Concurrency issues at AboutCodeFragments, koan 1, test 3

[anatoliykmetyuk]

This test fails from time to time non-deterministically:

[info] AboutCodeFragments:
[info] - Koan 1 *** FAILED ***
[info]   Test 3: 101 was not equal to 201 (KoanSuite.scala:122)

This code:

        q  = {* i=1; Thread.sleep(200); i+=100 *} // 200 ms is enough to "trust" in interleaving

is executed in parallel:

        s3 = reset;  q & q

So here we have two Java threads doing non-atomic operations on the i variable concurrently.