test: remove a porcelain test that hard-codes commit names

The rev-list output in this test depends on the details of test_tick's
dummy dates and the choice of hash function.  Worse, it depends on the
order and nature of commits made in the earlier tests, so adding new
tests or rearranging existing ones breaks it.

It would be nice to check that "git commit" and commit-tree name
objects consistently and that commit objects' text is as documented,
but this particular test checks everything at once and hence is not a
robust test for that.  Remove it.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7501-commit.sh

@@ -144,10 +144,6 @@ test_expect_success PERL \
 	git diff >diff2 &&
 	test_cmp diff1 diff2"
 
-test_expect_success \
-	"showing committed revisions" \
-	"git rev-list HEAD >current"
-
 cat >editor <<\EOF
 #!/bin/sh
 sed -e "s/good/bad/g" < "$1" > "$1-"
@@ -168,22 +164,6 @@ test_expect_success \
 	 echo "Another good message." | EDITOR=./editor git commit -a -F - &&
 	 git show -s --pretty=format:"%s" | grep -q good
 	 '
-# We could just check the head sha1, but checking each commit makes it
-# easier to isolate bugs.
-
-cat >expected <<\EOF
-285fcf7ec0d61b14249dfdb4c1e1fe03eaf15ee0
-0b8148b9afce917b87d71199b900466dc8ea8b6e
-43fb8826314939ce79a856face7953557fdca3d1
-eaa04bc3ae0f0b003f7f1d86bf869ec5d73eaf3e
-ee1963b250ee0f02a3fe37be0e4a02bb5af6a1ad
-b49f306003c627361a0304d151a6b4c8b26af6a1
-402702b49136e7587daa9280e91e4bb7cb2179f7
-EOF
-
-test_expect_success \
-    'validate git rev-list output.' \
-    'test_cmp expected current'
 
 test_expect_success 'partial commit that involves removal (1)' '