[Feature] memory bounded test

[augustindelecluse]

Problem

Some tests might use a large amount of memory, for instance for checking a DP model. With a wrong implementation, some students might explore too many states, filling up the memory of their machine or of a grading system.

Solution

Provide an annotation @MemoryLimit, where the test fails whenever the memory consumption is too high.
Example of usage:

@Test
@MemoryLimit(value = 200, units = MB)
public void test1() {
    infiniteDFS();
}

The test should fail with something similar to a MemoryConsumptionError

Ways for implementation

assertTimeoutPreemtively allows to kill a thread if its execution is above a given timed threshold. The mechanism could be use here, killing the thread if the memory consumption is too high. See

• https://github.com/frohoff/jdk8u-jdk/blob/master/src/share/classes/java/util/concurrent/CompletableFuture.java#L1652 to create a Future<T>-like class, with a method get() killing the thread if the memory consumption is too high
• Precise memory consumption of a thread is hard to do in Java. See here for an example of how to measure memory at the JVM level.