Package org.apache.flink.core.testutils

Class CommonTestUtils

java.lang.Object

org.apache.flink.core.testutils.CommonTestUtils

public class CommonTestUtils
extends Object

This class contains reusable utility methods for unit tests.

Constructor Summary

Constructors

Constructor	Description
CommonTestUtils()

Method Summary

Modifier and Type	Method	Description
static void	assertThrows(String msg, Class<? extends Exception> expected, Callable<?> code)	Checks whether an exception with a message occurs when running a piece of code.
static void	blockForeverNonInterruptibly()	Permanently blocks the current thread.
static boolean	containsCause(Throwable throwable, Class<? extends Throwable> cause)	Checks whether the given throwable contains the given cause as a cause.
static <T extends Serializable> T	createCopySerializable(T original)	Creates a copy of an object via Java Serialization.
static String	createTempFile(String contents)	Creates a temporary file that contains the given string.
static void	setEnv(Map<String,String> newenv)
static void	setEnv(Map<String,String> newenv, boolean clearExisting)
static void	waitUtil(java.util.function.Supplier<Boolean> condition, java.time.Duration timeout, String errorMsg)	Wait util the given condition is met or timeout.
static void	waitUtil(java.util.function.Supplier<Boolean> condition, java.time.Duration timeout, java.time.Duration pause, String errorMsg)	Wait util the given condition is met or timeout.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CommonTestUtils

public CommonTestUtils()

Method Detail

createCopySerializable

public static <T extends Serializable> T createCopySerializable(T original)
                                                         throws IOException

Creates a copy of an object via Java Serialization.

Parameters:

original - The original object.

Returns:

The copied object.

Throws:

IOException

createTempFile

public static String createTempFile(String contents)
                             throws IOException

Creates a temporary file that contains the given string. The file is written with the platform's default encoding.

The temp file is automatically deleted on JVM exit.

Parameters:

contents - The contents to be written to the file.

Returns:

The temp file URI.

Throws:

IOException

blockForeverNonInterruptibly

public static void blockForeverNonInterruptibly()

Permanently blocks the current thread. The thread cannot be woken up via Thread.interrupt().

setEnv

public static void setEnv(Map<String,String> newenv)

setEnv

public static void setEnv(Map<String,String> newenv,
                          boolean clearExisting)

containsCause

public static boolean containsCause(Throwable throwable,
                                    Class<? extends Throwable> cause)

Checks whether the given throwable contains the given cause as a cause. The cause is not checked on equality but on type equality.

Parameters:

throwable - Throwable to check for the cause

cause - Cause to look for

Returns:

True if the given Throwable contains the given cause (type equality); otherwise false

assertThrows

public static void assertThrows(String msg,
                                Class<? extends Exception> expected,
                                Callable<?> code)

Checks whether an exception with a message occurs when running a piece of code.

waitUtil

public static void waitUtil(java.util.function.Supplier<Boolean> condition,
                            java.time.Duration timeout,
                            java.time.Duration pause,
                            String errorMsg)
                     throws TimeoutException,
                            InterruptedException

Wait util the given condition is met or timeout.

Parameters:

condition - the condition to wait for.

timeout - the maximum time to wait for the condition to become true.

pause - delay between condition checks.

errorMsg - the error message to include in the TimeoutException if the condition was not met before timeout.

Throws:

TimeoutException - if the condition is not met before timeout.

InterruptedException - if the thread is interrupted.

waitUtil

public static void waitUtil(java.util.function.Supplier<Boolean> condition,
                            java.time.Duration timeout,
                            String errorMsg)
                     throws TimeoutException,
                            InterruptedException

Wait util the given condition is met or timeout.

Parameters:

condition - the condition to wait for.

timeout - the maximum time to wait for the condition to become true.

errorMsg - the error message to include in the TimeoutException if the condition was not met before timeout.

Throws:

TimeoutException - if the condition is not met before timeout.

InterruptedException - if the thread is interrupted.