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Jqwik API module
There is a newer version: 1.9.2
package net.jqwik.api.arbitraries;

import java.util.*;
import java.util.function.*;

import org.apiguardian.api.*;

import static org.apiguardian.api.API.Status.*;

/**
 * Fluent interface to add functionality to arbitraries that generate instances
 * of type {@linkplain Map}
 */
@API(status = MAINTAINED, since = "1.3.2")
public interface MapArbitrary extends SizableArbitrary> {

	/**
	 * Fix the size to {@code size}.
	 *
	 * @param size The size of the generated map
	 * @return new arbitrary instance
	 */
	@Override
	default MapArbitrary ofSize(int size) {
		return ofMinSize(size).ofMaxSize(size);
	}

	/**
	 * Set lower size boundary {@code minSize} (included).
	 *
	 * @param minSize The minimum size of the generated map
	 * @return new arbitrary instance
	 */
	MapArbitrary ofMinSize(int minSize);

	/**
	 * Set upper size boundary {@code maxSize} (included).
	 *
	 * @param maxSize The maximum size of the generated map
	 * @return new arbitrary instance
	 */
	MapArbitrary ofMaxSize(int maxSize);

	/**
	 * Add the constraint that keys of the generated map must be unique
	 * relating to an element's "feature" being extracted by applying the
	 * {@code by} function on a map entry's key.
	 * The extracted features are being compared using {@linkplain Object#equals(Object)}.
	 *
	 * 
	 *     The constraint can be combined with other {@linkplain #uniqueKeys(Function)} constraints.
	 * 
	 *
	 * @return new arbitrary instance
	 */
	@API(status = MAINTAINED, since = "1.4.0")
	MapArbitrary uniqueKeys(Function by);

	/**
	 * Add the constraint that value of the generated map must be unique
	 * relating to an element's "feature" being extracted by applying the
	 * {@code by} function on a map entry's value.
	 * The extracted features are being compared using {@linkplain Object#equals(Object)}.
	 *
	 * 
	 *     The constraint can be combined with other {@linkplain #uniqueValues(Function)} constraints.
	 * 
	 *
	 * @return new arbitrary instance
	 */
	@API(status = MAINTAINED, since = "1.4.0")
	MapArbitrary uniqueValues(Function by);

	/**
	 * Add the constraint that values of the generated map must be unique,
	 * i.e. no two value must return true when being compared using {@linkplain Object#equals(Object)}.
	 *
	 * 
	 *     The constraint can be combined with other {@linkplain #uniqueValues(Function)} constraints.
	 * 
	 *
	 * @return new arbitrary instance
	 */
	@API(status = MAINTAINED, since = "1.4.0")
	MapArbitrary uniqueValues();

}