Add test and fix exists behaviour for relative symlinks

Author: timvahlbrock

lib/binding.js

@@ -1494,7 +1494,11 @@ Binding.prototype.exists = function (filepath, callback, ctx) {
 
     if (item) {
       if (item instanceof SymbolicLink) {
-        return this.exists(item.getPath(), callback, ctx);
+        return this.exists(
+          path.resolve(path.dirname(filepath), item.getPath()),
+          callback,
+          ctx,
+        );
       }
       return true;
     }

test/lib/fs.link-symlink.spec.js

@@ -309,4 +309,10 @@ describe('fs.symlinkSync(srcpath, dstpath, [type])', function () {
     fs.symlinkSync('dir', 'link');
     assert.isTrue(fs.statSync('link').isDirectory());
   });
+
+  it('exists works if symlink is relative', function () {
+    fs.renameSync('file.txt', 'dir/file.txt');
+    fs.symlinkSync('file.txt', 'dir/link.txt');
+    assert.isTrue(fs.existsSync('dir/link.txt'));
+  });
 });