src/test/java/de/ids_mannheim/korap/tokenizer/IPCOffsetTests.java

package de.ids_mannheim.korap.tokenizer;

import org.apache.maven.surefire.shade.org.apache.commons.io.output.ByteArrayOutputStream;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.io.*;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collection;

import static org.junit.Assert.*;

@RunWith(Parameterized.class)
@net.jcip.annotations.NotThreadSafe
public class IPCOffsetTests {
    @Parameterized.Parameters
    public static Collection<Object[]> data() {
        Collection<Object[]> testData = new ArrayList<>();
        for (int i = 1; true; i++) {
            URL inputUrl = IPCOffsetTests.class.getResource(String.format("/other_test_data/test%02d_input.txt", i));
            URL goldUrl = IPCOffsetTests.class.getResource(String.format("/other_test_data/test%02d_gold.txt", i));
            if (inputUrl == null)
                break;
            testData.add(new String[]{inputUrl.getFile(), goldUrl.getFile()});
        }
        return testData;
    }

    private final String input;
    private final String gold;

    static String readFile(String path)
            throws IOException {
        byte[] encoded = Files.readAllBytes(Paths.get(path));
        return new String(encoded, StandardCharsets.UTF_8);
    }

    public IPCOffsetTests(String input, String gold) {
        this.input = input;
        this.gold = gold;
    }

    @Test
    public void testMainWithOffsetsAndSentencesOnDifferentInputFiles() throws IOException {
        final ByteArrayOutputStream myOut = new ByteArrayOutputStream();
        System.setOut(new PrintStream(myOut));
        String[] args = {"-s", input};
        KorAPTokenizerImpl.main(args);
        String goldData = readFile(gold);
        assertEquals(goldData, myOut.toString(StandardCharsets.UTF_8));
    }
}