Merge branch 'cp/unit-test-reftable-readwrite'

* cp/unit-test-reftable-readwrite:
  t-reftable-readwrite: add test for known error
  t-reftable-readwrite: use 'for' in place of infinite 'while' loops
  t-reftable-readwrite: use free_names() instead of a for loop
  t: move reftable/readwrite_test.c to the unit testing framework

t/helper/test-reftable.c

@@ -6,7 +6,6 @@ int cmd__reftable(int argc, const char **argv)
 {
 	/* test from simple to complex. */
 	block_test_main(argc, argv);
-	readwrite_test_main(argc, argv);
 	stack_test_main(argc, argv);
 	return 0;
 }