[gnome-control-center] build: Add GTest Makefile snippet

[Bastien Nocera <hadess src gnome org>]

commit d18411dbe25bea7f71408dbffb20845e363bd158
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Jun 10 14:32:11 2016 +0200

    build: Add GTest Makefile snippet

 Makefile.decl |   53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.decl b/Makefile.decl
new file mode 100644
index 0000000..aab33c3
--- /dev/null
+++ b/Makefile.decl
@@ -0,0 +1,53 @@
+GTESTER        = gtester               # in $PATH for non-GLIB packages
+GTESTER_REPORT = gtester-report                # in $PATH for non-GLIB packages
+
+# initialize variables for unconditional += appending
+TEST_PROGS =
+
+# test: run all tests in cwd and subdirs
+test:  ${TEST_PROGS}
+       @test -z "${TEST_PROGS}" || ${GTESTER} --verbose ${TEST_PROGS}
+       @ for subdir in $(SUBDIRS) . ; do \
+           test "$$subdir" = "." -o "$$subdir" = "po" || \
+           ( cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) $@ ) || exit $? ; \
+         done
+
+# test-report: run tests in subdirs and generate report
+# perf-report: run tests in subdirs with -m perf and generate report
+# full-report: like test-report: with -m perf and -m slow
+test-report perf-report full-report:   ${TEST_PROGS}
+       @test -z "${TEST_PROGS}" || { \
+         case $@ in \
+         test-report) test_options="-k";; \
+         perf-report) test_options="-k -m=perf";; \
+         full-report) test_options="-k -m=perf -m=slow";; \
+         esac ; \
+         if test -z "$$GTESTER_LOGDIR" ; then  \
+           ${GTESTER} --verbose $$test_options -o test-report.xml ${TEST_PROGS} ; \
+         elif test -n "${TEST_PROGS}" ; then \
+           ${GTESTER} --verbose $$test_options -o `mktemp "$$GTESTER_LOGDIR/log-XXXXXX"` ${TEST_PROGS} ; \
+         fi ; \
+       }
+       @ ignore_logdir=true ; \
+         if test -z "$$GTESTER_LOGDIR" ; then \
+           GTESTER_LOGDIR=`mktemp -d "\`pwd\`/.testlogs-XXXXXX"`; export GTESTER_LOGDIR ; \
+           ignore_logdir=false ; \
+         fi ; \
+         for subdir in $(SUBDIRS) . ; do \
+           test "$$subdir" = "." -o "$$subdir" = "po" || \
+           ( cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) $@ ) || exit $? ; \
+         done ; \
+         $$ignore_logdir || { \
+           echo '<?xml version="1.0"?>' > $  xml ; \
+           echo '<report-collection>'  >> $  xml ; \
+           for lf in `ls -L "$$GTESTER_LOGDIR"/.` ; do \
+             sed '1,1s/^<?xml\b[^>?]*?>//' <"$$GTESTER_LOGDIR"/"$$lf" >> $  xml ; \
+           done ; \
+           echo >> $  xml ; \
+           echo '</report-collection>' >> $  xml ; \
+           rm -rf "$$GTESTER_LOGDIR"/ ; \
+           ${GTESTER_REPORT} --version 2>/dev/null 1>&2 ; test "$$?" != 0 || ${GTESTER_REPORT} $  xml >$  
html ; \
+         }
+.PHONY: test test-report perf-report full-report
+# run make test as part of make check
+check-local: test