Add tests for Single-schema items and unevaluatedItems#317

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Julian merged 2 commits intojson-schema-org:mainfrom

Relequestual:#291

Jun 30, 2022

Commits on Jun 30, 2022

Add tests for Single-schema items and unevaluatedItems

Relequestual
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Julian
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Forward-port and reword the new unevaluatedItems test.
Julian
committed