org.failearly.dataz.template.encoder.support.EncodersTest.java Source code

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Here is the source code for org.failearly.dataz.template.encoder.support.EncodersTest.java

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/*
 * dataZ - Test Support For Data Stores.
 *
 * Copyright 2014-2017 the original author or authors.
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution and is available at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 */

package org.failearly.dataz.template.encoder.support;

import org.apache.commons.lang.StringUtils;
import org.failearly.dataz.template.encoder.Encoder;
import org.failearly.dataz.common.test.ExceptionVerifier;
import org.junit.Test;

import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.sameInstance;
import static org.junit.Assert.assertThat;

/**
 * EncodersTest contains tests for ... .
 */
@SuppressWarnings("unchecked")
public class EncodersTest {

    private static final String ANY_STRING = "Hello world";

    @Test
    public void identityEncoder__should_return_same_object() throws Exception {
        // arrange / given
        final Object any = new Object();
        final Encoder<Object, Object> encoder = Encoders.identityEncoder();

        // assert / then
        assertThat(encoder.encode(any), is(sameInstance(any)));
    }

    @Test
    public void stringToByteArray__should_return_get_bytes_of_string() throws Exception {
        // arrange / given
        final Encoder<String, byte[]> encoder = Encoders.stringToByteArray();

        // assert / then
        assertThat(encoder.encode(ANY_STRING), is(ANY_STRING.getBytes()));
    }

    @Test
    public void charArrayToString__should_return_string() throws Exception {
        // arrange / given
        final Encoder<char[], String> encoder = Encoders.charArrayToString();

        // assert / then
        assertThat(encoder.encode(ANY_STRING.toCharArray()), is(ANY_STRING));
    }

    @Test
    public void byteArrayToString__should_return_string() throws Exception {
        // arrange / given
        final Encoder<byte[], String> encoder = Encoders.byteArrayToString();

        // assert / then
        assertThat(encoder.encode(ANY_STRING.getBytes()), is(ANY_STRING));
    }

    @Test
    public void chain__should_apply_encoders_from_left_to_right() throws Exception {
        // arrange / given
        final Encoder<String, String> encoder = Encoders.chain(Encoders.stringToByteArray(), invertByteArray(),
                Encoders.byteArrayToString());

        // assert / then
        assertThat(encoder.encode(ANY_STRING), is(StringUtils.reverse(ANY_STRING)));
    }

    private static Encoder invertByteArray() {
        return new EncoderBase<byte[], byte[]>() {
            @Override
            public byte[] encode(byte[] value) throws Exception {
                return StringUtils.reverse(new String(value)).getBytes();
            }
        };
    }

    @Test
    @SuppressWarnings("Convert2MethodRef")
    public void chain__must_not_except_no_encoders() throws Exception {
        ExceptionVerifier.on(() -> Encoders.chain()).expect(AssertionError.class)
                .expect("At least one encoder must be provided. No encoder is not permitted!").verify();
    }

}