Java example source code file (CtwTest.java)

This example Java source code file (CtwTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, bufferedreader, ctwtest, error, exception, filewriter, ioexception, outputanalyzer, processbuilder, string, stringbuilder, util

The CtwTest.java Java example source code

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import java.util.List;
import java.util.Collections;
import java.util.ArrayList;

import java.io.File;
import java.io.Writer;
import java.io.FileWriter;
import java.io.IOException;
import java.io.BufferedReader;

import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.nio.charset.Charset;

import com.oracle.java.testlibrary.JDKToolFinder;
import com.oracle.java.testlibrary.OutputAnalyzer;

public abstract class CtwTest {
    protected final String[] shouldContain;
    protected CtwTest(String[] shouldContain) {
        this.shouldContain = shouldContain;
    }

    public void run(String[] args) throws Exception {
        if (args.length == 0) {
            throw new Error("args is empty");
        }
        switch (args[0]) {
            case "prepare":
                prepare();
                break;
            case "check":
                check(args);
                break;
            default:
                throw new Error("unregonized action -- " + args[0]);
        }
    }

    protected void prepare() throws Exception { }

    protected void check(String[] args) throws Exception  {
        if (args.length < 2) {
            throw new Error("logfile isn't specified");
        }
        String logfile = args[1];
        try (BufferedReader r = Files.newBufferedReader(Paths.get(logfile),
                Charset.defaultCharset())) {
            OutputAnalyzer output = readOutput(r);
           for (String test : shouldContain) {
                output.shouldContain(test);
            }
        }
    }

    private static OutputAnalyzer readOutput(BufferedReader reader)
            throws IOException {
        StringBuilder builder = new StringBuilder();
        String eol = String.format("%n");
        String line;

        while ((line = reader.readLine()) != null) {
            builder.append(line);
            builder.append(eol);
        }
        return new OutputAnalyzer(builder.toString(), "");
    }

    protected void dump(OutputAnalyzer output, String name) {
        try (Writer w = new FileWriter(name + ".out")) {
            String s = output.getStdout();
            w.write(s, s.length(), 0);
        } catch (IOException io) {
            io.printStackTrace();
        }
        try (Writer w = new FileWriter(name + ".err")) {
            String s = output.getStderr();
            w.write(s, s.length(), 0);
        } catch (IOException io) {
            io.printStackTrace();
        }
    }

    protected ProcessBuilder createJarProcessBuilder(String... command)
            throws Exception {
        String javapath = JDKToolFinder.getJDKTool("jar");

        ArrayList<String> args = new ArrayList<>();
        args.add(javapath);
        Collections.addAll(args, command);

        return new ProcessBuilder(args.toArray(new String[args.size()]));
    }
}