Clear error message for .pick from empty list

quicktheories / QuickTheories

Property based testing for Java 8

Apache License 2.0

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Clear error message for .pick from empty list #59

Closed matthewleon closed 5 years ago

matthewleon commented 5 years ago

Currently, attempting to Generate.pick from an empty list will fail, but with a somewhat confusing message about an illegal range from -1 to 0. This error message should be much clearer.