[SR-13610] Test passes on macOS and crashes (not fails) on Linux

[swift-ci]

Previous ID	SR-13610
Radar	rdar://problem/69574788
Original Reporter	PawelMadej (JIRA User)
Type	Bug

Environment

Ubuntu Linux 18.04

Swift 5.2.4 and 5.3

Additional Detail from JIRA

Votes	0
Component/s	XCTest
Labels	Bug
Assignee	None
Priority	Medium

md5: 6f2d5ddf55e814cc0d06308ed989de6c

Issue Description:

Steps to reproduce:

1. clone this repo on linux http://github.com/nysander/twitter-text branch main

2. run

swift test --enable-test-discovery --filter "testExtract"

test will crash

Test Suite 'Selected tests' started at 2020-09-25 15:13:32.087
Test Suite 'TwitterTextTests' started at 2020-09-25 15:13:32.090
Test Case 'TwitterTextTests.testExtract' started at 2020-09-25 15:13:32.090
free(): invalid pointer
Exited with signal code 6

3. checkout branch main

replace line:https://github.com/nysander/twitter-text/blob/011711c6a34af351d83eed143d094fe67d5109ef/Tests/TwitterTextTests/TwitterTextTests.swift#L268

with

var counter = 0
for testCase in urls {
    counter += 1
    print(counter)
// rest without change

4. run test again - test passes

[typesanitizer]

@swift-ci create

[swift-ci]

Comment by Paweł Madej (JIRA)

edited 2 steps because they were wrong. above flow describes fully bug