com.diffplug.gradle.GradleIntegrationTest.java Source code

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Here is the source code for com.diffplug.gradle.GradleIntegrationTest.java

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/*
 * Copyright 2016 DiffPlug
 *
 * 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 com.diffplug.gradle;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;
import java.util.ListIterator;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import org.apache.commons.io.FileUtils;
import org.gradle.testkit.runner.GradleRunner;
import org.junit.Rule;
import org.junit.rules.TemporaryFolder;

import com.diffplug.common.base.Errors;
import com.diffplug.common.base.StringPrinter;
import com.diffplug.common.tree.TreeDef;
import com.diffplug.common.tree.TreeStream;

public class GradleIntegrationTest {
    @Rule
    public TemporaryFolder folder = new TemporaryFolder();

    protected void write(String path, String... lines) throws IOException {
        String content = Arrays.asList(lines).stream().collect(Collectors.joining("\n")) + "\n";
        Path target = folder.getRoot().toPath().resolve(path);
        Files.createDirectories(target.getParent());
        Files.write(target, content.getBytes(StandardCharsets.UTF_8));
    }

    protected String read(String path) throws IOException {
        Path target = folder.getRoot().toPath().resolve(path);
        String content = new String(Files.readAllBytes(target), StandardCharsets.UTF_8);
        return FileMisc.toUnixNewline(content);
    }

    protected File file(String path) {
        return folder.getRoot().toPath().resolve(path).toFile();
    }

    protected GradleRunner gradleRunner() {
        return GradleRunner.create().withProjectDir(folder.getRoot()).withPluginClasspath();
    }

    /** Dumps the complete file contents of the folder to the console. */
    protected String getContents() throws IOException {
        return getContents(subPath -> !subPath.startsWith(".gradle"));
    }

    protected String getContents(Predicate<String> subpathsToInclude) throws IOException {
        TreeDef<File> treeDef = TreeDef.forFile(Errors.rethrow());
        List<File> files = TreeStream.depthFirst(treeDef, folder.getRoot()).filter(file -> file.isFile())
                .collect(Collectors.toList());

        ListIterator<File> iterator = files.listIterator(files.size());
        int rootLength = folder.getRoot().getAbsolutePath().length() + 1;
        return StringPrinter.buildString(printer -> {
            Errors.rethrow().run(() -> {
                while (iterator.hasPrevious()) {
                    File file = iterator.previous();
                    String subPath = file.getAbsolutePath().substring(rootLength);
                    if (subpathsToInclude.test(subPath)) {
                        printer.println("### " + subPath + " ###");
                        printer.println(read(subPath));
                    }
                }
            });
        });
    }

    /** Copies the test to some directory for external debugging. */
    protected void copyTo(String path) throws IOException {
        File destination = new File(path);
        FileUtils.copyDirectory(folder.getRoot(), destination);
    }
}