add test to cover deque::erase(iter, iter) and avoiding self-move-assigns #1203
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Followed by the Issue #1176 I've modified the test to cover the fixed issue #1118
The previous test case test
deque::erase(begin, begin)
did not test self-assignment. Because in that special case the issue mentioned in #1118 wasn't happening. I've changed it toerase(begin+1, begin+1)
which now actually can test for avoiding self-assignment.however, I wasn't sure that should I just modify the test case or add a new test block?