Andrew's git / gitweb.git / t/t6036-recursive-corner-cases.sh
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t / t6036-recursive-corner-cases.shon commit Start 1.8.2 cycle (298caa7)
   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        git merge -s recursive E^0 && {
 199                echo "BAD: should have conflicted"
 200                test "Incorrectly merged content" = "$(cat new_a)" &&
 201                        echo "BAD: Silently accepted wrong content"
 202                return 1
 203        }
 204
 205        test 3 = $(git ls-files -s | wc -l) &&
 206        test 3 = $(git ls-files -u | wc -l) &&
 207        test 0 = $(git ls-files -o | wc -l) &&
 208
 209        test $(git rev-parse :2:new_a) = $(git rev-parse D:new_a) &&
 210        test $(git rev-parse :3:new_a) = $(git rev-parse E:new_a) &&
 211
 212        git cat-file -p B:new_a >>merged &&
 213        git cat-file -p C:new_a >>merge-me &&
 214        >empty &&
 215        test_must_fail git merge-file \
 216                -L "Temporary merge branch 2" \
 217                -L "" \
 218                -L "Temporary merge branch 1" \
 219                merged empty merge-me &&
 220        test $(git rev-parse :1:new_a) = $(git hash-object merged)
 221'
 222
 223#
 224# criss-cross + modify/delete:
 225#
 226#      B   D
 227#      o---o
 228#     / \ / \
 229#  A o   X   ? F
 230#     \ / \ /
 231#      o---o
 232#      C   E
 233#
 234#   Commit A: file with contents 'A\n'
 235#   Commit B: file with contents 'B\n'
 236#   Commit C: file not present
 237#   Commit D: file with contents 'B\n'
 238#   Commit E: file not present
 239#
 240# Merging commits D & E should result in modify/delete conflict.
 241
 242test_expect_success 'setup criss-cross + modify/delete resolved differently' '
 243        git rm -rf . &&
 244        git clean -fdqx &&
 245        rm -rf .git &&
 246        git init &&
 247
 248        echo A >file &&
 249        git add file &&
 250        test_tick &&
 251        git commit -m A &&
 252
 253        git branch B &&
 254        git checkout -b C &&
 255        git rm file &&
 256        test_tick &&
 257        git commit -m C &&
 258
 259        git checkout B &&
 260        echo B >file &&
 261        git add file &&
 262        test_tick &&
 263        git commit -m B &&
 264
 265        git checkout B^0 &&
 266        test_must_fail git merge C &&
 267        echo B >file &&
 268        git add file &&
 269        test_tick &&
 270        git commit -m D &&
 271        git tag D &&
 272
 273        git checkout C^0 &&
 274        test_must_fail git merge B &&
 275        git rm file &&
 276        test_tick &&
 277        git commit -m E &&
 278        git tag E
 279'
 280
 281test_expect_success 'git detects conflict merging criss-cross+modify/delete' '
 282        git checkout D^0 &&
 283
 284        test_must_fail git merge -s recursive E^0 &&
 285
 286        test 2 -eq $(git ls-files -s | wc -l) &&
 287        test 2 -eq $(git ls-files -u | wc -l) &&
 288
 289        test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 290        test $(git rev-parse :2:file) = $(git rev-parse B:file)
 291'
 292
 293test_expect_success 'git detects conflict merging criss-cross+modify/delete, reverse direction' '
 294        git reset --hard &&
 295        git checkout E^0 &&
 296
 297        test_must_fail git merge -s recursive D^0 &&
 298
 299        test 2 -eq $(git ls-files -s | wc -l) &&
 300        test 2 -eq $(git ls-files -u | wc -l) &&
 301
 302        test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 303        test $(git rev-parse :3:file) = $(git rev-parse B:file)
 304'
 305
 306#
 307# criss-cross + modify/modify with very contrived file contents:
 308#
 309#      B   D
 310#      o---o
 311#     / \ / \
 312#  A o   X   ? F
 313#     \ / \ /
 314#      o---o
 315#      C   E
 316#
 317#   Commit A: file with contents 'A\n'
 318#   Commit B: file with contents 'B\n'
 319#   Commit C: file with contents 'C\n'
 320#   Commit D: file with contents 'D\n'
 321#   Commit E: file with contents:
 322#      <<<<<<< Temporary merge branch 1
 323#      C
 324#      =======
 325#      B
 326#      >>>>>>> Temporary merge branch 2
 327#
 328# Now, when we merge commits D & E, does git detect the conflict?
 329
 330test_expect_success 'setup differently handled merges of content conflict' '
 331        git clean -fdqx &&
 332        rm -rf .git &&
 333        git init &&
 334
 335        echo A >file &&
 336        git add file &&
 337        test_tick &&
 338        git commit -m A &&
 339
 340        git branch B &&
 341        git checkout -b C &&
 342        echo C >file &&
 343        git add file &&
 344        test_tick &&
 345        git commit -m C &&
 346
 347        git checkout B &&
 348        echo B >file &&
 349        git add file &&
 350        test_tick &&
 351        git commit -m B &&
 352
 353        git checkout B^0 &&
 354        test_must_fail git merge C &&
 355        echo D >file &&
 356        git add file &&
 357        test_tick &&
 358        git commit -m D &&
 359        git tag D &&
 360
 361        git checkout C^0 &&
 362        test_must_fail git merge B &&
 363        cat <<EOF >file &&
 364<<<<<<< Temporary merge branch 1
 365C
 366=======
 367B
 368>>>>>>> Temporary merge branch 2
 369EOF
 370        git add file &&
 371        test_tick &&
 372        git commit -m E &&
 373        git tag E
 374'
 375
 376test_expect_failure 'git detects conflict w/ criss-cross+contrived resolution' '
 377        git checkout D^0 &&
 378
 379        test_must_fail git merge -s recursive E^0 &&
 380
 381        test 3 -eq $(git ls-files -s | wc -l) &&
 382        test 3 -eq $(git ls-files -u | wc -l) &&
 383        test 0 -eq $(git ls-files -o | wc -l) &&
 384
 385        test $(git rev-parse :2:file) = $(git rev-parse D:file) &&
 386        test $(git rev-parse :3:file) = $(git rev-parse E:file)
 387'
 388
 389#
 390# criss-cross + d/f conflict via add/add:
 391#   Commit A: Neither file 'a' nor directory 'a/' exist.
 392#   Commit B: Introduce 'a'
 393#   Commit C: Introduce 'a/file'
 394#   Commit D: Merge B & C, keeping 'a' and deleting 'a/'
 395#
 396# Two different later cases:
 397#   Commit E1: Merge B & C, deleting 'a' but keeping 'a/file'
 398#   Commit E2: Merge B & C, deleting 'a' but keeping a slightly modified 'a/file'
 399#
 400#      B   D
 401#      o---o
 402#     / \ / \
 403#  A o   X   ? F
 404#     \ / \ /
 405#      o---o
 406#      C   E1 or E2
 407#
 408# Merging D & E1 requires we first create a virtual merge base X from
 409# merging A & B in memory.  Now, if X could keep both 'a' and 'a/file' in
 410# the index, then the merge of D & E1 could be resolved cleanly with both
 411# 'a' and 'a/file' removed.  Since git does not currently allow creating
 412# such a tree, the best we can do is have X contain both 'a~<unique>' and
 413# 'a/file' resulting in the merge of D and E1 having a rename/delete
 414# conflict for 'a'.  (Although this merge appears to be unsolvable with git
 415# currently, git could do a lot better than it currently does with these
 416# d/f conflicts, which is the purpose of this test.)
 417#
 418# Merge of D & E2 has similar issues for path 'a', but should always result
 419# in a modify/delete conflict for path 'a/file'.
 420#
 421# We run each merge in both directions, to check for directional issues
 422# with D/F conflict handling.
 423#
 424
 425test_expect_success 'setup differently handled merges of directory/file conflict' '
 426        git rm -rf . &&
 427        git clean -fdqx &&
 428        rm -rf .git &&
 429        git init &&
 430
 431        >ignore-me &&
 432        git add ignore-me &&
 433        test_tick &&
 434        git commit -m A &&
 435        git tag A &&
 436
 437        git branch B &&
 438        git checkout -b C &&
 439        mkdir a &&
 440        echo 10 >a/file &&
 441        git add a/file &&
 442        test_tick &&
 443        git commit -m C &&
 444
 445        git checkout B &&
 446        echo 5 >a &&
 447        git add a &&
 448        test_tick &&
 449        git commit -m B &&
 450
 451        git checkout B^0 &&
 452        test_must_fail git merge C &&
 453        git clean -f &&
 454        rm -rf a/ &&
 455        echo 5 >a &&
 456        git add a &&
 457        test_tick &&
 458        git commit -m D &&
 459        git tag D &&
 460
 461        git checkout C^0 &&
 462        test_must_fail git merge B &&
 463        git clean -f &&
 464        git rm --cached a &&
 465        echo 10 >a/file &&
 466        git add a/file &&
 467        test_tick &&
 468        git commit -m E1 &&
 469        git tag E1 &&
 470
 471        git checkout C^0 &&
 472        test_must_fail git merge B &&
 473        git clean -f &&
 474        git rm --cached a &&
 475        printf "10\n11\n" >a/file &&
 476        git add a/file &&
 477        test_tick &&
 478        git commit -m E2 &&
 479        git tag E2
 480'
 481
 482test_expect_success 'merge of D & E1 fails but has appropriate contents' '
 483        get_clean_checkout D^0 &&
 484
 485        test_must_fail git merge -s recursive E1^0 &&
 486
 487        test 2 -eq $(git ls-files -s | wc -l) &&
 488        test 1 -eq $(git ls-files -u | wc -l) &&
 489        test 0 -eq $(git ls-files -o | wc -l) &&
 490
 491        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 492        test $(git rev-parse :2:a) = $(git rev-parse B:a)
 493'
 494
 495test_expect_success 'merge of E1 & D fails but has appropriate contents' '
 496        get_clean_checkout E1^0 &&
 497
 498        test_must_fail git merge -s recursive D^0 &&
 499
 500        test 2 -eq $(git ls-files -s | wc -l) &&
 501        test 1 -eq $(git ls-files -u | wc -l) &&
 502        test 0 -eq $(git ls-files -o | wc -l) &&
 503
 504        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 505        test $(git rev-parse :3:a) = $(git rev-parse B:a)
 506'
 507
 508test_expect_success 'merge of D & E2 fails but has appropriate contents' '
 509        get_clean_checkout D^0 &&
 510
 511        test_must_fail git merge -s recursive E2^0 &&
 512
 513        test 4 -eq $(git ls-files -s | wc -l) &&
 514        test 3 -eq $(git ls-files -u | wc -l) &&
 515        test 1 -eq $(git ls-files -o | wc -l) &&
 516
 517        test $(git rev-parse :2:a) = $(git rev-parse B:a) &&
 518        test $(git rev-parse :3:a/file) = $(git rev-parse E2:a/file) &&
 519        test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
 520        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 521
 522        test -f a~HEAD
 523'
 524
 525test_expect_success 'merge of E2 & D fails but has appropriate contents' '
 526        get_clean_checkout E2^0 &&
 527
 528        test_must_fail git merge -s recursive D^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 :3:a) = $(git rev-parse B:a) &&
 535        test $(git rev-parse :2: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~D^0
 540'
 541
 542#
 543# criss-cross with rename/rename(1to2)/modify followed by
 544# rename/rename(2to1)/modify:
 545#
 546#      B   D
 547#      o---o
 548#     / \ / \
 549#  A o   X   ? F
 550#     \ / \ /
 551#      o---o
 552#      C   E
 553#
 554#   Commit A: new file: a
 555#   Commit B: rename a->b, modifying by adding a line
 556#   Commit C: rename a->c
 557#   Commit D: merge B&C, resolving conflict by keeping contents in newname
 558#   Commit E: merge B&C, resolving conflict similar to D but adding another line
 559#
 560# There is a conflict merging B & C, but one of filename not of file
 561# content.  Whoever created D and E chose specific resolutions for that
 562# conflict resolution.  Now, since: (1) there is no content conflict
 563# merging B & C, (2) D does not modify that merged content further, and (3)
 564# both D & E resolve the name conflict in the same way, the modification to
 565# newname in E should not cause any conflicts when it is merged with D.
 566# (Note that this can be accomplished by having the virtual merge base have
 567# the merged contents of b and c stored in a file named a, which seems like
 568# the most logical choice anyway.)
 569#
 570# Comment from Junio: I do not necessarily agree with the choice "a", but
 571# it feels sound to say "B and C do not agree what the final pathname
 572# should be, but we know this content was derived from the common A:a so we
 573# use one path whose name is arbitrary in the virtual merge base X between
 574# D and E" and then further let the rename detection to notice that that
 575# arbitrary path gets renamed between X-D to "newname" and X-E also to
 576# "newname" to resolve it as both sides renaming it to the same new
 577# name. It is akin to what we do at the content level, i.e. "B and C do not
 578# agree what the final contents should be, so we leave the conflict marker
 579# but that may cancel out at the final merge stage".
 580
 581test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 582        git reset --hard &&
 583        git rm -rf . &&
 584        git clean -fdqx &&
 585        rm -rf .git &&
 586        git init &&
 587
 588        printf "1\n2\n3\n4\n5\n6\n" >a &&
 589        git add a &&
 590        git commit -m A &&
 591        git tag A &&
 592
 593        git checkout -b B A &&
 594        git mv a b &&
 595        echo 7 >>b &&
 596        git add -u &&
 597        git commit -m B &&
 598
 599        git checkout -b C A &&
 600        git mv a c &&
 601        git commit -m C &&
 602
 603        git checkout -q B^0 &&
 604        git merge --no-commit -s ours C^0 &&
 605        git mv b newname &&
 606        git commit -m "Merge commit C^0 into HEAD" &&
 607        git tag D &&
 608
 609        git checkout -q C^0 &&
 610        git merge --no-commit -s ours B^0 &&
 611        git mv c newname &&
 612        printf "7\n8\n" >>newname &&
 613        git add -u &&
 614        git commit -m "Merge commit B^0 into HEAD" &&
 615        git tag E
 616'
 617
 618test_expect_success 'handle rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 619        git checkout D^0 &&
 620
 621        git merge -s recursive E^0 &&
 622
 623        test 1 -eq $(git ls-files -s | wc -l) &&
 624        test 0 -eq $(git ls-files -u | wc -l) &&
 625        test 0 -eq $(git ls-files -o | wc -l) &&
 626
 627        test $(git rev-parse HEAD:newname) = $(git rev-parse E:newname)
 628'
 629
 630#
 631# criss-cross with rename/rename(1to2)/add-source + resolvable modify/modify:
 632#
 633#      B   D
 634#      o---o
 635#     / \ / \
 636#  A o   X   ? F
 637#     \ / \ /
 638#      o---o
 639#      C   E
 640#
 641#   Commit A: new file: a
 642#   Commit B: rename a->b
 643#   Commit C: rename a->c, add different a
 644#   Commit D: merge B&C, keeping b&c and (new) a modified at beginning
 645#   Commit E: merge B&C, keeping b&c and (new) a modified at end
 646#
 647# Merging commits D & E should result in no conflict; doing so correctly
 648# requires getting the virtual merge base (from merging B&C) right, handling
 649# renaming carefully (both in the virtual merge base and later), and getting
 650# content merge handled.
 651
 652test_expect_success 'setup criss-cross + rename/rename/add + modify/modify' '
 653        git rm -rf . &&
 654        git clean -fdqx &&
 655        rm -rf .git &&
 656        git init &&
 657
 658        printf "lots\nof\nwords\nand\ncontent\n" >a &&
 659        git add a &&
 660        git commit -m A &&
 661        git tag A &&
 662
 663        git checkout -b B A &&
 664        git mv a b &&
 665        git commit -m B &&
 666
 667        git checkout -b C A &&
 668        git mv a c &&
 669        printf "2\n3\n4\n5\n6\n7\n" >a &&
 670        git add a &&
 671        git commit -m C &&
 672
 673        git checkout B^0 &&
 674        git merge --no-commit -s ours C^0 &&
 675        git checkout C -- a c &&
 676        mv a old_a &&
 677        echo 1 >a &&
 678        cat old_a >>a &&
 679        rm old_a &&
 680        git add -u &&
 681        git commit -m "Merge commit C^0 into HEAD" &&
 682        git tag D &&
 683
 684        git checkout C^0 &&
 685        git merge --no-commit -s ours B^0 &&
 686        git checkout B -- b &&
 687        echo 8 >>a &&
 688        git add -u &&
 689        git commit -m "Merge commit B^0 into HEAD" &&
 690        git tag E
 691'
 692
 693test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
 694        git checkout D^0 &&
 695
 696        git merge -s recursive E^0 &&
 697
 698        test 3 -eq $(git ls-files -s | wc -l) &&
 699        test 0 -eq $(git ls-files -u | wc -l) &&
 700        test 0 -eq $(git ls-files -o | wc -l) &&
 701
 702        test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
 703        test $(git rev-parse HEAD:c) = $(git rev-parse A:a) &&
 704        test "$(cat a)" = "$(printf "1\n2\n3\n4\n5\n6\n7\n8\n")"
 705'
 706
 707#
 708# criss-cross with rename/rename(1to2)/add-dest + simple modify:
 709#
 710#      B   D
 711#      o---o
 712#     / \ / \
 713#  A o   X   ? F
 714#     \ / \ /
 715#      o---o
 716#      C   E
 717#
 718#   Commit A: new file: a
 719#   Commit B: rename a->b, add c
 720#   Commit C: rename a->c
 721#   Commit D: merge B&C, keeping A:a and B:c
 722#   Commit E: merge B&C, keeping A:a and slightly modified c from B
 723#
 724# Merging commits D & E should result in no conflict.  The virtual merge
 725# base of B & C needs to not delete B:c for that to work, though...
 726
 727test_expect_success 'setup criss-cross+rename/rename/add-dest + simple modify' '
 728        git rm -rf . &&
 729        git clean -fdqx &&
 730        rm -rf .git &&
 731        git init &&
 732
 733        >a &&
 734        git add a &&
 735        git commit -m A &&
 736        git tag A &&
 737
 738        git checkout -b B A &&
 739        git mv a b &&
 740        printf "1\n2\n3\n4\n5\n6\n7\n" >c &&
 741        git add c &&
 742        git commit -m B &&
 743
 744        git checkout -b C A &&
 745        git mv a c &&
 746        git commit -m C &&
 747
 748        git checkout B^0 &&
 749        git merge --no-commit -s ours C^0 &&
 750        git mv b a &&
 751        git commit -m "D is like B but renames b back to a" &&
 752        git tag D &&
 753
 754        git checkout B^0 &&
 755        git merge --no-commit -s ours C^0 &&
 756        git mv b a &&
 757        echo 8 >>c &&
 758        git add c &&
 759        git commit -m "E like D but has mod in c" &&
 760        git tag E
 761'
 762
 763test_expect_success 'virtual merge base handles rename/rename(1to2)/add-dest' '
 764        git checkout D^0 &&
 765
 766        git merge -s recursive E^0 &&
 767
 768        test 2 -eq $(git ls-files -s | wc -l) &&
 769        test 0 -eq $(git ls-files -u | wc -l) &&
 770        test 0 -eq $(git ls-files -o | wc -l) &&
 771
 772        test $(git rev-parse HEAD:a) = $(git rev-parse A:a) &&
 773        test $(git rev-parse HEAD:c) = $(git rev-parse E:c)
 774'
 775
 776test_done