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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.function;

import java.util.Objects;

public interface CheckedPredicate<$Value> {

    static <$Value> CheckedPredicate<$Value> isEqual(Object targetRef) {
        return (null == targetRef) ? Objects::isNull : object -> targetRef.equals(object);
    }

    boolean test($Value value) throws Throwable;

    default CheckedPredicate<$Value> and(CheckedPredicate other) {
        Objects.requireNonNull(other);
        return value -> test(value) && other.test(value);
    }

    default CheckedPredicate<$Value> negate() {
        return value -> !test(value);
    }

    default CheckedPredicate<$Value> or(CheckedPredicate other) {
        Objects.requireNonNull(other);
        return value -> test(value) || other.test(value);
    }
}