/usr/lib/mysql-testsuite/include/endspace.inc is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | select 'a' = 'a', 'a' = 'a ', 'a ' = 'a';
select 'a\0' = 'a', 'a\0' < 'a', 'a\0' > 'a';
select 'a' = 'a\0', 'a' < 'a\0', 'a' > 'a\0';
select 'a\0' = 'a ', 'a\0' < 'a ', 'a\0' > 'a ';
select 'a ' = 'a\0', 'a ' < 'a\0', 'a ' > 'a\0';
select 'a a' > 'a', 'a \0' < 'a';
select binary 'a a' > 'a', binary 'a \0' > 'a', binary 'a\0' > 'a';
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