Stylus mixins not working when running tests via jest in single file vue component?

Question

JavaScript

Good day to all!
I'm trying to run the test, but it swears at the mixin, although var, for example, work out fine.

jest config:

module.exports = {
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/$1',
    '^~/(.*)$': '<rootDir>/$1',
    '^[email protected]/(.*)$': '<rootDir>/$1',
    '^vue$': 'vue/dist/vue.common.js',
  },
  moduleFileExtensions: ['js', 'vue', 'json'],
  transform: {
    '^.+\\.js$': 'babel-jest',
    '.*\\.(vue)$': 'vue-jest',
  },
};