freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/AbstractMainTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.freemarker.generator.cli;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Arrays;

abstract class AbstractMainTest {

    private static final String SPACE = " ";

    String execute(String commandLine) throws IOException {
        try (Writer writer = new StringWriter()) {
            final String[] args = commandLine.split(SPACE);
            if (Main.execute(args, writer) == 0) {
                return writer.toString();
            } else {
                throw new RuntimeException("Executing freemarker-cli failed: " + Arrays.toString(args));
            }
        }
    }
}