Andrew's git / gitweb.git / t/t6036-recursive-corner-cases.sh
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t / t6036-recursive-corner-cases.shon commit Merge branch 'jc/am-i-v-fix' into maint (28eec80)
   1#!/bin/sh
   2
   3test_description='recursive merge corner cases involving criss-cross merges'
   4
   5. ./test-lib.sh
   6
   7get_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
  23test_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
  54test_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 2 = $(git ls-files -s | wc -l) &&
  61        test 2 = $(git ls-files -u | wc -l) &&
  62        test 2 = $(git ls-files -o | wc -l) &&
  63
  64        test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
  65        test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
  66
  67        test $(git rev-parse L2:three) = $(git hash-object three~HEAD) &&
  68        test $(git rev-parse R2:three) = $(git hash-object three~R2^0)
  69'
  70
  71#
  72# Same as before, but modify L1 slightly:
  73#
  74#  L1m L2
  75#   o---o
  76#  / \ / \
  77# o   X   ?
  78#  \ / \ /
  79#   o---o
  80#  R1  R2
  81#
  82
  83test_expect_success 'setup criss-cross + rename merges with basic modification' '
  84        git rm -rf . &&
  85        git clean -fdqx &&
  86        rm -rf .git &&
  87        git init &&
  88
  89        ten="0 1 2 3 4 5 6 7 8 9" &&
  90        for i in $ten
  91        do
  92                echo line $i in a sample file
  93        done >one &&
  94        for i in $ten
  95        do
  96                echo line $i in another sample file
  97        done >two &&
  98        git add one two &&
  99        test_tick && git commit -m initial &&
 100
 101        git branch L1 &&
 102        git checkout -b R1 &&
 103        git mv one three &&
 104        echo more >>two &&
 105        git add two &&
 106        test_tick && git commit -m R1 &&
 107
 108        git checkout L1 &&
 109        git mv two three &&
 110        test_tick && git commit -m L1 &&
 111
 112        git checkout L1^0 &&
 113        test_tick && git merge -s ours R1 &&
 114        git tag L2 &&
 115
 116        git checkout R1^0 &&
 117        test_tick && git merge -s ours L1 &&
 118        git tag R2
 119'
 120
 121test_expect_success 'merge criss-cross + rename merges with basic modification' '
 122        git reset --hard &&
 123        git checkout L2^0 &&
 124
 125        test_must_fail git merge -s recursive R2^0 &&
 126
 127        test 2 = $(git ls-files -s | wc -l) &&
 128        test 2 = $(git ls-files -u | wc -l) &&
 129        test 2 = $(git ls-files -o | wc -l) &&
 130
 131        test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
 132        test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
 133
 134        test $(git rev-parse L2:three) = $(git hash-object three~HEAD) &&
 135        test $(git rev-parse R2:three) = $(git hash-object three~R2^0)
 136'
 137
 138#
 139# For the next test, we start with three commits in two lines of development
 140# which setup a rename/add conflict:
 141#   Commit A: File 'a' exists
 142#   Commit B: Rename 'a' -> 'new_a'
 143#   Commit C: Modify 'a', create different 'new_a'
 144# Later, two different people merge and resolve differently:
 145#   Commit D: Merge B & C, ignoring separately created 'new_a'
 146#   Commit E: Merge B & C making use of some piece of secondary 'new_a'
 147# Finally, someone goes to merge D & E.  Does git detect the conflict?
 148#
 149#      B   D
 150#      o---o
 151#     / \ / \
 152#  A o   X   ? F
 153#     \ / \ /
 154#      o---o
 155#      C   E
 156#
 157
 158test_expect_success 'setup differently handled merges of rename/add conflict' '
 159        git rm -rf . &&
 160        git clean -fdqx &&
 161        rm -rf .git &&
 162        git init &&
 163
 164        printf "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n" >a &&
 165        git add a &&
 166        test_tick && git commit -m A &&
 167
 168        git branch B &&
 169        git checkout -b C &&
 170        echo 10 >>a &&
 171        echo "other content" >>new_a &&
 172        git add a new_a &&
 173        test_tick && git commit -m C &&
 174
 175        git checkout B &&
 176        git mv a new_a &&
 177        test_tick && git commit -m B &&
 178
 179        git checkout B^0 &&
 180        test_must_fail git merge C &&
 181        git clean -f &&
 182        test_tick && git commit -m D &&
 183        git tag D &&
 184
 185        git checkout C^0 &&
 186        test_must_fail git merge B &&
 187        rm new_a~HEAD new_a &&
 188        printf "Incorrectly merged content" >>new_a &&
 189        git add -u &&
 190        test_tick && git commit -m E &&
 191        git tag E
 192'
 193
 194test_expect_success 'git detects differently handled merges conflict' '
 195        git reset --hard &&
 196        git checkout D^0 &&
 197
 198        test_must_fail git merge -s recursive E^0 &&
 199
 200        test 3 = $(git ls-files -s | wc -l) &&
 201        test 3 = $(git ls-files -u | wc -l) &&
 202        test 0 = $(git ls-files -o | wc -l) &&
 203
 204        test $(git rev-parse :2:new_a) = $(git rev-parse D:new_a) &&
 205        test $(git rev-parse :3:new_a) = $(git rev-parse E:new_a) &&
 206
 207        git cat-file -p B:new_a >>merged &&
 208        git cat-file -p C:new_a >>merge-me &&
 209        >empty &&
 210        test_must_fail git merge-file \
 211                -L "Temporary merge branch 2" \
 212                -L "" \
 213                -L "Temporary merge branch 1" \
 214                merged empty merge-me &&
 215        test $(git rev-parse :1:new_a) = $(git hash-object merged)
 216'
 217
 218#
 219# criss-cross + modify/delete:
 220#
 221#      B   D
 222#      o---o
 223#     / \ / \
 224#  A o   X   ? F
 225#     \ / \ /
 226#      o---o
 227#      C   E
 228#
 229#   Commit A: file with contents 'A\n'
 230#   Commit B: file with contents 'B\n'
 231#   Commit C: file not present
 232#   Commit D: file with contents 'B\n'
 233#   Commit E: file not present
 234#
 235# Merging commits D & E should result in modify/delete conflict.
 236
 237test_expect_success 'setup criss-cross + modify/delete resolved differently' '
 238        git rm -rf . &&
 239        git clean -fdqx &&
 240        rm -rf .git &&
 241        git init &&
 242
 243        echo A >file &&
 244        git add file &&
 245        test_tick &&
 246        git commit -m A &&
 247
 248        git branch B &&
 249        git checkout -b C &&
 250        git rm file &&
 251        test_tick &&
 252        git commit -m C &&
 253
 254        git checkout B &&
 255        echo B >file &&
 256        git add file &&
 257        test_tick &&
 258        git commit -m B &&
 259
 260        git checkout B^0 &&
 261        test_must_fail git merge C &&
 262        echo B >file &&
 263        git add file &&
 264        test_tick &&
 265        git commit -m D &&
 266        git tag D &&
 267
 268        git checkout C^0 &&
 269        test_must_fail git merge B &&
 270        git rm file &&
 271        test_tick &&
 272        git commit -m E &&
 273        git tag E
 274'
 275
 276test_expect_success 'git detects conflict merging criss-cross+modify/delete' '
 277        git checkout D^0 &&
 278
 279        test_must_fail git merge -s recursive E^0 &&
 280
 281        test 2 -eq $(git ls-files -s | wc -l) &&
 282        test 2 -eq $(git ls-files -u | wc -l) &&
 283
 284        test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 285        test $(git rev-parse :2:file) = $(git rev-parse B:file)
 286'
 287
 288test_expect_success 'git detects conflict merging criss-cross+modify/delete, reverse direction' '
 289        git reset --hard &&
 290        git checkout E^0 &&
 291
 292        test_must_fail git merge -s recursive D^0 &&
 293
 294        test 2 -eq $(git ls-files -s | wc -l) &&
 295        test 2 -eq $(git ls-files -u | wc -l) &&
 296
 297        test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 298        test $(git rev-parse :3:file) = $(git rev-parse B:file)
 299'
 300
 301#
 302# criss-cross + modify/modify with very contrived file contents:
 303#
 304#      B   D
 305#      o---o
 306#     / \ / \
 307#  A o   X   ? F
 308#     \ / \ /
 309#      o---o
 310#      C   E
 311#
 312#   Commit A: file with contents 'A\n'
 313#   Commit B: file with contents 'B\n'
 314#   Commit C: file with contents 'C\n'
 315#   Commit D: file with contents 'D\n'
 316#   Commit E: file with contents:
 317#      <<<<<<< Temporary merge branch 1
 318#      C
 319#      =======
 320#      B
 321#      >>>>>>> Temporary merge branch 2
 322#
 323# Now, when we merge commits D & E, does git detect the conflict?
 324
 325test_expect_success 'setup differently handled merges of content conflict' '
 326        git clean -fdqx &&
 327        rm -rf .git &&
 328        git init &&
 329
 330        echo A >file &&
 331        git add file &&
 332        test_tick &&
 333        git commit -m A &&
 334
 335        git branch B &&
 336        git checkout -b C &&
 337        echo C >file &&
 338        git add file &&
 339        test_tick &&
 340        git commit -m C &&
 341
 342        git checkout B &&
 343        echo B >file &&
 344        git add file &&
 345        test_tick &&
 346        git commit -m B &&
 347
 348        git checkout B^0 &&
 349        test_must_fail git merge C &&
 350        echo D >file &&
 351        git add file &&
 352        test_tick &&
 353        git commit -m D &&
 354        git tag D &&
 355
 356        git checkout C^0 &&
 357        test_must_fail git merge B &&
 358        cat <<EOF >file &&
 359<<<<<<< Temporary merge branch 1
 360C
 361=======
 362B
 363>>>>>>> Temporary merge branch 2
 364EOF
 365        git add file &&
 366        test_tick &&
 367        git commit -m E &&
 368        git tag E
 369'
 370
 371test_expect_failure 'git detects conflict w/ criss-cross+contrived resolution' '
 372        git checkout D^0 &&
 373
 374        test_must_fail git merge -s recursive E^0 &&
 375
 376        test 3 -eq $(git ls-files -s | wc -l) &&
 377        test 3 -eq $(git ls-files -u | wc -l) &&
 378        test 0 -eq $(git ls-files -o | wc -l) &&
 379
 380        test $(git rev-parse :2:file) = $(git rev-parse D:file) &&
 381        test $(git rev-parse :3:file) = $(git rev-parse E:file)
 382'
 383
 384#
 385# criss-cross + d/f conflict via add/add:
 386#   Commit A: Neither file 'a' nor directory 'a/' exists.
 387#   Commit B: Introduce 'a'
 388#   Commit C: Introduce 'a/file'
 389#   Commit D: Merge B & C, keeping 'a' and deleting 'a/'
 390#
 391# Two different later cases:
 392#   Commit E1: Merge B & C, deleting 'a' but keeping 'a/file'
 393#   Commit E2: Merge B & C, deleting 'a' but keeping a slightly modified 'a/file'
 394#
 395#      B   D
 396#      o---o
 397#     / \ / \
 398#  A o   X   ? F
 399#     \ / \ /
 400#      o---o
 401#      C   E1 or E2
 402#
 403# Merging D & E1 requires we first create a virtual merge base X from
 404# merging A & B in memory.  Now, if X could keep both 'a' and 'a/file' in
 405# the index, then the merge of D & E1 could be resolved cleanly with both
 406# 'a' and 'a/file' removed.  Since git does not currently allow creating
 407# such a tree, the best we can do is have X contain both 'a~<unique>' and
 408# 'a/file' resulting in the merge of D and E1 having a rename/delete
 409# conflict for 'a'.  (Although this merge appears to be unsolvable with git
 410# currently, git could do a lot better than it currently does with these
 411# d/f conflicts, which is the purpose of this test.)
 412#
 413# Merge of D & E2 has similar issues for path 'a', but should always result
 414# in a modify/delete conflict for path 'a/file'.
 415#
 416# We run each merge in both directions, to check for directional issues
 417# with D/F conflict handling.
 418#
 419
 420test_expect_success 'setup differently handled merges of directory/file conflict' '
 421        git rm -rf . &&
 422        git clean -fdqx &&
 423        rm -rf .git &&
 424        git init &&
 425
 426        >ignore-me &&
 427        git add ignore-me &&
 428        test_tick &&
 429        git commit -m A &&
 430        git tag A &&
 431
 432        git branch B &&
 433        git checkout -b C &&
 434        mkdir a &&
 435        echo 10 >a/file &&
 436        git add a/file &&
 437        test_tick &&
 438        git commit -m C &&
 439
 440        git checkout B &&
 441        echo 5 >a &&
 442        git add a &&
 443        test_tick &&
 444        git commit -m B &&
 445
 446        git checkout B^0 &&
 447        test_must_fail git merge C &&
 448        git clean -f &&
 449        rm -rf a/ &&
 450        echo 5 >a &&
 451        git add a &&
 452        test_tick &&
 453        git commit -m D &&
 454        git tag D &&
 455
 456        git checkout C^0 &&
 457        test_must_fail git merge B &&
 458        git clean -f &&
 459        git rm --cached a &&
 460        echo 10 >a/file &&
 461        git add a/file &&
 462        test_tick &&
 463        git commit -m E1 &&
 464        git tag E1 &&
 465
 466        git checkout C^0 &&
 467        test_must_fail git merge B &&
 468        git clean -f &&
 469        git rm --cached a &&
 470        printf "10\n11\n" >a/file &&
 471        git add a/file &&
 472        test_tick &&
 473        git commit -m E2 &&
 474        git tag E2
 475'
 476
 477test_expect_success 'merge of D & E1 fails but has appropriate contents' '
 478        get_clean_checkout D^0 &&
 479
 480        test_must_fail git merge -s recursive E1^0 &&
 481
 482        test 2 -eq $(git ls-files -s | wc -l) &&
 483        test 1 -eq $(git ls-files -u | wc -l) &&
 484        test 0 -eq $(git ls-files -o | wc -l) &&
 485
 486        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 487        test $(git rev-parse :2:a) = $(git rev-parse B:a)
 488'
 489
 490test_expect_success 'merge of E1 & D fails but has appropriate contents' '
 491        get_clean_checkout E1^0 &&
 492
 493        test_must_fail git merge -s recursive D^0 &&
 494
 495        test 2 -eq $(git ls-files -s | wc -l) &&
 496        test 1 -eq $(git ls-files -u | wc -l) &&
 497        test 0 -eq $(git ls-files -o | wc -l) &&
 498
 499        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 500        test $(git rev-parse :3:a) = $(git rev-parse B:a)
 501'
 502
 503test_expect_success 'merge of D & E2 fails but has appropriate contents' '
 504        get_clean_checkout D^0 &&
 505
 506        test_must_fail git merge -s recursive E2^0 &&
 507
 508        test 4 -eq $(git ls-files -s | wc -l) &&
 509        test 3 -eq $(git ls-files -u | wc -l) &&
 510        test 1 -eq $(git ls-files -o | wc -l) &&
 511
 512        test $(git rev-parse :2:a) = $(git rev-parse B:a) &&
 513        test $(git rev-parse :3:a/file) = $(git rev-parse E2:a/file) &&
 514        test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
 515        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 516
 517        test -f a~HEAD
 518'
 519
 520test_expect_success 'merge of E2 & D fails but has appropriate contents' '
 521        get_clean_checkout E2^0 &&
 522
 523        test_must_fail git merge -s recursive D^0 &&
 524
 525        test 4 -eq $(git ls-files -s | wc -l) &&
 526        test 3 -eq $(git ls-files -u | wc -l) &&
 527        test 1 -eq $(git ls-files -o | wc -l) &&
 528
 529        test $(git rev-parse :3:a) = $(git rev-parse B:a) &&
 530        test $(git rev-parse :2:a/file) = $(git rev-parse E2:a/file) &&
 531        test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
 532        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 533
 534        test -f a~D^0
 535'
 536
 537#
 538# criss-cross with rename/rename(1to2)/modify followed by
 539# rename/rename(2to1)/modify:
 540#
 541#      B   D
 542#      o---o
 543#     / \ / \
 544#  A o   X   ? F
 545#     \ / \ /
 546#      o---o
 547#      C   E
 548#
 549#   Commit A: new file: a
 550#   Commit B: rename a->b, modifying by adding a line
 551#   Commit C: rename a->c
 552#   Commit D: merge B&C, resolving conflict by keeping contents in newname
 553#   Commit E: merge B&C, resolving conflict similar to D but adding another line
 554#
 555# There is a conflict merging B & C, but one of filename not of file
 556# content.  Whoever created D and E chose specific resolutions for that
 557# conflict resolution.  Now, since: (1) there is no content conflict
 558# merging B & C, (2) D does not modify that merged content further, and (3)
 559# both D & E resolve the name conflict in the same way, the modification to
 560# newname in E should not cause any conflicts when it is merged with D.
 561# (Note that this can be accomplished by having the virtual merge base have
 562# the merged contents of b and c stored in a file named a, which seems like
 563# the most logical choice anyway.)
 564#
 565# Comment from Junio: I do not necessarily agree with the choice "a", but
 566# it feels sound to say "B and C do not agree what the final pathname
 567# should be, but we know this content was derived from the common A:a so we
 568# use one path whose name is arbitrary in the virtual merge base X between
 569# D and E" and then further let the rename detection to notice that that
 570# arbitrary path gets renamed between X-D to "newname" and X-E also to
 571# "newname" to resolve it as both sides renaming it to the same new
 572# name. It is akin to what we do at the content level, i.e. "B and C do not
 573# agree what the final contents should be, so we leave the conflict marker
 574# but that may cancel out at the final merge stage".
 575
 576test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 577        git reset --hard &&
 578        git rm -rf . &&
 579        git clean -fdqx &&
 580        rm -rf .git &&
 581        git init &&
 582
 583        printf "1\n2\n3\n4\n5\n6\n" >a &&
 584        git add a &&
 585        git commit -m A &&
 586        git tag A &&
 587
 588        git checkout -b B A &&
 589        git mv a b &&
 590        echo 7 >>b &&
 591        git add -u &&
 592        git commit -m B &&
 593
 594        git checkout -b C A &&
 595        git mv a c &&
 596        git commit -m C &&
 597
 598        git checkout -q B^0 &&
 599        git merge --no-commit -s ours C^0 &&
 600        git mv b newname &&
 601        git commit -m "Merge commit C^0 into HEAD" &&
 602        git tag D &&
 603
 604        git checkout -q C^0 &&
 605        git merge --no-commit -s ours B^0 &&
 606        git mv c newname &&
 607        printf "7\n8\n" >>newname &&
 608        git add -u &&
 609        git commit -m "Merge commit B^0 into HEAD" &&
 610        git tag E
 611'
 612
 613test_expect_success 'handle rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 614        git checkout D^0 &&
 615
 616        git merge -s recursive E^0 &&
 617
 618        test 1 -eq $(git ls-files -s | wc -l) &&
 619        test 0 -eq $(git ls-files -u | wc -l) &&
 620        test 0 -eq $(git ls-files -o | wc -l) &&
 621
 622        test $(git rev-parse HEAD:newname) = $(git rev-parse E:newname)
 623'
 624
 625#
 626# criss-cross with rename/rename(1to2)/add-source + resolvable modify/modify:
 627#
 628#      B   D
 629#      o---o
 630#     / \ / \
 631#  A o   X   ? F
 632#     \ / \ /
 633#      o---o
 634#      C   E
 635#
 636#   Commit A: new file: a
 637#   Commit B: rename a->b
 638#   Commit C: rename a->c, add different a
 639#   Commit D: merge B&C, keeping b&c and (new) a modified at beginning
 640#   Commit E: merge B&C, keeping b&c and (new) a modified at end
 641#
 642# Merging commits D & E should result in no conflict; doing so correctly
 643# requires getting the virtual merge base (from merging B&C) right, handling
 644# renaming carefully (both in the virtual merge base and later), and getting
 645# content merge handled.
 646
 647test_expect_success 'setup criss-cross + rename/rename/add + modify/modify' '
 648        git rm -rf . &&
 649        git clean -fdqx &&
 650        rm -rf .git &&
 651        git init &&
 652
 653        printf "lots\nof\nwords\nand\ncontent\n" >a &&
 654        git add a &&
 655        git commit -m A &&
 656        git tag A &&
 657
 658        git checkout -b B A &&
 659        git mv a b &&
 660        git commit -m B &&
 661
 662        git checkout -b C A &&
 663        git mv a c &&
 664        printf "2\n3\n4\n5\n6\n7\n" >a &&
 665        git add a &&
 666        git commit -m C &&
 667
 668        git checkout B^0 &&
 669        git merge --no-commit -s ours C^0 &&
 670        git checkout C -- a c &&
 671        mv a old_a &&
 672        echo 1 >a &&
 673        cat old_a >>a &&
 674        rm old_a &&
 675        git add -u &&
 676        git commit -m "Merge commit C^0 into HEAD" &&
 677        git tag D &&
 678
 679        git checkout C^0 &&
 680        git merge --no-commit -s ours B^0 &&
 681        git checkout B -- b &&
 682        echo 8 >>a &&
 683        git add -u &&
 684        git commit -m "Merge commit B^0 into HEAD" &&
 685        git tag E
 686'
 687
 688test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
 689        git checkout D^0 &&
 690
 691        git merge -s recursive E^0 &&
 692
 693        test 3 -eq $(git ls-files -s | wc -l) &&
 694        test 0 -eq $(git ls-files -u | wc -l) &&
 695        test 0 -eq $(git ls-files -o | wc -l) &&
 696
 697        test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
 698        test $(git rev-parse HEAD:c) = $(git rev-parse A:a) &&
 699        test "$(cat a)" = "$(printf "1\n2\n3\n4\n5\n6\n7\n8\n")"
 700'
 701
 702#
 703# criss-cross with rename/rename(1to2)/add-dest + simple modify:
 704#
 705#      B   D
 706#      o---o
 707#     / \ / \
 708#  A o   X   ? F
 709#     \ / \ /
 710#      o---o
 711#      C   E
 712#
 713#   Commit A: new file: a
 714#   Commit B: rename a->b, add c
 715#   Commit C: rename a->c
 716#   Commit D: merge B&C, keeping A:a and B:c
 717#   Commit E: merge B&C, keeping A:a and slightly modified c from B
 718#
 719# Merging commits D & E should result in no conflict.  The virtual merge
 720# base of B & C needs to not delete B:c for that to work, though...
 721
 722test_expect_success 'setup criss-cross+rename/rename/add-dest + simple modify' '
 723        git rm -rf . &&
 724        git clean -fdqx &&
 725        rm -rf .git &&
 726        git init &&
 727
 728        >a &&
 729        git add a &&
 730        git commit -m A &&
 731        git tag A &&
 732
 733        git checkout -b B A &&
 734        git mv a b &&
 735        printf "1\n2\n3\n4\n5\n6\n7\n" >c &&
 736        git add c &&
 737        git commit -m B &&
 738
 739        git checkout -b C A &&
 740        git mv a c &&
 741        git commit -m C &&
 742
 743        git checkout B^0 &&
 744        git merge --no-commit -s ours C^0 &&
 745        git mv b a &&
 746        git commit -m "D is like B but renames b back to a" &&
 747        git tag D &&
 748
 749        git checkout B^0 &&
 750        git merge --no-commit -s ours C^0 &&
 751        git mv b a &&
 752        echo 8 >>c &&
 753        git add c &&
 754        git commit -m "E like D but has mod in c" &&
 755        git tag E
 756'
 757
 758test_expect_success 'virtual merge base handles rename/rename(1to2)/add-dest' '
 759        git checkout D^0 &&
 760
 761        git merge -s recursive E^0 &&
 762
 763        test 2 -eq $(git ls-files -s | wc -l) &&
 764        test 0 -eq $(git ls-files -u | wc -l) &&
 765        test 0 -eq $(git ls-files -o | wc -l) &&
 766
 767        test $(git rev-parse HEAD:a) = $(git rev-parse A:a) &&
 768        test $(git rev-parse HEAD:c) = $(git rev-parse E:c)
 769'
 770
 771test_done