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The TestAsYouThink Core is a DSL style fluent API in Java to promote good coding practices in tests.

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/*-
 * #%L
 * Test As You Think
 * %%
 * Copyright (C) 2017 Xavier Pigeon and TestAsYouThink contributors
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

package testasyouthink.preparation;

import testasyouthink.function.CheckedConsumer;
import testasyouthink.function.CheckedSupplier;
import testasyouthink.function.Memoized;

import java.util.function.Supplier;

enum ArgumentPreparation {

    INSTANCE;

    <$Argument> Supplier<$Argument> buildMutableArgumentSupplier(Class<$Argument> mutableArgumentClass,
            CheckedConsumer<$Argument> givenStep) {
        return Memoized.of(() -> {
            $Argument argument;
            try {
                argument = mutableArgumentClass.newInstance();
                givenStep.accept(argument);
            } catch (InstantiationException | IllegalAccessException exception) {
                throw new PreparationError("Fails to instantiate the argument of the " //
                        + mutableArgumentClass.getName() + " type!", exception);
            } catch (Throwable throwable) {
                throw new PreparationError("Fails to prepare an argument of the " //
                        + mutableArgumentClass.getName() + " type for the target method!", throwable);
            }
            return argument;
        });
    }

    public <$Argument> Supplier<$Argument> buidArgumentSupplier(CheckedSupplier<$Argument> givenStep) {
        return Memoized.of(() -> {
            try {
                return givenStep.get();
            } catch (Throwable throwable) {
                throw new PreparationError("Fails to prepare an argument for the target method!", throwable);
            }
        });
    }
}