testing: improve test coverage DequeTest
#6429
Open
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Adding additional tests for next cases:
Multiple consecutive additions to front (addFirst) and back (addLast)
Verification that elements maintain proper order and positioning
Single element operations from both ends (front and back polling)
Ensures proper state transitions from single element to empty
Mixed null and non-null string values
Proper handling of null elements in various positions
Validates that addFirst/pollFirst and addLast/pollLast operations work symmetrically
Ensures deque maintains consistent state after paired operations
clang-format -i --style=file path/to/your/file.java