Module org.junit.jupiter.params

Package org.junit.jupiter.params.aggregator

Interface ArgumentsAggregator

All Known Implementing Classes:

SimpleArgumentsAggregator

@API(status=STABLE,
     since="5.7")
public interface ArgumentsAggregator

ArgumentsAggregator is an abstraction for the aggregation of arguments provided by an ArgumentsProvider for a single invocation of a @ParameterizedTest method into a single object.

An ArgumentsAggregator is applied to a method parameter of a @ParameterizedTest method via the @AggregateWith annotation.

The result of the aggregation will be passed as an argument to the @ParameterizedTest method for the annotated parameter.

A common use case is the aggregation of multiple columns from a single line in a CSV file into a domain object such as a Person, Address, Order, etc.

Implementations must provide a no-args constructor or a single unambiguous constructor to use parameter resolution. They 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.

Since:

5.2

See Also:

• AggregateWith
• ArgumentsAccessor
• SimpleArgumentsAggregator
• ParameterizedTest

Method Summary

Modifier and Type	Method	Description
Object	aggregateArguments(ArgumentsAccessor accessor, ParameterContext context)	Aggregate the arguments contained in the supplied accessor into a single object.
default Object	aggregateArguments(ArgumentsAccessor accessor, FieldContext context)	Aggregate the arguments contained in the supplied accessor into a single object.

Method Details

aggregateArguments

Object aggregateArguments(ArgumentsAccessor accessor,
 ParameterContext context)
                   throws ArgumentsAggregationException

Aggregate the arguments contained in the supplied accessor into a single object.

Parameters:

accessor - an ArgumentsAccessor containing the arguments to be aggregated; never null

context - the parameter context where the aggregated result is to be supplied; never null

Returns:

the aggregated result; may be null but only if the target type is a reference type

Throws:

ArgumentsAggregationException - if an error occurs during the aggregation

aggregateArguments

@API(status=EXPERIMENTAL,
     since="5.13")
default Object aggregateArguments(ArgumentsAccessor accessor,
 FieldContext context)
                           throws ArgumentsAggregationException

Aggregate the arguments contained in the supplied accessor into a single object.

Parameters:

accessor - an ArgumentsAccessor containing the arguments to be aggregated; never null

context - the field context where the aggregated result is to be injected; never null

Returns:

the aggregated result; may be null but only if the target type is a reference type

Throws:

ArgumentsAggregationException - if an error occurs during the aggregation

Since:

5.13