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Could you provide your test config?
I had a similar issue, which was caused by the wrong configuration. In dev/prod env, styles were loaded by ruby gem, but the whole test env is run by node. So in test config, I had to add loaders for css:
environment.loaders.prepend('css', {
test: /\.css$/,
use: [
'vue-style-loader',
'css-loader',
'sass-loader',
],
});
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