Hide useless test output
Do not use delimiters when no values are saved
Test no longer use pipes, skip -o pipefail
Display diff in test logs
Add another test

This test inserts thousand random strings into the trie a then retrieves
them.
Add another fuzzing test

Insert one key into the trie, then try to lookup many random keys, none
of which must be found.
Increase number of tests in test 4
Add test with very long data
Add test with lots of keys