sort: -z outputs NUL terminated lines. Closes bug 1591.

testsuite/README

@@ -1,6 +1,3 @@
-Update: doesn't work as described. Try "make check" from parent dir...
-* * *
-
 To run the test suite, change to this directory and run "./runtest".  It will
 run all of the test cases, and list those with unexpected outcomes.  Adding the
 -v option will cause it to show expected outcomes as well.  To only run the test

testsuite/runtest

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# Usage:
+# runtest [applet1] [applet2...]
+
 # Run one old-style test.
 # Tests are stored in applet/testcase shell scripts.
 # They are run using "sh -x -e applet/testcase".

testsuite/sort.tests

@@ -107,6 +107,12 @@ a c
 b c
 " ""
 
+testing "sort -z outputs NUL terminated lines" "sort -z input" "\
+one\0three\0two\0\
+" "\
+one\0two\0three\0\
+" ""
+
 testing "sort key doesn't strip leading blanks, disables fallback global sort" \
 "sort -n -k2 -t ' '" " a \n 1 \n 2 \n" "" " 2 \n 1 \n a \n"