t/t6036-recursive-corner-cases.sh

   1 #!/bin/sh
   2
   3 test_description='recursive merge corner cases involving criss-cross merges'
   4
   5 . ./test-lib.sh
   6
   7 get_clean_checkout () {
   8         git reset --hard &&
   9         git clean -fdqx &&
  10         git checkout "$1"
  11 }
  12
  13 #
  14 #  L1  L2
  15 #   o---o
  16 #  / \ / \
  17 # o   X   ?
  18 #  \ / \ /
  19 #   o---o
  20 #  R1  R2
  21 #
  22
  23 test_expect_success 'setup basic criss-cross + rename with no modifications' '
  24         ten="0 1 2 3 4 5 6 7 8 9" &&
  25         for i in $ten
  26         do
  27                 echo line $i in a sample file
  28         done >one &&
  29         for i in $ten
  30         do
  31                 echo line $i in another sample file
  32         done >two &&
  33         git add one two &&
  34         test_tick && git commit -m initial &&
  35
  36         git branch L1 &&
  37         git checkout -b R1 &&
  38         git mv one three &&
  39         test_tick && git commit -m R1 &&
  40
  41         git checkout L1 &&
  42         git mv two three &&
  43         test_tick && git commit -m L1 &&
  44
  45         git checkout L1^0 &&
  46         test_tick && git merge -s ours R1 &&
  47         git tag L2 &&
  48
  49         git checkout R1^0 &&
  50         test_tick && git merge -s ours L1 &&
  51         git tag R2
  52 '
  53
  54 test_expect_success 'merge simple rename+criss-cross with no modifications' '
  55         git reset --hard &&
  56         git checkout L2^0 &&
  57
  58         test_must_fail git merge -s recursive R2^0 &&
  59
  60         test 5 = $(git ls-files -s | wc -l) &&
  61         test 3 = $(git ls-files -u | wc -l) &&
  62         test 0 = $(git ls-files -o | wc -l) &&
  63
  64         test $(git rev-parse :0:one) = $(git rev-parse L2:one) &&
  65         test $(git rev-parse :0:two) = $(git rev-parse R2:two) &&
  66         test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
  67         test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
  68
  69         cp two merged &&
  70         >empty &&
  71         test_must_fail git merge-file \
  72                 -L "Temporary merge branch 2" \
  73                 -L "" \
  74                 -L "Temporary merge branch 1" \
  75                 merged empty one &&
  76         test $(git rev-parse :1:three) = $(git hash-object merged)
  77 '
  78
  79 #
  80 # Same as before, but modify L1 slightly:
  81 #
  82 #  L1m L2
  83 #   o---o
  84 #  / \ / \
  85 # o   X   ?
  86 #  \ / \ /
  87 #   o---o
  88 #  R1  R2
  89 #
  90
  91 test_expect_success 'setup criss-cross + rename merges with basic modification' '
  92         git rm -rf . &&
  93         git clean -fdqx &&
  94         rm -rf .git &&
  95         git init &&
  96
  97         ten="0 1 2 3 4 5 6 7 8 9"
  98         for i in $ten
  99         do
 100                 echo line $i in a sample file
 101         done >one &&
 102         for i in $ten
 103         do
 104                 echo line $i in another sample file
 105         done >two &&
 106         git add one two &&
 107         test_tick && git commit -m initial &&
 108
 109         git branch L1 &&
 110         git checkout -b R1 &&
 111         git mv one three &&
 112         echo more >>two &&
 113         git add two &&
 114         test_tick && git commit -m R1 &&
 115
 116         git checkout L1 &&
 117         git mv two three &&
 118         test_tick && git commit -m L1 &&
 119
 120         git checkout L1^0 &&
 121         test_tick && git merge -s ours R1 &&
 122         git tag L2 &&
 123
 124         git checkout R1^0 &&
 125         test_tick && git merge -s ours L1 &&
 126         git tag R2
 127 '
 128
 129 test_expect_success 'merge criss-cross + rename merges with basic modification' '
 130         git reset --hard &&
 131         git checkout L2^0 &&
 132
 133         test_must_fail git merge -s recursive R2^0 &&
 134
 135         test 5 = $(git ls-files -s | wc -l) &&
 136         test 3 = $(git ls-files -u | wc -l) &&
 137         test 0 = $(git ls-files -o | wc -l) &&
 138
 139         test $(git rev-parse :0:one) = $(git rev-parse L2:one) &&
 140         test $(git rev-parse :0:two) = $(git rev-parse R2:two) &&
 141         test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
 142         test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
 143
 144         head -n 10 two >merged &&
 145         cp one merge-me &&
 146         >empty &&
 147         test_must_fail git merge-file \
 148                 -L "Temporary merge branch 2" \
 149                 -L "" \
 150                 -L "Temporary merge branch 1" \
 151                 merged empty merge-me &&
 152         test $(git rev-parse :1:three) = $(git hash-object merged)
 153 '
 154
 155 #
 156 # For the next test, we start with three commits in two lines of development
 157 # which setup a rename/add conflict:
 158 #   Commit A: File 'a' exists
 159 #   Commit B: Rename 'a' -> 'new_a'
 160 #   Commit C: Modify 'a', create different 'new_a'
 161 # Later, two different people merge and resolve differently:
 162 #   Commit D: Merge B & C, ignoring separately created 'new_a'
 163 #   Commit E: Merge B & C making use of some piece of secondary 'new_a'
 164 # Finally, someone goes to merge D & E.  Does git detect the conflict?
 165 #
 166 #      B   D
 167 #      o---o
 168 #     / \ / \
 169 #  A o   X   ? F
 170 #     \ / \ /
 171 #      o---o
 172 #      C   E
 173 #
 174
 175 test_expect_success 'setup differently handled merges of rename/add conflict' '
 176         git rm -rf . &&
 177         git clean -fdqx &&
 178         rm -rf .git &&
 179         git init &&
 180
 181         printf "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n" >a &&
 182         git add a &&
 183         test_tick && git commit -m A &&
 184
 185         git branch B &&
 186         git checkout -b C &&
 187         echo 10 >>a &&
 188         echo "other content" >>new_a &&
 189         git add a new_a &&
 190         test_tick && git commit -m C &&
 191
 192         git checkout B &&
 193         git mv a new_a &&
 194         test_tick && git commit -m B &&
 195
 196         git checkout B^0 &&
 197         test_must_fail git merge C &&
 198         git clean -f &&
 199         test_tick && git commit -m D &&
 200         git tag D &&
 201
 202         git checkout C^0 &&
 203         test_must_fail git merge B &&
 204         rm new_a~HEAD new_a &&
 205         printf "Incorrectly merged content" >>new_a &&
 206         git add -u &&
 207         test_tick && git commit -m E &&
 208         git tag E
 209 '
 210
 211 test_expect_success 'git detects differently handled merges conflict' '
 212         git reset --hard &&
 213         git checkout D^0 &&
 214
 215         git merge -s recursive E^0 && {
 216                 echo "BAD: should have conflicted"
 217                 test "Incorrectly merged content" = "$(cat new_a)" &&
 218                         echo "BAD: Silently accepted wrong content"
 219                 return 1
 220         }
 221
 222         test 3 = $(git ls-files -s | wc -l) &&
 223         test 3 = $(git ls-files -u | wc -l) &&
 224         test 0 = $(git ls-files -o | wc -l) &&
 225
 226         test $(git rev-parse :2:new_a) = $(git rev-parse D:new_a) &&
 227         test $(git rev-parse :3:new_a) = $(git rev-parse E:new_a) &&
 228
 229         git cat-file -p B:new_a >>merged &&
 230         git cat-file -p C:new_a >>merge-me &&
 231         >empty &&
 232         test_must_fail git merge-file \
 233                 -L "Temporary merge branch 2" \
 234                 -L "" \
 235                 -L "Temporary merge branch 1" \
 236                 merged empty merge-me &&
 237         test $(git rev-parse :1:new_a) = $(git hash-object merged)
 238 '
 239
 240 #
 241 # criss-cross + modify/delete:
 242 #
 243 #      B   D
 244 #      o---o
 245 #     / \ / \
 246 #  A o   X   ? F
 247 #     \ / \ /
 248 #      o---o
 249 #      C   E
 250 #
 251 #   Commit A: file with contents 'A\n'
 252 #   Commit B: file with contents 'B\n'
 253 #   Commit C: file not present
 254 #   Commit D: file with contents 'B\n'
 255 #   Commit E: file not present
 256 #
 257 # Merging commits D & E should result in modify/delete conflict.
 258
 259 test_expect_success 'setup criss-cross + modify/delete resolved differently' '
 260         git rm -rf . &&
 261         git clean -fdqx &&
 262         rm -rf .git &&
 263         git init &&
 264
 265         echo A >file &&
 266         git add file &&
 267         test_tick &&
 268         git commit -m A &&
 269
 270         git branch B &&
 271         git checkout -b C &&
 272         git rm file &&
 273         test_tick &&
 274         git commit -m C &&
 275
 276         git checkout B &&
 277         echo B >file &&
 278         git add file &&
 279         test_tick &&
 280         git commit -m B &&
 281
 282         git checkout B^0 &&
 283         test_must_fail git merge C &&
 284         echo B >file &&
 285         git add file &&
 286         test_tick &&
 287         git commit -m D &&
 288         git tag D &&
 289
 290         git checkout C^0 &&
 291         test_must_fail git merge B &&
 292         git rm file &&
 293         test_tick &&
 294         git commit -m E &&
 295         git tag E
 296 '
 297
 298 test_expect_failure 'git detects conflict merging criss-cross+modify/delete' '
 299         git checkout D^0 &&
 300
 301         test_must_fail git merge -s recursive E^0 &&
 302
 303         test 2 -eq $(git ls-files -s | wc -l) &&
 304         test 2 -eq $(git ls-files -u | wc -l) &&
 305
 306         test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 307         test $(git rev-parse :2:file) = $(git rev-parse B:file)
 308 '
 309
 310 test_expect_failure 'git detects conflict merging criss-cross+modify/delete, reverse direction' '
 311         git reset --hard &&
 312         git checkout E^0 &&
 313
 314         test_must_fail git merge -s recursive D^0 &&
 315
 316         test 2 -eq $(git ls-files -s | wc -l) &&
 317         test 2 -eq $(git ls-files -u | wc -l) &&
 318
 319         test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 320         test $(git rev-parse :3:file) = $(git rev-parse B:file)
 321 '
 322
 323 #
 324 # criss-cross + modify/modify with very contrived file contents:
 325 #
 326 #      B   D
 327 #      o---o
 328 #     / \ / \
 329 #  A o   X   ? F
 330 #     \ / \ /
 331 #      o---o
 332 #      C   E
 333 #
 334 #   Commit A: file with contents 'A\n'
 335 #   Commit B: file with contents 'B\n'
 336 #   Commit C: file with contents 'C\n'
 337 #   Commit D: file with contents 'D\n'
 338 #   Commit E: file with contents:
 339 #      <<<<<<< Temporary merge branch 1
 340 #      C
 341 #      =======
 342 #      B
 343 #      >>>>>>> Temporary merge branch 2
 344 #
 345 # Now, when we merge commits D & E, does git detect the conflict?
 346
 347 test_expect_success 'setup differently handled merges of content conflict' '
 348         git clean -fdqx &&
 349         rm -rf .git &&
 350         git init &&
 351
 352         echo A >file &&
 353         git add file &&
 354         test_tick &&
 355         git commit -m A &&
 356
 357         git branch B &&
 358         git checkout -b C &&
 359         echo C >file &&
 360         git add file &&
 361         test_tick &&
 362         git commit -m C &&
 363
 364         git checkout B &&
 365         echo B >file &&
 366         git add file &&
 367         test_tick &&
 368         git commit -m B &&
 369
 370         git checkout B^0 &&
 371         test_must_fail git merge C &&
 372         echo D >file &&
 373         git add file &&
 374         test_tick &&
 375         git commit -m D &&
 376         git tag D &&
 377
 378         git checkout C^0 &&
 379         test_must_fail git merge B &&
 380         cat <<EOF >file &&
 381 <<<<<<< Temporary merge branch 1
 382 C
 383 =======
 384 B
 385 >>>>>>> Temporary merge branch 2
 386 EOF
 387         git add file &&
 388         test_tick &&
 389         git commit -m E &&
 390         git tag E
 391 '
 392
 393 test_expect_failure 'git detects conflict w/ criss-cross+contrived resolution' '
 394         git checkout D^0 &&
 395
 396         test_must_fail git merge -s recursive E^0 &&
 397
 398         test 3 -eq $(git ls-files -s | wc -l) &&
 399         test 3 -eq $(git ls-files -u | wc -l) &&
 400         test 0 -eq $(git ls-files -o | wc -l) &&
 401
 402         test $(git rev-parse :2:file) = $(git rev-parse D:file) &&
 403         test $(git rev-parse :3:file) = $(git rev-parse E:file)
 404 '
 405
 406 #
 407 # criss-cross + d/f conflict via add/add:
 408 #   Commit A: Neither file 'a' nor directory 'a/' exist.
 409 #   Commit B: Introduce 'a'
 410 #   Commit C: Introduce 'a/file'
 411 #   Commit D: Merge B & C, keeping 'a' and deleting 'a/'
 412 #
 413 # Two different later cases:
 414 #   Commit E1: Merge B & C, deleting 'a' but keeping 'a/file'
 415 #   Commit E2: Merge B & C, deleting 'a' but keeping a slightly modified 'a/file'
 416 #
 417 #      B   D
 418 #      o---o
 419 #     / \ / \
 420 #  A o   X   ? F
 421 #     \ / \ /
 422 #      o---o
 423 #      C   E1 or E2
 424 #
 425 # Merging D & E1 requires we first create a virtual merge base X from
 426 # merging A & B in memory.  Now, if X could keep both 'a' and 'a/file' in
 427 # the index, then the merge of D & E1 could be resolved cleanly with both
 428 # 'a' and 'a/file' removed.  Since git does not currently allow creating
 429 # such a tree, the best we can do is have X contain both 'a~<unique>' and
 430 # 'a/file' resulting in the merge of D and E1 having a rename/delete
 431 # conflict for 'a'.  (Although this merge appears to be unsolvable with git
 432 # currently, git could do a lot better than it currently does with these
 433 # d/f conflicts, which is the purpose of this test.)
 434 #
 435 # Merge of D & E2 has similar issues for path 'a', but should always result
 436 # in a modify/delete conflict for path 'a/file'.
 437 #
 438 # We run each merge in both directions, to check for directional issues
 439 # with D/F conflict handling.
 440 #
 441
 442 test_expect_success 'setup differently handled merges of directory/file conflict' '
 443         git rm -rf . &&
 444         git clean -fdqx &&
 445         rm -rf .git &&
 446         git init &&
 447
 448         >ignore-me &&
 449         git add ignore-me &&
 450         test_tick &&
 451         git commit -m A &&
 452         git tag A &&
 453
 454         git branch B &&
 455         git checkout -b C &&
 456         mkdir a &&
 457         echo 10 >a/file &&
 458         git add a/file &&
 459         test_tick &&
 460         git commit -m C &&
 461
 462         git checkout B &&
 463         echo 5 >a &&
 464         git add a &&
 465         test_tick &&
 466         git commit -m B &&
 467
 468         git checkout B^0 &&
 469         test_must_fail git merge C &&
 470         git clean -f &&
 471         rm -rf a/ &&
 472         echo 5 >a &&
 473         git add a &&
 474         test_tick &&
 475         git commit -m D &&
 476         git tag D &&
 477
 478         git checkout C^0 &&
 479         test_must_fail git merge B &&
 480         git clean -f &&
 481         git rm --cached a &&
 482         echo 10 >a/file &&
 483         git add a/file &&
 484         test_tick &&
 485         git commit -m E1 &&
 486         git tag E1 &&
 487
 488         git checkout C^0 &&
 489         test_must_fail git merge B &&
 490         git clean -f &&
 491         git rm --cached a &&
 492         printf "10\n11\n" >a/file &&
 493         git add a/file &&
 494         test_tick &&
 495         git commit -m E2 &&
 496         git tag E2
 497 '
 498
 499 test_expect_success 'merge of D & E1 fails but has appropriate contents' '
 500         get_clean_checkout D^0 &&
 501
 502         test_must_fail git merge -s recursive E1^0 &&
 503
 504         test 2 -eq $(git ls-files -s | wc -l) &&
 505         test 1 -eq $(git ls-files -u | wc -l) &&
 506         test 0 -eq $(git ls-files -o | wc -l) &&
 507
 508         test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 509         test $(git rev-parse :2:a) = $(git rev-parse B:a)
 510 '
 511
 512 test_expect_success 'merge of E1 & D fails but has appropriate contents' '
 513         get_clean_checkout E1^0 &&
 514
 515         test_must_fail git merge -s recursive D^0 &&
 516
 517         test 2 -eq $(git ls-files -s | wc -l) &&
 518         test 1 -eq $(git ls-files -u | wc -l) &&
 519         test 0 -eq $(git ls-files -o | wc -l) &&
 520
 521         test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 522         test $(git rev-parse :3:a) = $(git rev-parse B:a)
 523 '
 524
 525 test_expect_success 'merge of D & E2 fails but has appropriate contents' '
 526         get_clean_checkout D^0 &&
 527
 528         test_must_fail git merge -s recursive E2^0 &&
 529
 530         test 4 -eq $(git ls-files -s | wc -l) &&
 531         test 3 -eq $(git ls-files -u | wc -l) &&
 532         test 1 -eq $(git ls-files -o | wc -l) &&
 533
 534         test $(git rev-parse :2:a) = $(git rev-parse B:a) &&
 535         test $(git rev-parse :3:a/file) = $(git rev-parse E2:a/file) &&
 536         test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
 537         test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 538
 539         test -f a~HEAD
 540 '
 541
 542 test_expect_success 'merge of E2 & D fails but has appropriate contents' '
 543         get_clean_checkout E2^0 &&
 544
 545         test_must_fail git merge -s recursive D^0 &&
 546
 547         test 4 -eq $(git ls-files -s | wc -l) &&
 548         test 3 -eq $(git ls-files -u | wc -l) &&
 549         test 1 -eq $(git ls-files -o | wc -l) &&
 550
 551         test $(git rev-parse :3:a) = $(git rev-parse B:a) &&
 552         test $(git rev-parse :2:a/file) = $(git rev-parse E2:a/file) &&
 553         test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file)
 554         test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 555
 556         test -f a~D^0
 557 '
 558
 559 #
 560 # criss-cross with rename/rename(1to2)/modify followed by
 561 # rename/rename(2to1)/modify:
 562 #
 563 #      B   D
 564 #      o---o
 565 #     / \ / \
 566 #  A o   X   ? F
 567 #     \ / \ /
 568 #      o---o
 569 #      C   E
 570 #
 571 #   Commit A: new file: a
 572 #   Commit B: rename a->b, modifying by adding a line
 573 #   Commit C: rename a->c
 574 #   Commit D: merge B&C, resolving conflict by keeping contents in newname
 575 #   Commit E: merge B&C, resolving conflict similar to D but adding another line
 576 #
 577 # There is a conflict merging B & C, but one of filename not of file
 578 # content.  Whoever created D and E chose specific resolutions for that
 579 # conflict resolution.  Now, since: (1) there is no content conflict
 580 # merging B & C, (2) D does not modify that merged content further, and (3)
 581 # both D & E resolve the name conflict in the same way, the modification to
 582 # newname in E should not cause any conflicts when it is merged with D.
 583 # (Note that this can be accomplished by having the virtual merge base have
 584 # the merged contents of b and c stored in a file named a, which seems like
 585 # the most logical choice anyway.)
 586 #
 587 # Comment from Junio: I do not necessarily agree with the choice "a", but
 588 # it feels sound to say "B and C do not agree what the final pathname
 589 # should be, but we know this content was derived from the common A:a so we
 590 # use one path whose name is arbitrary in the virtual merge base X between
 591 # D and E" and then further let the rename detection to notice that that
 592 # arbitrary path gets renamed between X-D to "newname" and X-E also to
 593 # "newname" to resolve it as both sides renaming it to the same new
 594 # name. It is akin to what we do at the content level, i.e. "B and C do not
 595 # agree what the final contents should be, so we leave the conflict marker
 596 # but that may cancel out at the final merge stage".
 597
 598 test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 599         git reset --hard &&
 600         git rm -rf . &&
 601         git clean -fdqx &&
 602         rm -rf .git &&
 603         git init &&
 604
 605         printf "1\n2\n3\n4\n5\n6\n" >a &&
 606         git add a &&
 607         git commit -m A &&
 608         git tag A &&
 609
 610         git checkout -b B A &&
 611         git mv a b &&
 612         echo 7 >>b &&
 613         git add -u &&
 614         git commit -m B &&
 615
 616         git checkout -b C A &&
 617         git mv a c &&
 618         git commit -m C &&
 619
 620         git checkout -q B^0 &&
 621         git merge --no-commit -s ours C^0 &&
 622         git mv b newname &&
 623         git commit -m "Merge commit C^0 into HEAD" &&
 624         git tag D &&
 625
 626         git checkout -q C^0 &&
 627         git merge --no-commit -s ours B^0 &&
 628         git mv c newname &&
 629         printf "7\n8\n" >>newname &&
 630         git add -u &&
 631         git commit -m "Merge commit B^0 into HEAD" &&
 632         git tag E
 633 '
 634
 635 test_expect_failure 'handle rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 636         git checkout D^0 &&
 637
 638         git merge -s recursive E^0 &&
 639
 640         test 1 -eq $(git ls-files -s | wc -l) &&
 641         test 0 -eq $(git ls-files -u | wc -l) &&
 642         test 0 -eq $(git ls-files -o | wc -l) &&
 643
 644         test $(git rev-parse HEAD:newname) = $(git rev-parse E:newname)
 645 '
 646
 647 #
 648 # criss-cross with rename/rename(1to2)/add-source + resolvable modify/modify:
 649 #
 650 #      B   D
 651 #      o---o
 652 #     / \ / \
 653 #  A o   X   ? F
 654 #     \ / \ /
 655 #      o---o
 656 #      C   E
 657 #
 658 #   Commit A: new file: a
 659 #   Commit B: rename a->b
 660 #   Commit C: rename a->c, add different a
 661 #   Commit D: merge B&C, keeping b&c and (new) a modified at beginning
 662 #   Commit E: merge B&C, keeping b&c and (new) a modified at end
 663 #
 664 # Merging commits D & E should result in no conflict; doing so correctly
 665 # requires getting the virtual merge base (from merging B&C) right, handling
 666 # renaming carefully (both in the virtual merge base and later), and getting
 667 # content merge handled.
 668
 669 test_expect_success 'setup criss-cross + rename/rename/add + modify/modify' '
 670         git rm -rf . &&
 671         git clean -fdqx &&
 672         rm -rf .git &&
 673         git init &&
 674
 675         printf "lots\nof\nwords\nand\ncontent\n" >a &&
 676         git add a &&
 677         git commit -m A &&
 678         git tag A &&
 679
 680         git checkout -b B A &&
 681         git mv a b &&
 682         git commit -m B &&
 683
 684         git checkout -b C A &&
 685         git mv a c &&
 686         printf "2\n3\n4\n5\n6\n7\n" >a &&
 687         git add a &&
 688         git commit -m C &&
 689
 690         git checkout B^0 &&
 691         git merge --no-commit -s ours C^0 &&
 692         git checkout C -- a c &&
 693         mv a old_a &&
 694         echo 1 >a &&
 695         cat old_a >>a &&
 696         rm old_a &&
 697         git add -u &&
 698         git commit -m "Merge commit C^0 into HEAD" &&
 699         git tag D &&
 700
 701         git checkout C^0 &&
 702         git merge --no-commit -s ours B^0 &&
 703         git checkout B -- b &&
 704         echo 8 >>a &&
 705         git add -u &&
 706         git commit -m "Merge commit B^0 into HEAD" &&
 707         git tag E
 708 '
 709
 710 test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
 711         git checkout D^0 &&
 712
 713         git merge -s recursive E^0 &&
 714
 715         test 3 -eq $(git ls-files -s | wc -l) &&
 716         test 0 -eq $(git ls-files -u | wc -l) &&
 717         test 0 -eq $(git ls-files -o | wc -l) &&
 718
 719         test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
 720         test $(git rev-parse HEAD:c) = $(git rev-parse A:a) &&
 721         test "$(cat a)" = "$(printf "1\n2\n3\n4\n5\n6\n7\n8\n")"
 722 '
 723
 724 test_done