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[PATCH 2/2] t/lib-git-svn.sh: improve svnserve tests with parallel make test

Previously, setting SVNSERVE_PORT enabled several tests which require a
local svnserve daemon to be run (in t9113 & t9126).  The tests share the
setup of the local svnserve via `start_svnserve()`.  The function uses
the svnserve option `--listen-once` which causes svnserve to accept one
connection on the port, serve it, and exit.  When running the tests in
parallel this fails if one test tries to start svnserve while the other
is still running.

Use the test number as the svnserve port (similar to httpd tests) to
avoid port conflicts.  Set GIT_TEST_SVNSERVE to any value other than
'false' or 'auto' to enable these tests.

Signed-off-by: Todd Zullinger <tmz@xxxxxxxxx>
 t/lib-git-svn.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/t/lib-git-svn.sh b/t/lib-git-svn.sh
index 84366b2624..4c1f81f167 100644
--- a/t/lib-git-svn.sh
+++ b/t/lib-git-svn.sh
@@ -110,14 +110,16 @@ EOF
 require_svnserve () {
-	if test -z "$SVNSERVE_PORT"
+	test_tristate GIT_TEST_SVNSERVE
+	if ! test "$GIT_TEST_SVNSERVE" = true
-		skip_all='skipping svnserve test. (set $SVNSERVE_PORT to enable)'
+		skip_all='skipping svnserve test. (set $GIT_TEST_SVNSERVE to enable)'
 start_svnserve () {
 	svnserve --listen-port $SVNSERVE_PORT \
 		 --root "$rawsvnrepo" \
 		 --listen-once \