test/tools/launcher/TestHelper.java - platform/external/oj-libjdwp - Gitiles

 /*
  * Copyright (c) 2008, 2012, 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.io.StringWriter;
 import java.io.PrintWriter;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileFilter;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.PrintStream;
 import java.nio.charset.Charset;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.nio.file.Files;
 import java.nio.file.FileVisitResult;
 import java.nio.file.SimpleFileVisitor;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import javax.tools.JavaCompiler;
 import javax.tools.ToolProvider;

 import static java.nio.file.StandardCopyOption.*;
 import static java.nio.file.StandardOpenOption.*;

 /**
  * This class provides some common utilities for the launcher tests.
  */
 public class TestHelper {
     // commonly used jtreg constants
     static final File TEST_CLASSES_DIR;
     static final File TEST_SOURCES_DIR;

     static final String JAVAHOME = System.getProperty("java.home");
     static final String JAVA_BIN;
     static final boolean isSDK = JAVAHOME.endsWith("jre");
     static final String javaCmd;
     static final String javawCmd;
     static final String java64Cmd;
     static final String javacCmd;
     static final JavaCompiler compiler;

     static final boolean debug = Boolean.getBoolean("TestHelper.Debug");
     static final boolean isWindows =
             System.getProperty("os.name", "unknown").startsWith("Windows");
     static final boolean isMacOSX =
             System.getProperty("os.name", "unknown").contains("OS X");
     static final boolean is64Bit =
             System.getProperty("sun.arch.data.model").equals("64");
     static final boolean is32Bit =
             System.getProperty("sun.arch.data.model").equals("32");
     static final boolean isSolaris =
             System.getProperty("os.name", "unknown").startsWith("SunOS");
     static final boolean isLinux =
             System.getProperty("os.name", "unknown").startsWith("Linux");
     static final boolean isDualMode = isSolaris;
     static final boolean isSparc = System.getProperty("os.arch").startsWith("sparc");

     // make a note of the golden default locale
     static final Locale DefaultLocale = Locale.getDefault();

     static final String JAVA_FILE_EXT  = ".java";
     static final String CLASS_FILE_EXT = ".class";
     static final String JAR_FILE_EXT   = ".jar";
     static final String EXE_FILE_EXT   = ".exe";
     static final String JLDEBUG_KEY     = "_JAVA_LAUNCHER_DEBUG";
     static final String EXPECTED_MARKER = "TRACER_MARKER:About to EXEC";
     static final String TEST_PREFIX     = "###TestError###: ";

     static int testExitValue = 0;

     static {
         String tmp = System.getProperty("test.classes", null);
         if (tmp == null) {
             throw new Error("property test.classes not defined ??");
         }
         TEST_CLASSES_DIR = new File(tmp).getAbsoluteFile();

         tmp = System.getProperty("test.src", null);
         if (tmp == null) {
             throw new Error("property test.src not defined ??");
         }
         TEST_SOURCES_DIR = new File(tmp).getAbsoluteFile();

         if (is64Bit && is32Bit) {
             throw new RuntimeException("arch model cannot be both 32 and 64 bit");
         }
         if (!is64Bit && !is32Bit) {
             throw new RuntimeException("arch model is not 32 or 64 bit ?");
         }
         compiler = ToolProvider.getSystemJavaCompiler();
         File binDir = (isSDK) ? new File((new File(JAVAHOME)).getParentFile(), "bin")
             : new File(JAVAHOME, "bin");
         JAVA_BIN = binDir.getAbsolutePath();
         File javaCmdFile = (isWindows)
                 ? new File(binDir, "java.exe")
                 : new File(binDir, "java");
         javaCmd = javaCmdFile.getAbsolutePath();
         if (!javaCmdFile.canExecute()) {
             throw new RuntimeException("java <" + TestHelper.javaCmd +
                     "> must exist and should be executable");
         }

         File javacCmdFile = (isWindows)
                 ? new File(binDir, "javac.exe")
                 : new File(binDir, "javac");
         javacCmd = javacCmdFile.getAbsolutePath();

         if (isWindows) {
             File javawCmdFile = new File(binDir, "javaw.exe");
             javawCmd = javawCmdFile.getAbsolutePath();
             if (!javawCmdFile.canExecute()) {
                 throw new RuntimeException("java <" + javawCmd +
                         "> must exist and should be executable");
             }
         } else {
             javawCmd = null;
         }

         if (!javacCmdFile.canExecute()) {
             throw new RuntimeException("java <" + javacCmd +
                     "> must exist and should be executable");
         }
         if (isSolaris) {
             File sparc64BinDir = new File(binDir,isSparc ? "sparcv9" : "amd64");
             File java64CmdFile= new File(sparc64BinDir, "java");
             if (java64CmdFile.exists() && java64CmdFile.canExecute()) {
                 java64Cmd = java64CmdFile.getAbsolutePath();
             } else {
                 java64Cmd = null;
             }
         } else {
             java64Cmd = null;
         }
     }

     /*
      * is a dual mode available in the test jdk
      */
     static boolean dualModePresent() {
         return isDualMode && java64Cmd != null;
     }

     /*
      * usually the jre/lib/arch-name is the same as os.arch, except for x86.
      */
     static String getJreArch() {
         String arch = System.getProperty("os.arch");
         return arch.equals("x86") ? "i386" : arch;
     }

     /*
      * get the complementary jre arch ie. if sparc then return sparcv9 and
      * vice-versa.
      */
     static String getComplementaryJreArch() {
         String arch = System.getProperty("os.arch");
         if (arch != null) {
             switch (arch) {
                 case "sparc":
                     return "sparcv9";
                 case "sparcv9":
                     return "sparc";
                 case "x86":
                     return "amd64";
                 case "amd64":
                     return "i386";
             }
         }
         return null;
     }

     /*
      * A convenience method to create a jar with jar file name and defs
      */
     static void createJar(File jarName, String... mainDefs)
             throws FileNotFoundException{
         createJar(null, jarName, new File("Foo"), mainDefs);
     }

     /*
      * A convenience method to create a java file, compile and jar it up, using
      * the sole class file name in the jar, as the Main-Class attribute value.
      */
     static void createJar(File jarName, File mainClass, String... mainDefs)
             throws FileNotFoundException {
             createJar(null, jarName, mainClass, mainDefs);
     }

     /*
      * A convenience method to compile java files.
      */
     static void compile(String... compilerArgs) {
         if (compiler.run(null, null, null, compilerArgs) != 0) {
             String sarg = "";
             for (String x : compilerArgs) {
                 sarg.concat(x + " ");
             }
             throw new Error("compilation failed: " + sarg);
         }
     }

     /*
      * A generic jar file creator to create a java file, compile it
      * and jar it up, a specific Main-Class entry name in the
      * manifest can be specified or a null to use the sole class file name
      * as the Main-Class attribute value.
      */
     static void createJar(String mEntry, File jarName, File mainClass,
             String... mainDefs) throws FileNotFoundException {
         if (jarName.exists()) {
             jarName.delete();
         }
         try (PrintStream ps = new PrintStream(new FileOutputStream(mainClass + ".java"))) {
             ps.println("public class Foo {");
             if (mainDefs != null) {
                 for (String x : mainDefs) {
                     ps.println(x);
                 }
             }
             ps.println("}");
         }

         String compileArgs[] = {
             mainClass + ".java"
         };
         if (compiler.run(null, null, null, compileArgs) != 0) {
             throw new RuntimeException("compilation failed " + mainClass + ".java");
         }
         if (mEntry == null) {
             mEntry = mainClass.getName();
         }
         String jarArgs[] = {
             (debug) ? "cvfe" : "cfe",
             jarName.getAbsolutePath(),
             mEntry,
             mainClass.getName() + ".class"
         };
         createJar(jarArgs);
     }

    static void createJar(String... args) {
         sun.tools.jar.Main jarTool =
                 new sun.tools.jar.Main(System.out, System.err, "JarCreator");
         if (!jarTool.run(args)) {
             String message = "jar creation failed with command:";
             for (String x : args) {
                 message = message.concat(" " + x);
             }
             throw new RuntimeException(message);
         }
    }

    static void copyFile(File src, File dst) throws IOException {
         Path parent = dst.toPath().getParent();
         if (parent != null) {
             Files.createDirectories(parent);
         }
         Files.copy(src.toPath(), dst.toPath(), COPY_ATTRIBUTES, REPLACE_EXISTING);
     }

     static void createFile(File outFile, List<String> content) throws IOException {
         Files.write(outFile.getAbsoluteFile().toPath(), content,
                 Charset.defaultCharset(), CREATE_NEW);
     }

     static void recursiveDelete(File target) throws IOException {
         if (!target.exists()) {
             return;
         }
         Files.walkFileTree(target.toPath(), new SimpleFileVisitor<Path>() {
             @Override
             public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
                 try {
                     Files.deleteIfExists(dir);
                 } catch (IOException ex) {
                     System.out.println("Error: could not delete: " + dir.toString());
                     System.out.println(ex.getMessage());
                     return FileVisitResult.TERMINATE;
                 }
                 return FileVisitResult.CONTINUE;
             }
             @Override
             public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
                 try {
                     Files.deleteIfExists(file);
                 } catch (IOException ex) {
                     System.out.println("Error: could not delete: " + file.toString());
                     System.out.println(ex.getMessage());
                     return FileVisitResult.TERMINATE;
                 }
                 return FileVisitResult.CONTINUE;
             }
         });
     }

     static TestResult doExec(String...cmds) {
         return doExec(null, cmds);
     }

     /*
      * A method which executes a java cmd and returns the results in a container
      */
     static TestResult doExec(Map<String, String> envToSet, String...cmds) {
         String cmdStr = "";
         for (String x : cmds) {
             cmdStr = cmdStr.concat(x + " ");
         }
         ProcessBuilder pb = new ProcessBuilder(cmds);
         Map<String, String> env = pb.environment();
         if (envToSet != null) {
             env.putAll(envToSet);
         }
         BufferedReader rdr = null;
         try {
             List<String> outputList = new ArrayList<>();
             pb.redirectErrorStream(true);
             Process p = pb.start();
             rdr = new BufferedReader(new InputStreamReader(p.getInputStream()));
             String in = rdr.readLine();
             while (in != null) {
                 outputList.add(in);
                 in = rdr.readLine();
             }
             p.waitFor();
             p.destroy();

             return new TestHelper.TestResult(cmdStr, p.exitValue(), outputList,
                     env, new Throwable("current stack of the test"));
         } catch (Exception ex) {
             ex.printStackTrace();
             throw new RuntimeException(ex.getMessage());
         }
     }

     static FileFilter createFilter(final String extension) {
         return new FileFilter() {
             @Override
             public boolean accept(File pathname) {
                 String name = pathname.getName();
                 if (name.endsWith(extension)) {
                     return true;
                 }
                 return false;
             }
         };
     }

     static boolean isEnglishLocale() {
         return Locale.getDefault().getLanguage().equals("en");
     }

     /*
      * A class to encapsulate the test results and stuff, with some ease
      * of use methods to check the test results.
      */
     static class TestResult {
         PrintWriter status;
         StringWriter sw;
         int exitValue;
         List<String> testOutput;
         Map<String, String> env;
         Throwable t;

         public TestResult(String str, int rv, List<String> oList,
                 Map<String, String> env, Throwable t) {
             sw = new StringWriter();
             status = new PrintWriter(sw);
             status.println("Executed command: " + str + "\n");
             exitValue = rv;
             testOutput = oList;
             this.env = env;
             this.t = t;
         }

         void appendError(String x) {
             status.println(TEST_PREFIX + x);
         }

         void indentStatus(String x) {
             status.println("  " + x);
         }

         void checkNegative() {
             if (exitValue == 0) {
                 appendError("test must not return 0 exit value");
                 testExitValue++;
             }
         }

         void checkPositive() {
             if (exitValue != 0) {
                 appendError("test did not return 0 exit value");
                 testExitValue++;
             }
         }

         boolean isOK() {
             return exitValue == 0;
         }

         boolean isZeroOutput() {
             if (!testOutput.isEmpty()) {
                 appendError("No message from cmd please");
                 testExitValue++;
                 return false;
             }
             return true;
         }

         boolean isNotZeroOutput() {
             if (testOutput.isEmpty()) {
                 appendError("Missing message");
                 testExitValue++;
                 return false;
             }
             return true;
         }

         @Override
         public String toString() {
             status.println("++++Begin Test Info++++");
             status.println("++++Test Environment++++");
             for (String x : env.keySet()) {
                 indentStatus(x + "=" + env.get(x));
             }
             status.println("++++Test Output++++");
             for (String x : testOutput) {
                 indentStatus(x);
             }
             status.println("++++Test Stack Trace++++");
             status.println(t.toString());
             for (StackTraceElement e : t.getStackTrace()) {
                 indentStatus(e.toString());
             }
             status.println("++++End of Test Info++++");
             status.flush();
             String out = sw.toString();
             status.close();
             return out;
         }

         boolean contains(String str) {
             for (String x : testOutput) {
                 if (x.contains(str)) {
                     return true;
                 }
             }
             appendError("string <" + str + "> not found");
             testExitValue++;
             return false;
         }

         boolean matches(String stringToMatch) {
           for (String x : testOutput) {
                 if (x.matches(stringToMatch)) {
                     return true;
                 }
             }
             appendError("string <" + stringToMatch + "> not found");
             testExitValue++;
             return false;
         }
     }
 }
	/*
	* Copyright (c) 2008, 2012, 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.io.StringWriter;
	import java.io.PrintWriter;
	import java.io.BufferedReader;
	import java.io.File;
	import java.io.FileFilter;
	import java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.PrintStream;
	import java.nio.charset.Charset;
	import java.nio.file.attribute.BasicFileAttributes;
	import java.nio.file.Files;
	import java.nio.file.FileVisitResult;
	import java.nio.file.SimpleFileVisitor;
	import java.nio.file.Path;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Locale;
	import java.util.Map;
	import javax.tools.JavaCompiler;
	import javax.tools.ToolProvider;

	import static java.nio.file.StandardCopyOption.*;
	import static java.nio.file.StandardOpenOption.*;

	/**
	* This class provides some common utilities for the launcher tests.
	*/
	public class TestHelper {
	// commonly used jtreg constants
	static final File TEST_CLASSES_DIR;
	static final File TEST_SOURCES_DIR;

	static final String JAVAHOME = System.getProperty("java.home");
	static final String JAVA_BIN;
	static final boolean isSDK = JAVAHOME.endsWith("jre");
	static final String javaCmd;
	static final String javawCmd;
	static final String java64Cmd;
	static final String javacCmd;
	static final JavaCompiler compiler;

	static final boolean debug = Boolean.getBoolean("TestHelper.Debug");
	static final boolean isWindows =
	System.getProperty("os.name", "unknown").startsWith("Windows");
	static final boolean isMacOSX =
	System.getProperty("os.name", "unknown").contains("OS X");
	static final boolean is64Bit =
	System.getProperty("sun.arch.data.model").equals("64");
	static final boolean is32Bit =
	System.getProperty("sun.arch.data.model").equals("32");
	static final boolean isSolaris =
	System.getProperty("os.name", "unknown").startsWith("SunOS");
	static final boolean isLinux =
	System.getProperty("os.name", "unknown").startsWith("Linux");
	static final boolean isDualMode = isSolaris;
	static final boolean isSparc = System.getProperty("os.arch").startsWith("sparc");

	// make a note of the golden default locale
	static final Locale DefaultLocale = Locale.getDefault();

	static final String JAVA_FILE_EXT = ".java";
	static final String CLASS_FILE_EXT = ".class";
	static final String JAR_FILE_EXT = ".jar";
	static final String EXE_FILE_EXT = ".exe";
	static final String JLDEBUG_KEY = "_JAVA_LAUNCHER_DEBUG";
	static final String EXPECTED_MARKER = "TRACER_MARKER:About to EXEC";
	static final String TEST_PREFIX = "###TestError###: ";

	static int testExitValue = 0;

	static {
	String tmp = System.getProperty("test.classes", null);
	if (tmp == null) {
	throw new Error("property test.classes not defined ??");
	}
	TEST_CLASSES_DIR = new File(tmp).getAbsoluteFile();

	tmp = System.getProperty("test.src", null);
	if (tmp == null) {
	throw new Error("property test.src not defined ??");
	}
	TEST_SOURCES_DIR = new File(tmp).getAbsoluteFile();

	if (is64Bit && is32Bit) {
	throw new RuntimeException("arch model cannot be both 32 and 64 bit");
	}
	if (!is64Bit && !is32Bit) {
	throw new RuntimeException("arch model is not 32 or 64 bit ?");
	}
	compiler = ToolProvider.getSystemJavaCompiler();
	File binDir = (isSDK) ? new File((new File(JAVAHOME)).getParentFile(), "bin")
	: new File(JAVAHOME, "bin");
	JAVA_BIN = binDir.getAbsolutePath();
	File javaCmdFile = (isWindows)
	? new File(binDir, "java.exe")
	: new File(binDir, "java");
	javaCmd = javaCmdFile.getAbsolutePath();
	if (!javaCmdFile.canExecute()) {
	throw new RuntimeException("java <" + TestHelper.javaCmd +
	"> must exist and should be executable");
	}

	File javacCmdFile = (isWindows)
	? new File(binDir, "javac.exe")
	: new File(binDir, "javac");
	javacCmd = javacCmdFile.getAbsolutePath();

	if (isWindows) {
	File javawCmdFile = new File(binDir, "javaw.exe");
	javawCmd = javawCmdFile.getAbsolutePath();
	if (!javawCmdFile.canExecute()) {
	throw new RuntimeException("java <" + javawCmd +
	"> must exist and should be executable");
	}
	} else {
	javawCmd = null;
	}

	if (!javacCmdFile.canExecute()) {
	throw new RuntimeException("java <" + javacCmd +
	"> must exist and should be executable");
	}
	if (isSolaris) {
	File sparc64BinDir = new File(binDir,isSparc ? "sparcv9" : "amd64");
	File java64CmdFile= new File(sparc64BinDir, "java");
	if (java64CmdFile.exists() && java64CmdFile.canExecute()) {
	java64Cmd = java64CmdFile.getAbsolutePath();
	} else {
	java64Cmd = null;
	}
	} else {
	java64Cmd = null;
	}
	}

	/*
	* is a dual mode available in the test jdk
	*/
	static boolean dualModePresent() {
	return isDualMode && java64Cmd != null;
	}

	/*
	* usually the jre/lib/arch-name is the same as os.arch, except for x86.
	*/
	static String getJreArch() {
	String arch = System.getProperty("os.arch");
	return arch.equals("x86") ? "i386" : arch;
	}

	/*
	* get the complementary jre arch ie. if sparc then return sparcv9 and
	* vice-versa.
	*/
	static String getComplementaryJreArch() {
	String arch = System.getProperty("os.arch");
	if (arch != null) {
	switch (arch) {
	case "sparc":
	return "sparcv9";
	case "sparcv9":
	return "sparc";
	case "x86":
	return "amd64";
	case "amd64":
	return "i386";
	}
	}
	return null;
	}

	/*
	* A convenience method to create a jar with jar file name and defs
	*/
	static void createJar(File jarName, String... mainDefs)
	throws FileNotFoundException{
	createJar(null, jarName, new File("Foo"), mainDefs);
	}

	/*
	* A convenience method to create a java file, compile and jar it up, using
	* the sole class file name in the jar, as the Main-Class attribute value.
	*/
	static void createJar(File jarName, File mainClass, String... mainDefs)
	throws FileNotFoundException {
	createJar(null, jarName, mainClass, mainDefs);
	}

	/*
	* A convenience method to compile java files.
	*/
	static void compile(String... compilerArgs) {
	if (compiler.run(null, null, null, compilerArgs) != 0) {
	String sarg = "";
	for (String x : compilerArgs) {
	sarg.concat(x + " ");
	}
	throw new Error("compilation failed: " + sarg);
	}
	}

	/*
	* A generic jar file creator to create a java file, compile it
	* and jar it up, a specific Main-Class entry name in the
	* manifest can be specified or a null to use the sole class file name
	* as the Main-Class attribute value.
	*/
	static void createJar(String mEntry, File jarName, File mainClass,
	String... mainDefs) throws FileNotFoundException {
	if (jarName.exists()) {
	jarName.delete();
	}
	try (PrintStream ps = new PrintStream(new FileOutputStream(mainClass + ".java"))) {
	ps.println("public class Foo {");
	if (mainDefs != null) {
	for (String x : mainDefs) {
	ps.println(x);
	}
	}
	ps.println("}");
	}

	String compileArgs[] = {
	mainClass + ".java"
	};
	if (compiler.run(null, null, null, compileArgs) != 0) {
	throw new RuntimeException("compilation failed " + mainClass + ".java");
	}
	if (mEntry == null) {
	mEntry = mainClass.getName();
	}
	String jarArgs[] = {
	(debug) ? "cvfe" : "cfe",
	jarName.getAbsolutePath(),
	mEntry,
	mainClass.getName() + ".class"
	};
	createJar(jarArgs);
	}

	static void createJar(String... args) {
	sun.tools.jar.Main jarTool =
	new sun.tools.jar.Main(System.out, System.err, "JarCreator");
	if (!jarTool.run(args)) {
	String message = "jar creation failed with command:";
	for (String x : args) {
	message = message.concat(" " + x);
	}
	throw new RuntimeException(message);
	}
	}

	static void copyFile(File src, File dst) throws IOException {
	Path parent = dst.toPath().getParent();
	if (parent != null) {
	Files.createDirectories(parent);
	}
	Files.copy(src.toPath(), dst.toPath(), COPY_ATTRIBUTES, REPLACE_EXISTING);
	}

	static void createFile(File outFile, List<String> content) throws IOException {
	Files.write(outFile.getAbsoluteFile().toPath(), content,
	Charset.defaultCharset(), CREATE_NEW);
	}

	static void recursiveDelete(File target) throws IOException {
	if (!target.exists()) {
	return;
	}
	Files.walkFileTree(target.toPath(), new SimpleFileVisitor<Path>() {
	@Override
	public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
	try {
	Files.deleteIfExists(dir);
	} catch (IOException ex) {
	System.out.println("Error: could not delete: " + dir.toString());
	System.out.println(ex.getMessage());
	return FileVisitResult.TERMINATE;
	}
	return FileVisitResult.CONTINUE;
	}
	@Override
	public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
	try {
	Files.deleteIfExists(file);
	} catch (IOException ex) {
	System.out.println("Error: could not delete: " + file.toString());
	System.out.println(ex.getMessage());
	return FileVisitResult.TERMINATE;
	}
	return FileVisitResult.CONTINUE;
	}
	});
	}

	static TestResult doExec(String...cmds) {
	return doExec(null, cmds);
	}

	/*
	* A method which executes a java cmd and returns the results in a container
	*/
	static TestResult doExec(Map<String, String> envToSet, String...cmds) {
	String cmdStr = "";
	for (String x : cmds) {
	cmdStr = cmdStr.concat(x + " ");
	}
	ProcessBuilder pb = new ProcessBuilder(cmds);
	Map<String, String> env = pb.environment();
	if (envToSet != null) {
	env.putAll(envToSet);
	}
	BufferedReader rdr = null;
	try {
	List<String> outputList = new ArrayList<>();
	pb.redirectErrorStream(true);
	Process p = pb.start();
	rdr = new BufferedReader(new InputStreamReader(p.getInputStream()));
	String in = rdr.readLine();
	while (in != null) {
	outputList.add(in);
	in = rdr.readLine();
	}
	p.waitFor();
	p.destroy();

	return new TestHelper.TestResult(cmdStr, p.exitValue(), outputList,
	env, new Throwable("current stack of the test"));
	} catch (Exception ex) {
	ex.printStackTrace();
	throw new RuntimeException(ex.getMessage());
	}
	}

	static FileFilter createFilter(final String extension) {
	return new FileFilter() {
	@Override
	public boolean accept(File pathname) {
	String name = pathname.getName();
	if (name.endsWith(extension)) {
	return true;
	}
	return false;
	}
	};
	}

	static boolean isEnglishLocale() {
	return Locale.getDefault().getLanguage().equals("en");
	}

	/*
	* A class to encapsulate the test results and stuff, with some ease
	* of use methods to check the test results.
	*/
	static class TestResult {
	PrintWriter status;
	StringWriter sw;
	int exitValue;
	List<String> testOutput;
	Map<String, String> env;
	Throwable t;

	public TestResult(String str, int rv, List<String> oList,
	Map<String, String> env, Throwable t) {
	sw = new StringWriter();
	status = new PrintWriter(sw);
	status.println("Executed command: " + str + "\n");
	exitValue = rv;
	testOutput = oList;
	this.env = env;
	this.t = t;
	}

	void appendError(String x) {
	status.println(TEST_PREFIX + x);
	}

	void indentStatus(String x) {
	status.println(" " + x);
	}

	void checkNegative() {
	if (exitValue == 0) {
	appendError("test must not return 0 exit value");
	testExitValue++;
	}
	}

	void checkPositive() {
	if (exitValue != 0) {
	appendError("test did not return 0 exit value");
	testExitValue++;
	}
	}

	boolean isOK() {
	return exitValue == 0;
	}

	boolean isZeroOutput() {
	if (!testOutput.isEmpty()) {
	appendError("No message from cmd please");
	testExitValue++;
	return false;
	}
	return true;
	}

	boolean isNotZeroOutput() {
	if (testOutput.isEmpty()) {
	appendError("Missing message");
	testExitValue++;
	return false;
	}
	return true;
	}

	@Override
	public String toString() {
	status.println("++++Begin Test Info++++");
	status.println("++++Test Environment++++");
	for (String x : env.keySet()) {
	indentStatus(x + "=" + env.get(x));
	}
	status.println("++++Test Output++++");
	for (String x : testOutput) {
	indentStatus(x);
	}
	status.println("++++Test Stack Trace++++");
	status.println(t.toString());
	for (StackTraceElement e : t.getStackTrace()) {
	indentStatus(e.toString());
	}
	status.println("++++End of Test Info++++");
	status.flush();
	String out = sw.toString();
	status.close();
	return out;
	}

	boolean contains(String str) {
	for (String x : testOutput) {
	if (x.contains(str)) {
	return true;
	}
	}
	appendError("string <" + str + "> not found");
	testExitValue++;
	return false;
	}

	boolean matches(String stringToMatch) {
	for (String x : testOutput) {
	if (x.matches(stringToMatch)) {
	return true;
	}
	}
	appendError("string <" + stringToMatch + "> not found");
	testExitValue++;
	return false;
	}
	}
	}