info.archinnov.achilles.type.CounterBuilderTest.java Source code

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Here is the source code for info.archinnov.achilles.type.CounterBuilderTest.java

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/*
 * Copyright (C) 2012-2014 DuyHai DOAN
 *
 *  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 info.archinnov.achilles.type;

import static org.fest.assertions.api.Assertions.assertThat;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class CounterBuilderTest {

    @Rule
    public ExpectedException exception = ExpectedException.none();

    @Test
    public void should_incr() throws Exception {
        Counter counter = CounterBuilder.incr();
        assertThat(counter.get()).isEqualTo(1L);
    }

    @Test
    public void should_incr_n() throws Exception {
        Counter counter = CounterBuilder.incr(10L);
        assertThat(counter.get()).isEqualTo(10L);
    }

    @Test
    public void should_decr() throws Exception {
        Counter counter = CounterBuilder.decr();
        assertThat(counter.get()).isEqualTo(-1L);
    }

    @Test
    public void should_decr_n() throws Exception {
        Counter counter = CounterBuilder.decr(10L);
        assertThat(counter.get()).isEqualTo(-10L);
    }

    @Test
    public void should_be_able_to_serialize_and_deserialize_counter_impl() throws Exception {

        ObjectMapper mapper = new ObjectMapper();
        Counter counter = CounterBuilder.incr(11L);

        String serialized = mapper.writeValueAsString(counter);
        assertThat(serialized).isEqualTo("\"11\"");

        Counter deserialized = mapper.readValue(serialized, Counter.class);
        assertThat(deserialized.get()).isEqualTo(11L);

        assertThat(mapper.writeValueAsString(CounterBuilder.incr(0))).isEqualTo("\"0\"");
    }

    @Test
    public void should_be_able_to_serialize_and_deserialize_null_counter() throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        Counter counter = new TestCounter();

        String serialized = mapper.writeValueAsString(counter);
        assertThat(serialized).isEqualTo("\"\"");
        serialized = mapper.writeValueAsString(null);
        assertThat(serialized).isEqualTo("null");

        Counter deserialized = mapper.readValue("null", Counter.class);
        assertThat(deserialized).isNull();

    }

    private static class TestCounter implements Counter {

        private Long value;

        @Override
        public Long get() {
            return value;
        }

        @Override
        public void incr() {
            value++;
        }

        @Override
        public void incr(long increment) {
            value += increment;
        }

        @Override
        public void decr() {
            value--;
        }

        @Override
        public void decr(long decrement) {
            value -= decrement;
        }

    }
}