   }
 
   // module id for scoped CSS & hot-reload
-  const shortFilePath = path
+  const rawShortFilePath = path
     .relative(context, resourcePath)
-    .replace(/\\/g, '/')
-    .replace(/^(\.\.\/)+/, '') +
-    resourceQuery
+    .replace(/^(\.\.[\/\\])+/, '')
+
+  const shortFilePath = rawShortFilePath.replace(/\\/g, '/') + resourceQuery
 
   const id = hash(
     isProduction
@@ -161,7 +161,7 @@ var component = normalizer(
 
   // Expose filename. This is used by the devtools and vue runtime warnings.
   if (!isProduction) {
-    code += `\ncomponent.options.__file = ${JSON.stringify(shortFilePath)}`
+    code += `\ncomponent.options.__file = ${JSON.stringify(rawShortFilePath)}`
   }
 
   code += `\nexport default component.exports`

test/utils.js

@@ -43,7 +43,7 @@ const baseConfig = {
 }
 
 function genId (file) {
-  return hash(path.join('test', 'fixtures', file))
+  return hash(path.join('test', 'fixtures', file).replace(/\\/g, '/'))
 }
 
 function bundle (options, cb, wontThrowError) {