tests/diff/externalmodifications.c

   1 #include "clar_libgit2.h"
   2 #include "../checkout/checkout_helpers.h"
   3
   4 #include "index.h"
   5 #include "repository.h"
   6
   7 static git_repository *g_repo;
   8
   9 void test_diff_externalmodifications__initialize(void)
  10 {
  11         g_repo = cl_git_sandbox_init("testrepo2");
  12 }
  13
  14 void test_diff_externalmodifications__cleanup(void)
  15 {
  16         cl_git_sandbox_cleanup();
  17         g_repo = NULL;
  18 }
  19
  20 void test_diff_externalmodifications__file_becomes_smaller(void)
  21 {
  22         git_index *index;
  23         git_diff *diff;
  24         git_patch* patch;
  25         git_str path = GIT_STR_INIT;
  26         char big_string[500001];
  27
  28         cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  29
  30         /* Modify the file with a large string */
  31         memset(big_string, '\n', sizeof(big_string) - 1);
  32         big_string[sizeof(big_string) - 1] = '\0';
  33         cl_git_mkfile(path.ptr, big_string);
  34
  35         /* Get a diff */
  36         cl_git_pass(git_repository_index(&index, g_repo));
  37         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  38         cl_assert_equal_i(1, git_diff_num_deltas(diff));
  39         cl_assert_equal_i(500000, git_diff_get_delta(diff, 0)->new_file.size);
  40
  41         /* Simulate file modification after we've gotten the diff.
  42          * Write a shorter string to ensure that we don't mmap 500KB from
  43          * the previous revision, which would most likely crash. */
  44         cl_git_mkfile(path.ptr, "hello");
  45
  46         /* Attempt to get a patch */
  47         cl_git_fail(git_patch_from_diff(&patch, diff, 0));
  48
  49         git_index_free(index);
  50         git_diff_free(diff);
  51         git_str_dispose(&path);
  52 }
  53
  54 void test_diff_externalmodifications__file_becomes_empty(void)
  55 {
  56         git_index *index;
  57         git_diff *diff;
  58         git_patch* patch;
  59         git_str path = GIT_STR_INIT;
  60
  61         cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  62
  63         /* Modify the file */
  64         cl_git_mkfile(path.ptr, "hello");
  65
  66         /* Get a diff */
  67         cl_git_pass(git_repository_index(&index, g_repo));
  68         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  69         cl_assert_equal_i(1, git_diff_num_deltas(diff));
  70         cl_assert_equal_i(5, git_diff_get_delta(diff, 0)->new_file.size);
  71
  72         /* Empty out the file after we've gotten the diff */
  73         cl_git_mkfile(path.ptr, "");
  74
  75         /* Attempt to get a patch */
  76         cl_git_fail(git_patch_from_diff(&patch, diff, 0));
  77
  78         git_index_free(index);
  79         git_diff_free(diff);
  80         git_str_dispose(&path);
  81 }
  82
  83 void test_diff_externalmodifications__file_deleted(void)
  84 {
  85         git_index *index;
  86         git_diff *diff;
  87         git_patch* patch;
  88         git_str path = GIT_STR_INIT;
  89
  90         cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
  91
  92         /* Get a diff */
  93         cl_git_pass(git_repository_index(&index, g_repo));
  94         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  95         cl_assert_equal_i(0, git_diff_num_deltas(diff));
  96
  97         /* Delete the file */
  98         cl_git_rmfile(path.ptr);
  99
 100         /* Attempt to get a patch */
 101         cl_git_fail(git_patch_from_diff(&patch, diff, 0));
 102
 103         git_index_free(index);
 104         git_diff_free(diff);
 105         git_str_dispose(&path);
 106 }
 107
 108 void test_diff_externalmodifications__empty_file_becomes_non_empty(void)
 109 {
 110         git_index *index;
 111         git_diff *diff;
 112         git_patch* patch;
 113         git_str path = GIT_STR_INIT;
 114
 115         cl_git_pass(git_str_joinpath(&path, git_repository_workdir(g_repo), "README"));
 116
 117         /* Empty out the file */
 118         cl_git_mkfile(path.ptr, "");
 119
 120         /* Get a diff */
 121         cl_git_pass(git_repository_index(&index, g_repo));
 122         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
 123         cl_assert_equal_i(1, git_diff_num_deltas(diff));
 124         cl_assert_equal_i(0, git_diff_get_delta(diff, 0)->new_file.size);
 125
 126         /* Simulate file modification after we've gotten the diff */
 127         cl_git_mkfile(path.ptr, "hello");
 128         cl_git_fail(git_patch_from_diff(&patch, diff, 0));
 129
 130         git_index_free(index);
 131         git_diff_free(diff);
 132         git_str_dispose(&path);
 133 }