+set PATH for convenience:
+
+ $ [ -n "$TEST_CRC32" ] && export PATH="$(dirname "$TEST_CRC32"):$PATH"
+ $ alias test-crc32='valgrind --quiet --leak-check=full test-crc32'
+
+check that crc32 is producing expected results:
+
+ $ test-crc32
+ all_ffs=0x44f33105
+ all_7fs=0x3726dda7
+ all_ones=0xbea1dbe8
+ all_zeroes=0xa77a69f2
+ quick_fox=0x7c7180f2