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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