t/t4068-diff-symmetric-merge-base.sh

   1 #!/bin/sh
   2
   3 test_description='behavior of diff with symmetric-diff setups and --merge-base'
   4
   5 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
   6 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
   7
   8 . ./test-lib.sh
   9
  10 # build these situations:
  11 #  - normal merge with one merge base (br1...b2r);
  12 #  - criss-cross merge ie 2 merge bases (br1...main);
  13 #  - disjoint subgraph (orphan branch, br3...main).
  14 #
  15 #     B---E   <-- main
  16 #    / \ /
  17 #   A   X
  18 #    \ / \
  19 #     C---D--G   <-- br1
  20 #      \    /
  21 #       ---F   <-- br2
  22 #
  23 #  H  <-- br3
  24 #
  25 # We put files into a few commits so that we can verify the
  26 # output as well.
  27
  28 test_expect_success setup '
  29         git commit --allow-empty -m A &&
  30         echo b >b &&
  31         git add b &&
  32         git commit -m B &&
  33         git checkout -b br1 HEAD^ &&
  34         echo c >c &&
  35         git add c &&
  36         git commit -m C &&
  37         git tag commit-C &&
  38         git merge -m D main &&
  39         git tag commit-D &&
  40         git checkout main &&
  41         git merge -m E commit-C &&
  42         git checkout -b br2 commit-C &&
  43         echo f >f &&
  44         git add f &&
  45         git commit -m F &&
  46         git checkout br1 &&
  47         git merge -m G br2 &&
  48         git checkout --orphan br3 &&
  49         git commit -m H
  50 '
  51
  52 test_expect_success 'diff with one merge base' '
  53         git diff commit-D...br1 >tmp &&
  54         tail -n 1 tmp >actual &&
  55         echo +f >expect &&
  56         test_cmp expect actual
  57 '
  58
  59 # The output (in tmp) can have +b or +c depending
  60 # on which merge base (commit B or C) is picked.
  61 # It should have one of those two, which comes out
  62 # to seven lines.
  63 test_expect_success 'diff with two merge bases' '
  64         git diff br1...main >tmp 2>err &&
  65         test_line_count = 7 tmp &&
  66         test_line_count = 1 err
  67 '
  68
  69 test_expect_success 'diff with no merge bases' '
  70         test_must_fail git diff br2...br3 2>err &&
  71         test_i18ngrep "fatal: br2...br3: no merge base" err
  72 '
  73
  74 test_expect_success 'diff with too many symmetric differences' '
  75         test_must_fail git diff br1...main br2...br3 2>err &&
  76         test_i18ngrep "usage" err
  77 '
  78
  79 test_expect_success 'diff with symmetric difference and extraneous arg' '
  80         test_must_fail git diff main br1...main 2>err &&
  81         test_i18ngrep "usage" err
  82 '
  83
  84 test_expect_success 'diff with two ranges' '
  85         test_must_fail git diff main br1..main br2..br3 2>err &&
  86         test_i18ngrep "usage" err
  87 '
  88
  89 test_expect_success 'diff with ranges and extra arg' '
  90         test_must_fail git diff main br1..main commit-D 2>err &&
  91         test_i18ngrep "usage" err
  92 '
  93
  94 test_expect_success 'diff --merge-base with no commits' '
  95         test_must_fail git diff --merge-base
  96 '
  97
  98 test_expect_success 'diff --merge-base with three commits' '
  99         test_must_fail git diff --merge-base br1 br2 main 2>err &&
 100         test_i18ngrep "usage" err
 101 '
 102
 103 for cmd in diff-index diff
 104 do
 105         test_expect_success "$cmd --merge-base with one commit" '
 106                 git checkout main &&
 107                 git $cmd commit-C >expect &&
 108                 git $cmd --merge-base br2 >actual &&
 109                 test_cmp expect actual
 110         '
 111
 112         test_expect_success "$cmd --merge-base with one commit and unstaged changes" '
 113                 git checkout main &&
 114                 test_when_finished git reset --hard &&
 115                 echo unstaged >>c &&
 116                 git $cmd commit-C >expect &&
 117                 git $cmd --merge-base br2 >actual &&
 118                 test_cmp expect actual
 119         '
 120
 121         test_expect_success "$cmd --merge-base with one commit and staged and unstaged changes" '
 122                 git checkout main &&
 123                 test_when_finished git reset --hard &&
 124                 echo staged >>c &&
 125                 git add c &&
 126                 echo unstaged >>c &&
 127                 git $cmd commit-C >expect &&
 128                 git $cmd --merge-base br2 >actual &&
 129                 test_cmp expect actual
 130         '
 131
 132         test_expect_success "$cmd --merge-base --cached with one commit and staged and unstaged changes" '
 133                 git checkout main &&
 134                 test_when_finished git reset --hard &&
 135                 echo staged >>c &&
 136                 git add c &&
 137                 echo unstaged >>c &&
 138                 git $cmd --cached commit-C >expect &&
 139                 git $cmd --cached --merge-base br2 >actual &&
 140                 test_cmp expect actual
 141         '
 142
 143         test_expect_success "$cmd --merge-base with non-commit" '
 144                 git checkout main &&
 145                 test_must_fail git $cmd --merge-base main^{tree} 2>err &&
 146                 test_i18ngrep "fatal: --merge-base only works with commits" err
 147         '
 148
 149         test_expect_success "$cmd --merge-base with no merge bases and one commit" '
 150                 git checkout main &&
 151                 test_must_fail git $cmd --merge-base br3 2>err &&
 152                 test_i18ngrep "fatal: no merge base found" err
 153         '
 154
 155         test_expect_success "$cmd --merge-base with multiple merge bases and one commit" '
 156                 git checkout main &&
 157                 test_must_fail git $cmd --merge-base br1 2>err &&
 158                 test_i18ngrep "fatal: multiple merge bases found" err
 159         '
 160 done
 161
 162 for cmd in diff-tree diff
 163 do
 164         test_expect_success "$cmd --merge-base with two commits" '
 165                 git $cmd commit-C main >expect &&
 166                 git $cmd --merge-base br2 main >actual &&
 167                 test_cmp expect actual
 168         '
 169
 170         test_expect_success "$cmd --merge-base commit and non-commit" '
 171                 test_must_fail git $cmd --merge-base br2 main^{tree} 2>err &&
 172                 test_i18ngrep "fatal: --merge-base only works with commits" err
 173         '
 174
 175         test_expect_success "$cmd --merge-base with no merge bases and two commits" '
 176                 test_must_fail git $cmd --merge-base br2 br3 2>err &&
 177                 test_i18ngrep "fatal: no merge base found" err
 178         '
 179
 180         test_expect_success "$cmd --merge-base with multiple merge bases and two commits" '
 181                 test_must_fail git $cmd --merge-base main br1 2>err &&
 182                 test_i18ngrep "fatal: multiple merge bases found" err
 183         '
 184 done
 185
 186 test_expect_success 'diff-tree --merge-base with one commit' '
 187         test_must_fail git diff-tree --merge-base main 2>err &&
 188         test_i18ngrep "fatal: --merge-base only works with two commits" err
 189 '
 190
 191 test_expect_success 'diff --merge-base with range' '
 192         test_must_fail git diff --merge-base br2..br3 2>err &&
 193         test_i18ngrep "fatal: --merge-base does not work with ranges" err
 194 '
 195
 196 test_done