mktag tests: don't create "mytag" twice

Change a test added in e0aaf78 (mktag.c: improve verification of
tagger field and tests, 2008-03-27) to not create "mytag", which
should only be created and verified at the end in an earlier test
added in 446c6fa (New tests and en-passant modifications to mktag.,
2006-07-29).

While we're at it let's prevent a similar logic error from creeping
into the test by asserting that "mytag" doesn't exist before we create
it. Let's do this by moving the test to use "update-ref", instead of
our own homebrew ad-hoc refstore update.

We're not really testing for anything yet by creating the tag at the
end here. A subsequent commit will change that.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

t/t3800-mktag.sh

@@ -222,7 +222,7 @@ EOF
 
 test_expect_success \
     'allow empty tag email' \
-    'git mktag <tag.sig >.git/refs/tags/mytag'
+    'git mktag <tag.sig'
 
 ############################################################
 # 16. disallow spaces in tag email
@@ -348,16 +348,9 @@ tagger T A Gger <[email protected]> 1206478233 -0500
 
 EOF
 
-test_expect_success \
-    'create valid tag' \
-    'git mktag <tag.sig >.git/refs/tags/mytag'
-
-############################################################
-# 25. check mytag
-
-test_expect_success \
-    'check mytag' \
-    'git tag -l | grep mytag'
-
+test_expect_success 'create valid tag' '
+	git mktag <tag.sig >hash &&
+	git update-ref refs/tags/mytag $(cat hash) $(test_oid zero)
+'
 
 test_done