tests: set racy times manually

tests/diff/racy.c

@@ -2,6 +2,7 @@
 #include "../checkout/checkout_helpers.h"
 
 #include "buffer.h"
+#include "index.h"
 
 static git_repository *g_repo;
 
@@ -52,29 +53,48 @@ void test_diff_racy__write_index_just_after_file(void)
 	git_index *index;
 	git_diff *diff;
 	git_buf path = GIT_BUF_INIT;
+	struct timeval times[2];
 
 	/* Make sure we do have a timestamp */
 	cl_git_pass(git_repository_index(&index, g_repo));
 	cl_git_pass(git_index_write(index));
-	/* The timestamp will be one second before we change the file */
-	sleep(1);
 
 	cl_git_pass(git_buf_joinpath(&path, git_repository_workdir(g_repo), "A"));
 	cl_git_mkfile(path.ptr, "A");
+	/* Force the file's timestamp to be a second after we wrote the index */
+	times[0].tv_sec = index->stamp.mtime + 1;
+	times[0].tv_usec = 0;
+	times[1].tv_sec = index->stamp.mtime + 1;
+	times[1].tv_usec = 0;
+	cl_git_pass(p_utimes(path.ptr, times));
 
 	/*
 	 * Put 'A' into the index, the size field will be filled,
 	 * because the index' on-disk timestamp does not match the
-	 * file's timestamp. Both timestamps will however match after
-	 * writing out the index.
+	 * file's timestamp.
 	 */
-	cl_git_pass(git_repository_index(&index, g_repo));
 	cl_git_pass(git_index_add_bypath(index, "A"));
 	cl_git_pass(git_index_write(index));
 
-	/* Change its contents quickly, so we get the same timestamp */
 	cl_git_mkfile(path.ptr, "B");
+	/*
+	 * Pretend this index' modification happend a second after the
+	 * file update, and rewrite the file in that same second.
+	 */
+	times[0].tv_sec = index->stamp.mtime + 2;
+	times[0].tv_usec = 0;
+	times[1].tv_sec = index->stamp.mtime + 2;
+	times[0].tv_usec = 0;
+
+	cl_git_pass(p_utimes(git_index_path(index), times));
+	cl_git_pass(p_utimes(path.ptr, times));
+
+	cl_git_pass(git_index_read(index, true));
 
 	cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
 	cl_assert_equal_i(1, git_diff_num_deltas(diff));
+
+	git_buf_free(&path);
+	git_diff_free(diff);
+	git_index_free(index);
 }