Fix tests on windows

appveyor.yml

@@ -0,0 +1,18 @@
+environment:
+  matrix:
+    - nodejs_version: "5"
+    - nodejs_version: "4"
+    - nodejs_version: "0.12"
+
+version: "{build}"
+build: off
+deploy: off
+
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - npm install
+
+test_script:
+  - node --version
+  - npm --version
+  - npm test

lib/formatter.js

@@ -72,7 +72,7 @@ module.exports = function(opts) {
 
     function logFrom(fromValue) {
       if (fromValue.charAt(0) === '<') return fromValue;
-      return path.relative(process.cwd(), fromValue);
+      return path.relative(process.cwd(), fromValue).split(path.sep).join('/');
     }
   };
 };