Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/20208 The test suite is designed like the following according to their features. ```scala class CSVReadSchemaSuite extends ReadSchemaSuite with IntegralTypeTest with ToDoubleTypeTest with ToDecimalTypeTest with ToStringTypeTest { override val format: String = "csv" } ``` To add a negative test case, we need to do something like `with NoBooleanTypeTest`. How do you think about that?
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