Add deltifier test.

This test kicks in only if you built test-delta executable, and
makes sure that the basic delta routine is working properly even
on empty files.

This commit is to make sure we have a test to catch the
breakage.  The delitifier code is still broken, which will be
fixed with the next commit.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/t/t0001-delta.sh b/t/t0001-delta.sh
new file mode 100755 (executable)
index 0000000..2dd88e5
--- /dev/null
+++ b/t/t0001-delta.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+test_description='Deltification regression test'
+
+../test-delta 2>/dev/null
+test $? == 127 && {
+       echo "* Skipping test-delta regression test."
+       exit 0
+}
+
+. ./test-lib.sh
+
+>empty
+echo small >small
+echo smallish >smallish
+cat ../../COPYING >large
+sed -e 's/GNU/G.N.U/g' large >largish
+
+test_expect_success 'No regression in deltify code' \
+'
+fail=0
+for src in empty small smallish large largish
+do
+    for dst in empty small smallish large largish
+    do
+       if  test-delta -d $src $dst delta-$src-$dst &&
+           test-delta -p $src delta-$src-$dst out-$src-$dst &&
+           cmp $dst out-$src-$dst
+       then
+           echo "* OK ($src->$dst deitify and apply)"
+       else
+           echo "* FAIL ($src->$dst deitify and apply)"
+           fail=1
+       fi
+    done
+done
+case "$fail" in
+0) (exit 0) ;;
+*) (exit $fail) ;;
+esac
+'
+
+test_done

diff --git a/test-delta.c b/test-delta.c
index 1be8ee0..cc05794 100644 (file)
--- a/test-delta.c
+++ b/test-delta.c
@@ -38,7 +38,10 @@ int main(int argc, char *argv[])
                return 1;
        }
        from_size = st.st_size;
-       from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
+       if (from_size)
+               from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
+       else
+               from_buf = "";
        if (from_buf == MAP_FAILED) {
                perror(argv[2]);
                close(fd);
@@ -52,7 +55,11 @@ int main(int argc, char *argv[])
                return 1;
        }
        data_size = st.st_size;
-       data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
+
+       if (data_size)
+               data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
+       else
+               data_buf = "";
        if (data_buf == MAP_FAILED) {
                perror(argv[3]);
                close(fd);