thodg/libgit2/tests/diff/externalmodifications.c

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• Hash : e1415dc3
  Author :
  Date : 2022-02-11T11:02:00
  

  diff_file: test empty workdir file grows after obtaining a diff This test was also provided by @jorio https://github.com/libgit2/libgit2/pull/6208#issuecomment-1034072050

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• tests/diff/externalmodifications.c

• #include "clar_libgit2.h"
  #include "../checkout/checkout_helpers.h"
  
  #include "index.h"
  #include "repository.h"
  
  static git_repository *g_repo;
  
  void test_diff_externalmodifications__initialize(void)
  {
  	g_repo = cl_git_sandbox_init("testrepo2");
  }
  
  void test_diff_externalmodifications__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  	g_repo = NULL;
  }
  
  void test_diff_externalmodifications__file_becomes_smaller(void)
  {
  	git_index *index;
  	git_diff *diff;
  	git_patch* patch;
  	git_str path = GIT_STR_INIT;
  	char big_string[500001];
  
  	cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  
  	/* Modify the file with a large string */
  	memset(big_string, '\n', sizeof(big_string) - 1);
  	big_string[sizeof(big_string) - 1] = '\0';
  	cl_git_mkfile(path.ptr, big_string);
  
  	/* Get a diff */
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  	cl_assert_equal_i(1, git_diff_num_deltas(diff));
  	cl_assert_equal_i(500000, git_diff_get_delta(diff, 0)->new_file.size);
  
  	/* Simulate file modification after we've gotten the diff.
  	 * Write a shorter string to ensure that we don't mmap 500KB from
  	 * the previous revision, which would most likely crash. */
  	cl_git_mkfile(path.ptr, "hello");
  
  	/* Attempt to get a patch */
  	cl_git_fail(git_patch_from_diff(&patch, diff, 0));
  
  	git_index_free(index);
  	git_diff_free(diff);
  	git_str_dispose(&path);
  }
  
  void test_diff_externalmodifications__file_becomes_empty(void)
  {
  	git_index *index;
  	git_diff *diff;
  	git_patch* patch;
  	git_str path = GIT_STR_INIT;
  
  	cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  
  	/* Modify the file */
  	cl_git_mkfile(path.ptr, "hello");
  
  	/* Get a diff */
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  	cl_assert_equal_i(1, git_diff_num_deltas(diff));
  	cl_assert_equal_i(5, git_diff_get_delta(diff, 0)->new_file.size);
  
  	/* Empty out the file after we've gotten the diff */
  	cl_git_mkfile(path.ptr, "");
  
  	/* Attempt to get a patch */
  	cl_git_fail(git_patch_from_diff(&patch, diff, 0));
  
  	git_index_free(index);
  	git_diff_free(diff);
  	git_str_dispose(&path);
  }
  
  void test_diff_externalmodifications__file_deleted(void)
  {
  	git_index *index;
  	git_diff *diff;
  	git_patch* patch;
  	git_str path = GIT_STR_INIT;
  
  	cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  
  	/* Get a diff */
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  	cl_assert_equal_i(0, git_diff_num_deltas(diff));
  
  	/* Delete the file */
  	cl_git_rmfile(path.ptr);
  
  	/* Attempt to get a patch */
  	cl_git_fail(git_patch_from_diff(&patch, diff, 0));
  
  	git_index_free(index);
  	git_diff_free(diff);
  	git_str_dispose(&path);
  }
  
  void test_diff_externalmodifications__empty_file_becomes_non_empty(void)
  {
  	git_index *index;
  	git_diff *diff;
  	git_patch* patch;
  	git_str path = GIT_STR_INIT;
  
  	cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  
  	/* Empty out the file */
  	cl_git_mkfile(path.ptr, "");
  
  	/* Get a diff */
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  	cl_assert_equal_i(1, git_diff_num_deltas(diff));
  	cl_assert_equal_i(0, git_diff_get_delta(diff, 0)->new_file.size);
  
  	/* Simulate file modification after we've gotten the diff */
  	cl_git_mkfile(path.ptr, "hello");
  	cl_git_fail(git_patch_from_diff(&patch, diff, 0));
  
  	git_index_free(index);
  	git_diff_free(diff);
  	git_str_dispose(&path);
  }
  

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