diff --git a/.travis.yml b/.travis.yml
index 1cda1e9..09522cb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: node_js
 node_js:
   - 6
+  - 8
 
 notifications:
   email:
diff --git a/test/optimizeImage.test.js b/test/optimizeImage.test.js
index a0efb8e..524a930 100644
--- a/test/optimizeImage.test.js
+++ b/test/optimizeImage.test.js
@@ -105,7 +105,7 @@ describe('hexo-image-minifier', () => {
     return promise.then(() => {
       for (const file of fixtures) {
         if (targetFile.indexOf(path.extname(file)) !== -1
-          && micromatch.isMatch(file, exclude, { nocase: true, basename: true })) {
+          && !micromatch.isMatch(file, exclude, { nocase: true, basename: true })) {
           expect(hexoRoute.buffer[file]).to.be.ok;
           expect(fileSize[file]).to.be.greaterThan(hexoRoute.buffer[file].length);
         } else {