t9350: make hash size independent

This test checks for several commit object sizes to verify that objects
are encoded as expected. However, the size of a commit object differs
between SHA-1 and SHA-256, since each contains a hex representation of
the tree's object ID. Since these are root commits, compute the size of
each commit by using a constant plus the size of a single hex object ID.

In addition, use $ZERO_OID instead of a hard-coded object ID.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9350-fast-export.sh

@@ -132,12 +132,12 @@ test_expect_success 'reencoding iso-8859-7' '
 	sed "s/wer/i18n/" iso-8859-7.fi |
 		(cd new &&
 		 git fast-import &&
-		 # The commit object, if not re-encoded, would be 240 bytes.
+		 # The commit object, if not re-encoded, would be 200 bytes plus hash.
 		 # Removing the "encoding iso-8859-7\n" header drops 20 bytes.
 		 # Re-encoding the Pi character from \xF0 (\360) in iso-8859-7
 		 # to \xCF\x80 (\317\200) in UTF-8 adds a byte.  Check for
 		 # the expected size.
-		 test 221 -eq "$(git cat-file -s i18n)" &&
+		 test $(($(test_oid hexsz) + 181)) -eq "$(git cat-file -s i18n)" &&
 		 # ...and for the expected translation of bytes.
 		 git cat-file commit i18n >actual &&
 		 grep $(printf "\317\200") actual &&
@@ -164,12 +164,12 @@ test_expect_success 'preserving iso-8859-7' '
 	sed "s/wer/i18n-no-recoding/" iso-8859-7.fi |
 		(cd new &&
 		 git fast-import &&
-		 # The commit object, if not re-encoded, is 240 bytes.
+		 # The commit object, if not re-encoded, is 200 bytes plus hash.
 		 # Removing the "encoding iso-8859-7\n" header would drops 20
 		 # bytes.  Re-encoding the Pi character from \xF0 (\360) in
 		 # iso-8859-7 to \xCF\x80 (\317\200) in UTF-8 adds a byte.
 		 # Check for the expected size...
-		 test 240 -eq "$(git cat-file -s i18n-no-recoding)" &&
+		 test $(($(test_oid hexsz) + 200)) -eq "$(git cat-file -s i18n-no-recoding)" &&
 		 # ...as well as the expected byte.
 		 git cat-file commit i18n-no-recoding >actual &&
 		 grep $(printf "\360") actual &&
@@ -192,7 +192,7 @@ test_expect_success 'encoding preserved if reencoding fails' '
 		 grep ^encoding actual &&
 		 # Verify that the commit has the expected size; i.e.
 		 # that no bytes were re-encoded to a different encoding.
-		 test 252 -eq "$(git cat-file -s i18n-invalid)" &&
+		 test $(($(test_oid hexsz) + 212)) -eq "$(git cat-file -s i18n-invalid)" &&
 		 # ...and check for the original special bytes
 		 grep $(printf "\360") actual &&
 		 grep $(printf "\377") actual)
@@ -694,7 +694,7 @@ test_expect_success 'delete ref because entire history excluded' '
 	git fast-export to-delete ^to-delete >actual &&
 	cat >expected <<-EOF &&
 	reset refs/heads/to-delete
-	from 0000000000000000000000000000000000000000
+	from $ZERO_OID
 
 	EOF
 	test_cmp expected actual
@@ -704,7 +704,7 @@ test_expect_success 'delete refspec' '
 	git fast-export --refspec :refs/heads/to-delete >actual &&
 	cat >expected <<-EOF &&
 	reset refs/heads/to-delete
-	from 0000000000000000000000000000000000000000
+	from $ZERO_OID
 
 	EOF
 	test_cmp expected actual