binary diff: test that the diff and patch otputs are the samecmn/diff-binary-patch

We test the generation of the textual patch via the patch function,
which are just one of two possibilities to get the output.

Add a second patch generation via the diff function to make sure both
outputs are in sync.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/diff/binary.c b/tests/diff/binary.c
index 424a53e5f..90f2d5a06 100644
--- a/tests/diff/binary.c
+++ b/tests/diff/binary.c
@@ -1,5 +1,7 @@
 #include "clar_libgit2.h"
 
+#include "git2/sys/diff.h"
+
 #include "buffer.h"
 #include "filebuf.h"
 
@@ -49,6 +51,11 @@ void test_patch(
 
 	cl_assert_equal_s(expected, actual.ptr);
 
+	git_buf_clear(&actual);
+	cl_git_pass(git_diff_print(diff, GIT_DIFF_FORMAT_PATCH, git_diff_print_callback__to_buf, &actual));
+
+	cl_assert_equal_s(expected, actual.ptr);
+
 	git_buf_free(&actual);
 	git_patch_free(patch);
 	git_diff_free(diff);