ImmutableAnnotationTest.java

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package com.jcabi;

import com.jcabi.aspects.Immutable;
import org.hamcrest.MatcherAssert;
import org.hamcrest.Matchers;
import org.junit.Test;

/**
 * Test case for {@link Immutable} annotation.
 * {@link RetryOnFailure} annotation works.
 * @author Yegor Bugayenko (yegor@tpc2.com)
 * @version $Id: eb650e0338f6ee4a37677dc158680bb2fb875051 $
 */
public final class ImmutableAnnotationTest {

    /**
     * Immutable annotation validate class mutability.
     * @throws Exception If something goes wrong
     */
    @Test(expected = IllegalStateException.class)
    public void validatesClassImmutability() throws Exception {
        new Mutable();
    }

    /**
     * Immutable annotation validate class mutability.
     * @throws Exception If something goes wrong
     */
    @Test
    public void validatesClassWithTrueImmutability() throws Exception {
        new TruelyImmutable();
    }

    /**
     * Supposedly immutable class.
     */
    @Immutable
    private static final class Mutable {
        private transient String data = "";
    }

    /**
     * Truely immutable class.
     */
    @Immutable
    private static final class TruelyImmutable {
        private final transient String data = "";
    }

}