--- /dev/null
+#include "clar_libgit2.h"
+#include "posix.h"
+
+/* Test that reading and writing a tree is a no-op */
+void test_index_read_tree__read_write_involution(void)
+{
+ git_repository *repo;
+ git_index *index;
+ git_oid tree_oid;
+ git_tree *tree;
+ git_oid expected;
+
+ p_mkdir("read_tree", 0700);
+
+ cl_git_pass(git_repository_init(&repo, "./read_tree", 0));
+ cl_git_pass(git_repository_index(&index, repo));
+
+ cl_assert(git_index_entrycount(index) == 0);
+
+ p_mkdir("./read_tree/abc", 0700);
+
+ /* Sort order: '-' < '/' < '_' */
+ cl_git_mkfile("./read_tree/abc-d", NULL);
+ cl_git_mkfile("./read_tree/abc/d", NULL);
+ cl_git_mkfile("./read_tree/abc_d", NULL);
+
+ cl_git_pass(git_index_add_bypath(index, "abc-d"));
+ cl_git_pass(git_index_add_bypath(index, "abc_d"));
+ cl_git_pass(git_index_add_bypath(index, "abc/d"));
+
+ /* write-tree */
+ cl_git_pass(git_index_write_tree(&expected, index));
+
+ /* read-tree */
+ git_tree_lookup(&tree, repo, &expected);
+ cl_git_pass(git_index_read_tree(index, tree));
+ git_tree_free(tree);
+
+ cl_git_pass(git_index_write_tree(&tree_oid, index));
+ cl_assert_equal_oid(&expected, &tree_oid);
+
+ git_index_free(index);
+ git_repository_free(repo);
+
+ cl_fixture_cleanup("read_tree");
+}