[RFC/PATCH 1/2] test git version string

The git version string is used in the wild, and in git gui,
for capability checking purposes. Test the string format
and version X.Y.Z number.

The version string shall be:
* a single line
* less that 80 characters
* start with `git version `
* with a following numeric X.Y.Z version.

The remaining characters are undefined.

Signed-off-by: Philip Oakley <redacted>
---

Should this be applied to t0000, or another test file?
Should the version string be always limited to one line?
Should the maximum string length be <80 characters?
Is egrep OK, or should I use grep with a longer BRE?

 t/t0000-basic.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index cefe33d..052afca 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh

@@ -610,4 +610,12 @@ test_expect_success 'very long name in the index handled sanely' '
 	test $len = 4098
 '
 
+test_expect_success 'git version string X.Y.Z' '
+	git --version >verstring &&
+	test_line_count =  1 verstring &&
+	len=$(wc -c verstring | sed "s/[^0-9]//g") &&
+	test $len -lt  80 &&
+	egrep -q "^git version [0-9]+\.[0-9]+\.[0-9]+.*" verstring
+'
+
 test_done

-- 
1.8.1.msysgit.1