Module org.junit.jupiter.params
Package org.junit.jupiter.params.converter

Interface ArgumentConverter

All Known Implementing Classes:
DefaultArgumentConverter, SimpleArgumentConverter, TypedArgumentConverter
@API(status=STABLE,
     since="5.7")
public interface ArgumentConverter
ArgumentConverter is an abstraction that allows an input object to be converted to an instance of a different class.

Such an ArgumentConverter is applied to the method parameter of a @ParameterizedTest method with the help of a @ConvertWith annotation.

See SimpleArgumentConverter in case your implementation only needs to know about the target type instead of the complete ParameterContext.

Implementations must provide a no-args constructor and should not make any assumptions regarding when they are instantiated or how often they are called. Since instances may potentially be cached and called from different threads, they should be thread-safe and designed to be used as singletons.

Since:
5.0
See Also:
SimpleArgumentConverter, ParameterizedTest, ConvertWith, AnnotationConsumer

  • Method Summary

    Modifier and Type Method Description
    Object convert​(Object source, ParameterContext context)
    Convert the supplied source object according to the supplied context.

  • Method Details

    • convert

      Object convert​(Object source, ParameterContext context) throws ArgumentConversionException
      Convert the supplied source object according to the supplied context.
      Parameters:
      source - the source object to convert; may be null
      context - the parameter context where the converted object will be used; never null
      Returns:
      the converted object; may be null but only if the target type is a reference type
      Throws:
      ArgumentConversionException - if an error occurs during the conversion