add test_cmp function for test scripts

Many scripts compare actual and expected output using
"diff -u". This is nicer than "cmp" because the output shows
how the two differ. However, not all versions of diff
understand -u, leading to unnecessary test failure.

This adds a test_cmp function to the test scripts and
switches all "diff -u" invocations to use it. The function
uses the contents of "$GIT_TEST_CMP" to compare its
arguments; the default is "diff -u".

On systems with a less-capable diff, you can do:

  GIT_TEST_CMP=cmp make test

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/t/t9116-git-svn-log.sh b/t/t9116-git-svn-log.sh
index 902ed4145d..e1e8bdf0e3 100755
--- a/t/t9116-git-svn-log.sh
+++ b/t/t9116-git-svn-log.sh
@@ -55,74 +55,74 @@ printf 'r1 \nr2 \nr4 \n' > expected-range-r1-r2-r4
 
 test_expect_success 'test ascending revision range' "
 	git reset --hard trunk &&
-	git svn log -r 1:4 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r1-r2-r4 -
+	git svn log -r 1:4 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r1-r2-r4 -
 	"
 
 printf 'r4 \nr2 \nr1 \n' > expected-range-r4-r2-r1
 
 test_expect_success 'test descending revision range' "
 	git reset --hard trunk &&
-	git svn log -r 4:1 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4-r2-r1 -
+	git svn log -r 4:1 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r4-r2-r1 -
 	"
 
 printf 'r1 \nr2 \n' > expected-range-r1-r2
 
 test_expect_success 'test ascending revision range with unreachable revision' "
 	git reset --hard trunk &&
-	git svn log -r 1:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r1-r2 -
+	git svn log -r 1:3 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r1-r2 -
 	"
 
 printf 'r2 \nr1 \n' > expected-range-r2-r1
 
 test_expect_success 'test descending revision range with unreachable revision' "
 	git reset --hard trunk &&
-	git svn log -r 3:1 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r2-r1 -
+	git svn log -r 3:1 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r2-r1 -
 	"
 
 printf 'r2 \n' > expected-range-r2
 
 test_expect_success 'test ascending revision range with unreachable upper boundary revision and 1 commit' "
 	git reset --hard trunk &&
-	git svn log -r 2:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r2 -
+	git svn log -r 2:3 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r2 -
 	"
 
 test_expect_success 'test descending revision range with unreachable upper boundary revision and 1 commit' "
 	git reset --hard trunk &&
-	git svn log -r 3:2 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r2 -
+	git svn log -r 3:2 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r2 -
 	"
 
 printf 'r4 \n' > expected-range-r4
 
 test_expect_success 'test ascending revision range with unreachable lower boundary revision and 1 commit' "
 	git reset --hard trunk &&
-	git svn log -r 3:4 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	git svn log -r 3:4 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r4 -
 	"
 
 test_expect_success 'test descending revision range with unreachable lower boundary revision and 1 commit' "
 	git reset --hard trunk &&
-	git svn log -r 4:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	git svn log -r 4:3 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r4 -
 	"
 
 printf -- '------------------------------------------------------------------------\n' > expected-separator
 
 test_expect_success 'test ascending revision range with unreachable boundary revisions and no commits' "
 	git reset --hard trunk &&
-	git svn log -r 5:6 | diff -u expected-separator -
+	git svn log -r 5:6 | test_cmp expected-separator -
 	"
 
 test_expect_success 'test descending revision range with unreachable boundary revisions and no commits' "
 	git reset --hard trunk &&
-	git svn log -r 6:5 | diff -u expected-separator -
+	git svn log -r 6:5 | test_cmp expected-separator -
 	"
 
 test_expect_success 'test ascending revision range with unreachable boundary revisions and 1 commit' "
 	git reset --hard trunk &&
-	git svn log -r 3:5 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	git svn log -r 3:5 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r4 -
 	"
 
 test_expect_success 'test descending revision range with unreachable boundary revisions and 1 commit' "
 	git reset --hard trunk &&
-	git svn log -r 5:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	git svn log -r 5:3 | grep '^r[0-9]' | cut -d'|' -f1 | test_cmp expected-range-r4 -
 	"
 
 test_done