pkg/encoding: add test cases for disjunction errors with Validate
For #4002.
Signed-off-by: Tavo Annus <tavo.annus@gmail.com>
Change-Id: I510b85de615386baaeccadeddf8208bc21e099d0
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1219284
Reviewed-by: Paul Jolly <paul@myitcv.io>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
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