diff --git a/tests/styles/unit/mixins.js b/tests/styles/unit/mixins.js
index <HASH>..<HASH> 100644
--- a/tests/styles/unit/mixins.js
+++ b/tests/styles/unit/mixins.js
@@ -6,7 +6,8 @@ const mixinsPlugin = require('postcss-js-mixins');
 const variablesPlugin = require('postcss-variables');
 const syntax = require('postcss-wee-syntax');
 const stripIndent = require('common-tags').stripIndent;
-const vars = require('../../../styles/variables');
+const register = require('postcss-variables/lib/register');
+const vars = register(require('../../../styles/variables'));
 const variables = vars();
 const mix = require('../../../styles/mixins');
 const mixins = mix(variables);
Register variables in test file

- Fixes issue caused by not registering base variables file to account for wee framework variables file.