Provide test cases for readtabs-combine

Tmain/readtags-combine.d/backward.tags

@@ -0,0 +1,8 @@
+!_TAG_FILE_FORMAT	2	/extended format; --format=1 will not append ;" to lines/
+!_TAG_FILE_SORTED	1	/0=unsorted, 1=sorted, 2=foldcase/
+!_TAG_OUTPUT_MODE	u-ctags	/u-ctags or e-ctags/
+!_TAG_PROGRAM_AUTHOR	Universal Ctags Team	//
+!_TAG_PROGRAM_NAME	Universal Ctags	/Derived from Exuberant Ctags/
+!_TAG_PROGRAM_URL	https://ctags.io/	/official site/
+!_TAG_PROGRAM_VERSION	0.0.0	/6e3f1aa1/
+foo	input.c	2;?^int foo (void)$?;"	f	typeref:typename:int

Tmain/readtags-combine.d/exit-expected.txt

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+0

Tmain/readtags-combine.d/forward.tags

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+!_TAG_FILE_FORMAT	2	/extended format; --format=1 will not append ;" to lines/
+!_TAG_FILE_SORTED	1	/0=unsorted, 1=sorted, 2=foldcase/
+!_TAG_OUTPUT_MODE	u-ctags	/u-ctags or e-ctags/
+!_TAG_PROGRAM_AUTHOR	Universal Ctags Team	//
+!_TAG_PROGRAM_NAME	Universal Ctags	/Derived from Exuberant Ctags/
+!_TAG_PROGRAM_URL	https://ctags.io/	/official site/
+!_TAG_PROGRAM_VERSION	0.0.0	/6e3f1aa1/
+foo	input.c	0;/^int foo (void)$/;"	f	typeref:typename:int

Tmain/readtags-combine.d/run.sh

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+#!/bin/sh
+
+# Copyright: 2019 CCI Europe. Author: Claus Moltke-Leth
+# License: GPL-2
+
+READTAGS=$3
+
+. ../utils.sh
+
+#V="valgrind --leak-check=full -v"
+V=
+
+if ! [ -x "${READTAGS}" ]; then
+	skip "no readtags"
+fi
+
+${V} ${READTAGS} -e -t forward.tags -l &&
+${V} ${READTAGS} -e -t backward.tags -l

Tmain/readtags-combine.d/stdout-expected.txt

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+foo	input.c	0;/^int foo (void)$/;"	kind:f	typeref:typename:int
+foo	input.c	2;?^int foo (void)$?;"	kind:f	typeref:typename:int