LazyTest.java

/*
 * Copyright (c) 2014 the original author or authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.werval.runtime.util;

import java.util.ArrayList;
import java.util.List;
import org.junit.Test;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.notNullValue;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

/**
 * Lazy Test.
 */
public class LazyTest
{
    @Test
    public void eagerLazy()
    {
        Lazy<String> eager = Lazy.of( "foo" );
        assertThat( eager.get(), equalTo( "foo" ) );
    }

    @Test
    public void lazyByType()
    {
        Lazy<List> lazy = Lazy.of( ArrayList.class );
        List list = lazy.get();
        assertThat( list, notNullValue() );
        assertTrue( list == lazy.get() );
    }

    @Test
    public void lazySupplied()
    {
        Lazy<List<String>> lazy = Lazy.of( () -> new ArrayList<>() );
        List<String> list = lazy.get();
        assertThat( list, notNullValue() );
        assertTrue( list == lazy.get() );
    }
}