[PATCH v2 1/4] t1517: skip svn tests if svn is not installed

["brian m. carlson" <sandals@crustytoothpaste.net>]

The svn tests currently assume that git-svn's option parsing will always
fail the tests because it exits 0 on --help, not 129.  However, in a
future commit, we'll expect it to exit 0 and the tests will then need to
be updated to succeed in some cases and fail in others.

We therefore need to have t1517 determine whether the Subversion Perl
modules are present, since if they are not, git-svn will die on start
and then it needs to continue to expect failure.  Add a stripped down
version of the tests in t/lib-git-svn.sh as a prerequisite we can use
here for our svn tests.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 t/t1517-outside-repo.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/t/t1517-outside-repo.sh b/t/t1517-outside-repo.sh
index c557f2f55c..583784f21b 100755
--- a/t/t1517-outside-repo.sh
+++ b/t/t1517-outside-repo.sh
@@ -4,6 +4,14 @@ test_description='check random commands outside repo'
 
 . ./test-lib.sh
 
+test_lazy_prereq SVN '
+	test_have_prereq PERL && test -n "$NO_SVN_TESTS" && perl -w -e "
+		use SVN::Core;
+		use SVN::Repos;
+		\$SVN::Core::VERSION gt '1.1.0' or exit(42);
+	"
+'
+
 test_expect_success 'set up a non-repo directory and test file' '
 	GIT_CEILING_DIRECTORIES=$(pwd) &&
 	export GIT_CEILING_DIRECTORIES &&
@@ -138,6 +146,8 @@ do
 	case "$cmd" in
 	instaweb)
 		prereq=PERL ;;
+	svn)
+		prereq=SVN ;;
 	*)
 		prereq= ;;
 	esac