[PATCH] test suite: add a check that all test numbers are unique

[Johannes Sixt <j.sixt@viscovery.net>]

From: Johannes Sixt <j6t@kdbg.org>

The test runs only if 'make all' is used. Its purpose is to alert our
valued integrator if different branches are merged that happen to
introduce the same test number.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
---
 t/Makefile                |    1 +
 t/check_unique_numbers.sh |   27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)
 create mode 100755 t/check_unique_numbers.sh

diff --git a/t/Makefile b/t/Makefile
index bd09390..2a451b7 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -17,6 +17,7 @@ T = $(wildcard t[0-9][0-9][0-9][0-9]-*.sh)
 TSVN = $(wildcard t91[0-9][0-9]-*.sh)

 all: pre-clean
+	'$(SHELL_PATH_SQ)' ./check_unique_numbers.sh
 	$(MAKE) aggregate-results-and-cleanup

 $(T):
diff --git a/t/check_unique_numbers.sh b/t/check_unique_numbers.sh
new file mode 100755
index 0000000..e767275
--- /dev/null
+++ b/t/check_unique_numbers.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+# checks whether test case numbers are unique;
+# returns non-zero if any duplicates were found
+
+check_numbers () {
+	last= dup=
+	while read name
+	do
+		case $name in
+		t[0-9][0-9][0-9][0-9]-*.sh)
+			number=${name%%-*}
+			if test "$number" = "$last"; then
+				dup="$dup $number"
+			fi
+			last=$number
+			;;
+		esac
+	done
+	test -z "$dup" || {
+		echo >&2 "error: duplicate test numbers:" $dup
+		return 1
+	}
+}
+
+ls -1 |	# no wildcard to avoid overflow of command line
+check_numbers
-- 
1.6.4.204.g6aad7