git-credential-netrc: adapt to test framework for git

git-credential-netrc tests did not run in a test repository.
Reuse the main test framework to stage a temporary repository.
To imitate Perl tests under t/
- switch to Test::More module
- use File::Basename & File::Spec::Functions

Signed-off-by: Luis Marsano <luis.marsano@gmail.com>
Acked-by: Ted Zlatanov <tzz@lifelogs.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/credential/netrc/t-git-credential-netrc.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+(
+	cd ../../../t
+	test_description='git-credential-netrc'
+	. ./test-lib.sh
+
+	if ! test_have_prereq PERL; then
+		skip_all='skipping perl interface tests, perl not available'
+		test_done
+	fi
+
+	perl -MTest::More -e 0 2>/dev/null || {
+		skip_all="Perl Test::More unavailable, skipping test"
+		test_done
+	}
+
+	# set up test repository
+
+	test_expect_success \
+    'set up test repository' \
+    :
+
+	# The external test will outputs its own plan
+	test_external_has_tap=1
+
+	test_external \
+    'git-credential-netrc' \
+    perl "$TEST_DIRECTORY"/../contrib/credential/netrc/test.pl
+
+	test_done
+)