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If we want to have full localized test we should have localizable golden files. It could work like resource bundles i.e. in goldenfiles directory would be: test.pass test.pass_ja and the right version would be choosed using the current locale.
Interesting feature. Juts FYI, please note, instead of this feature, you can currently use a workaround by defining your test.pass filename in resource bundle, load it dynamically via Bundle.getResource() and compare the files via assertFile().