t4045: abstract away SHA-1-specific constants

diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
index 044620186d135fe5caeb9376665305af1c8acbe5..e009826fcbe5a893df748a47d162e010b95d758b 100755 (executable)
--- a/t/t4020-diff-external.sh
+++ b/t/t4020-diff-external.sh
@@ -13,6 +13,8 @@ test_expect_success setup '
 
        test_tick &&
        echo second >file &&
+       before=$(git hash-object file) &&
+       before=$(git rev-parse --short $before) &&
        git add file &&
        git commit -m second &&
 
@@ -26,7 +28,7 @@ test_expect_success 'GIT_EXTERNAL_DIFF environment' '
                read path oldfile oldhex oldmode newfile newhex newmode &&
                test "z$path" = zfile &&
                test "z$oldmode" = z100644 &&
-               test "z$newhex" = "z$_z40" &&
+               test "z$newhex" = "z$ZERO_OID" &&
                test "z$newmode" = z100644 &&
                oh=$(git rev-parse --verify HEAD:file) &&
                test "z$oh" = "z$oldhex"
@@ -55,7 +57,7 @@ test_expect_success SYMLINKS 'typechange diff' '
                read path oldfile oldhex oldmode newfile newhex newmode &&
                test "z$path" = zfile &&
                test "z$oldmode" = z100644 &&
-               test "z$newhex" = "z$_z40" &&
+               test "z$newhex" = "z$ZERO_OID" &&
                test "z$newmode" = z120000 &&
                oh=$(git rev-parse --verify HEAD:file) &&
                test "z$oh" = "z$oldhex"
@@ -73,7 +75,7 @@ test_expect_success 'diff.external' '
                read path oldfile oldhex oldmode newfile newhex newmode &&
                test "z$path" = zfile &&
                test "z$oldmode" = z100644 &&
-               test "z$newhex" = "z$_z40" &&
+               test "z$newhex" = "z$ZERO_OID" &&
                test "z$newmode" = z100644 &&
                oh=$(git rev-parse --verify HEAD:file) &&
                test "z$oh" = "z$oldhex"
@@ -104,7 +106,7 @@ test_expect_success 'diff attribute' '
                read path oldfile oldhex oldmode newfile newhex newmode &&
                test "z$path" = zfile &&
                test "z$oldmode" = z100644 &&
-               test "z$newhex" = "z$_z40" &&
+               test "z$newhex" = "z$ZERO_OID" &&
                test "z$newmode" = z100644 &&
                oh=$(git rev-parse --verify HEAD:file) &&
                test "z$oh" = "z$oldhex"
@@ -137,7 +139,7 @@ test_expect_success 'diff attribute' '
                read path oldfile oldhex oldmode newfile newhex newmode &&
                test "z$path" = zfile &&
                test "z$oldmode" = z100644 &&
-               test "z$newhex" = "z$_z40" &&
+               test "z$newhex" = "z$ZERO_OID" &&
                test "z$newmode" = z100644 &&
                oh=$(git rev-parse --verify HEAD:file) &&
                test "z$oh" = "z$oldhex"
@@ -180,9 +182,13 @@ test_expect_success 'no diff with -diff' '
 echo NULZbetweenZwords | perl -pe 'y/Z/\000/' > file
 
 test_expect_success 'force diff with "diff"' '
+       after=$(git hash-object file) &&
+       after=$(git rev-parse --short $after) &&
        echo >.gitattributes "file diff" &&
        git diff >actual &&
-       test_cmp "$TEST_DIRECTORY"/t4020/diff.NUL actual
+       sed -e "s/^index .*/index $before..$after 100644/" \
+               "$TEST_DIRECTORY"/t4020/diff.NUL >expected-diff &&
+       test_cmp expected-diff actual
 '
 
 test_expect_success 'GIT_EXTERNAL_DIFF with more than one changed files' '
@@ -237,7 +243,7 @@ test_expect_success 'diff --cached' '
        git update-index --assume-unchanged file &&
        echo second >file &&
        git diff --cached >actual &&
-       test_cmp "$TEST_DIRECTORY"/t4020/diff.NUL actual
+       test_cmp expected-diff actual
 '
 
 test_expect_success 'clean up crlf leftovers' '