Andrew's git / gitweb.git / t/t7600-merge.sh
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t / t7600-merge.shon commit reset.c: replace switch by if-else (b489097)
   1#!/bin/sh
   2#
   3# Copyright (c) 2007 Lars Hjemli
   4#
   5
   6test_description='git merge
   7
   8Testing basic merge operations/option parsing.
   9
  10! [c0] commit 0
  11 ! [c1] commit 1
  12  ! [c2] commit 2
  13   ! [c3] commit 3
  14    ! [c4] c4
  15     ! [c5] c5
  16      ! [c6] c6
  17       * [master] Merge commit 'c1'
  18--------
  19       - [master] Merge commit 'c1'
  20 +     * [c1] commit 1
  21      +  [c6] c6
  22     +   [c5] c5
  23    ++   [c4] c4
  24   ++++  [c3] commit 3
  25  +      [c2] commit 2
  26+++++++* [c0] commit 0
  27'
  28
  29. ./test-lib.sh
  30. "$TEST_DIRECTORY"/lib-gpg.sh
  31
  32printf '%s\n' 1 2 3 4 5 6 7 8 9 >file
  33printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >file.1
  34printf '%s\n' 1 2 3 4 '5 X' 6 7 8 9 >file.5
  35printf '%s\n' 1 2 3 4 5 6 7 8 '9 X' >file.9
  36printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >result.1
  37printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 9 >result.1-5
  38printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 '9 X' >result.1-5-9
  39>empty
  40
  41create_merge_msgs () {
  42        echo "Merge tag 'c2'" >msg.1-5 &&
  43        echo "Merge tags 'c2' and 'c3'" >msg.1-5-9 &&
  44        {
  45                echo "Squashed commit of the following:" &&
  46                echo &&
  47                git log --no-merges ^HEAD c1
  48        } >squash.1 &&
  49        {
  50                echo "Squashed commit of the following:" &&
  51                echo &&
  52                git log --no-merges ^HEAD c2
  53        } >squash.1-5 &&
  54        {
  55                echo "Squashed commit of the following:" &&
  56                echo &&
  57                git log --no-merges ^HEAD c2 c3
  58        } >squash.1-5-9 &&
  59        echo >msg.nolog &&
  60        {
  61                echo "* tag 'c3':" &&
  62                echo "  commit 3" &&
  63                echo
  64        } >msg.log
  65}
  66
  67verify_merge () {
  68        test_cmp "$2" "$1" &&
  69        git update-index --refresh &&
  70        git diff --exit-code &&
  71        if test -n "$3"
  72        then
  73                git show -s --pretty=format:%s HEAD >msg.act &&
  74                test_cmp "$3" msg.act
  75        fi
  76}
  77
  78verify_head () {
  79        echo "$1" >head.expected &&
  80        git rev-parse HEAD >head.actual &&
  81        test_cmp head.expected head.actual
  82}
  83
  84verify_parents () {
  85        printf '%s\n' "$@" >parents.expected &&
  86        >parents.actual &&
  87        i=1 &&
  88        while test $i -le $#
  89        do
  90                git rev-parse HEAD^$i >>parents.actual &&
  91                i=$(expr $i + 1) ||
  92                return 1
  93        done &&
  94        test_must_fail git rev-parse --verify "HEAD^$i" &&
  95        test_cmp parents.expected parents.actual
  96}
  97
  98verify_mergeheads () {
  99        printf '%s\n' "$@" >mergehead.expected &&
 100        while read sha1 rest
 101        do
 102                git rev-parse $sha1
 103        done <.git/MERGE_HEAD >mergehead.actual &&
 104        test_cmp mergehead.expected mergehead.actual
 105}
 106
 107verify_no_mergehead () {
 108        ! test -e .git/MERGE_HEAD
 109}
 110
 111test_expect_success 'setup' '
 112        git add file &&
 113        test_tick &&
 114        git commit -m "commit 0" &&
 115        git tag c0 &&
 116        c0=$(git rev-parse HEAD) &&
 117        cp file.1 file &&
 118        git add file &&
 119        test_tick &&
 120        git commit -m "commit 1" &&
 121        git tag c1 &&
 122        c1=$(git rev-parse HEAD) &&
 123        git reset --hard "$c0" &&
 124        cp file.5 file &&
 125        git add file &&
 126        test_tick &&
 127        git commit -m "commit 2" &&
 128        git tag c2 &&
 129        c2=$(git rev-parse HEAD) &&
 130        git reset --hard "$c0" &&
 131        cp file.9 file &&
 132        git add file &&
 133        test_tick &&
 134        git commit -m "commit 3" &&
 135        git tag c3 &&
 136        c3=$(git rev-parse HEAD)
 137        git reset --hard "$c0" &&
 138        create_merge_msgs
 139'
 140
 141test_debug 'git log --graph --decorate --oneline --all'
 142
 143test_expect_success 'test option parsing' '
 144        test_must_fail git merge -$ c1 &&
 145        test_must_fail git merge --no-such c1 &&
 146        test_must_fail git merge -s foobar c1 &&
 147        test_must_fail git merge -s=foobar c1 &&
 148        test_must_fail git merge -m &&
 149        test_must_fail git merge
 150'
 151
 152test_expect_success 'merge -h with invalid index' '
 153        mkdir broken &&
 154        (
 155                cd broken &&
 156                git init &&
 157                >.git/index &&
 158                test_expect_code 129 git merge -h 2>usage
 159        ) &&
 160        test_i18ngrep "[Uu]sage: git merge" broken/usage
 161'
 162
 163test_expect_success 'reject non-strategy with a git-merge-foo name' '
 164        test_must_fail git merge -s index c1
 165'
 166
 167test_expect_success 'merge c0 with c1' '
 168        echo "OBJID HEAD@{0}: merge c1: Fast-forward" >reflog.expected &&
 169
 170        git reset --hard c0 &&
 171        git merge c1 &&
 172        verify_merge file result.1 &&
 173        verify_head "$c1" &&
 174
 175        git reflog -1 >reflog.actual &&
 176        sed "s/$_x05[0-9a-f]*/OBJID/g" reflog.actual >reflog.fuzzy &&
 177        test_cmp reflog.expected reflog.fuzzy
 178'
 179
 180test_debug 'git log --graph --decorate --oneline --all'
 181
 182test_expect_success 'merge c0 with c1 with --ff-only' '
 183        git reset --hard c0 &&
 184        git merge --ff-only c1 &&
 185        git merge --ff-only HEAD c0 c1 &&
 186        verify_merge file result.1 &&
 187        verify_head "$c1"
 188'
 189
 190test_debug 'git log --graph --decorate --oneline --all'
 191
 192test_expect_success 'merge from unborn branch' '
 193        git checkout -f master &&
 194        test_might_fail git branch -D kid &&
 195
 196        echo "OBJID HEAD@{0}: initial pull" >reflog.expected &&
 197
 198        git checkout --orphan kid &&
 199        test_when_finished "git checkout -f master" &&
 200        git rm -fr . &&
 201        test_tick &&
 202        git merge --ff-only c1 &&
 203        verify_merge file result.1 &&
 204        verify_head "$c1" &&
 205
 206        git reflog -1 >reflog.actual &&
 207        sed "s/$_x05[0-9a-f][0-9a-f]/OBJID/g" reflog.actual >reflog.fuzzy &&
 208        test_cmp reflog.expected reflog.fuzzy
 209'
 210
 211test_debug 'git log --graph --decorate --oneline --all'
 212
 213test_expect_success 'merge c1 with c2' '
 214        git reset --hard c1 &&
 215        test_tick &&
 216        git merge c2 &&
 217        verify_merge file result.1-5 msg.1-5 &&
 218        verify_parents $c1 $c2
 219'
 220
 221test_debug 'git log --graph --decorate --oneline --all'
 222
 223test_expect_success 'merge c1 with c2 and c3' '
 224        git reset --hard c1 &&
 225        test_tick &&
 226        git merge c2 c3 &&
 227        verify_merge file result.1-5-9 msg.1-5-9 &&
 228        verify_parents $c1 $c2 $c3
 229'
 230
 231test_debug 'git log --graph --decorate --oneline --all'
 232
 233test_expect_success 'merges with --ff-only' '
 234        git reset --hard c1 &&
 235        test_tick &&
 236        test_must_fail git merge --ff-only c2 &&
 237        test_must_fail git merge --ff-only c3 &&
 238        test_must_fail git merge --ff-only c2 c3 &&
 239        git reset --hard c0 &&
 240        git merge c3 &&
 241        verify_head $c3
 242'
 243
 244test_expect_success 'merges with merge.ff=only' '
 245        git reset --hard c1 &&
 246        test_tick &&
 247        test_when_finished "git config --unset merge.ff" &&
 248        git config merge.ff only &&
 249        test_must_fail git merge c2 &&
 250        test_must_fail git merge c3 &&
 251        test_must_fail git merge c2 c3 &&
 252        git reset --hard c0 &&
 253        git merge c3 &&
 254        verify_head $c3
 255'
 256
 257test_expect_success 'merge c0 with c1 (no-commit)' '
 258        git reset --hard c0 &&
 259        git merge --no-commit c1 &&
 260        verify_merge file result.1 &&
 261        verify_head $c1
 262'
 263
 264test_debug 'git log --graph --decorate --oneline --all'
 265
 266test_expect_success 'merge c1 with c2 (no-commit)' '
 267        git reset --hard c1 &&
 268        git merge --no-commit c2 &&
 269        verify_merge file result.1-5 &&
 270        verify_head $c1 &&
 271        verify_mergeheads $c2
 272'
 273
 274test_debug 'git log --graph --decorate --oneline --all'
 275
 276test_expect_success 'merge c1 with c2 and c3 (no-commit)' '
 277        git reset --hard c1 &&
 278        git merge --no-commit c2 c3 &&
 279        verify_merge file result.1-5-9 &&
 280        verify_head $c1 &&
 281        verify_mergeheads $c2 $c3
 282'
 283
 284test_debug 'git log --graph --decorate --oneline --all'
 285
 286test_expect_success 'merge c0 with c1 (squash)' '
 287        git reset --hard c0 &&
 288        git merge --squash c1 &&
 289        verify_merge file result.1 &&
 290        verify_head $c0 &&
 291        verify_no_mergehead &&
 292        test_cmp squash.1 .git/SQUASH_MSG
 293'
 294
 295test_debug 'git log --graph --decorate --oneline --all'
 296
 297test_expect_success 'merge c0 with c1 (squash, ff-only)' '
 298        git reset --hard c0 &&
 299        git merge --squash --ff-only c1 &&
 300        verify_merge file result.1 &&
 301        verify_head $c0 &&
 302        verify_no_mergehead &&
 303        test_cmp squash.1 .git/SQUASH_MSG
 304'
 305
 306test_debug 'git log --graph --decorate --oneline --all'
 307
 308test_expect_success 'merge c1 with c2 (squash)' '
 309        git reset --hard c1 &&
 310        git merge --squash c2 &&
 311        verify_merge file result.1-5 &&
 312        verify_head $c1 &&
 313        verify_no_mergehead &&
 314        test_cmp squash.1-5 .git/SQUASH_MSG
 315'
 316
 317test_debug 'git log --graph --decorate --oneline --all'
 318
 319test_expect_success 'unsuccesful merge of c1 with c2 (squash, ff-only)' '
 320        git reset --hard c1 &&
 321        test_must_fail git merge --squash --ff-only c2
 322'
 323
 324test_debug 'git log --graph --decorate --oneline --all'
 325
 326test_expect_success 'merge c1 with c2 and c3 (squash)' '
 327        git reset --hard c1 &&
 328        git merge --squash c2 c3 &&
 329        verify_merge file result.1-5-9 &&
 330        verify_head $c1 &&
 331        verify_no_mergehead &&
 332        test_cmp squash.1-5-9 .git/SQUASH_MSG
 333'
 334
 335test_debug 'git log --graph --decorate --oneline --all'
 336
 337test_expect_success 'merge c1 with c2 (no-commit in config)' '
 338        git reset --hard c1 &&
 339        git config branch.master.mergeoptions "--no-commit" &&
 340        git merge c2 &&
 341        verify_merge file result.1-5 &&
 342        verify_head $c1 &&
 343        verify_mergeheads $c2
 344'
 345
 346test_debug 'git log --graph --decorate --oneline --all'
 347
 348test_expect_success 'merge c1 with c2 (log in config)' '
 349        git config branch.master.mergeoptions "" &&
 350        git reset --hard c1 &&
 351        git merge --log c2 &&
 352        git show -s --pretty=tformat:%s%n%b >expect &&
 353
 354        git config branch.master.mergeoptions --log &&
 355        git reset --hard c1 &&
 356        git merge c2 &&
 357        git show -s --pretty=tformat:%s%n%b >actual &&
 358
 359        test_cmp expect actual
 360'
 361
 362test_expect_success 'merge c1 with c2 (log in config gets overridden)' '
 363        test_when_finished "git config --remove-section branch.master" &&
 364        test_when_finished "git config --remove-section merge" &&
 365        test_might_fail git config --remove-section branch.master &&
 366        test_might_fail git config --remove-section merge &&
 367
 368        git reset --hard c1 &&
 369        git merge c2 &&
 370        git show -s --pretty=tformat:%s%n%b >expect &&
 371
 372        git config branch.master.mergeoptions "--no-log" &&
 373        git config merge.log true &&
 374        git reset --hard c1 &&
 375        git merge c2 &&
 376        git show -s --pretty=tformat:%s%n%b >actual &&
 377
 378        test_cmp expect actual
 379'
 380
 381test_expect_success 'merge c1 with c2 (squash in config)' '
 382        git reset --hard c1 &&
 383        git config branch.master.mergeoptions "--squash" &&
 384        git merge c2 &&
 385        verify_merge file result.1-5 &&
 386        verify_head $c1 &&
 387        verify_no_mergehead &&
 388        test_cmp squash.1-5 .git/SQUASH_MSG
 389'
 390
 391test_debug 'git log --graph --decorate --oneline --all'
 392
 393test_expect_success 'override config option -n with --summary' '
 394        git reset --hard c1 &&
 395        git config branch.master.mergeoptions "-n" &&
 396        test_tick &&
 397        git merge --summary c2 >diffstat.txt &&
 398        verify_merge file result.1-5 msg.1-5 &&
 399        verify_parents $c1 $c2 &&
 400        if ! grep "^ file |  *2 +-$" diffstat.txt
 401        then
 402                echo "[OOPS] diffstat was not generated with --summary"
 403                false
 404        fi
 405'
 406
 407test_expect_success 'override config option -n with --stat' '
 408        git reset --hard c1 &&
 409        git config branch.master.mergeoptions "-n" &&
 410        test_tick &&
 411        git merge --stat c2 >diffstat.txt &&
 412        verify_merge file result.1-5 msg.1-5 &&
 413        verify_parents $c1 $c2 &&
 414        if ! grep "^ file |  *2 +-$" diffstat.txt
 415        then
 416                echo "[OOPS] diffstat was not generated with --stat"
 417                false
 418        fi
 419'
 420
 421test_debug 'git log --graph --decorate --oneline --all'
 422
 423test_expect_success 'override config option --stat' '
 424        git reset --hard c1 &&
 425        git config branch.master.mergeoptions "--stat" &&
 426        test_tick &&
 427        git merge -n c2 >diffstat.txt &&
 428        verify_merge file result.1-5 msg.1-5 &&
 429        verify_parents $c1 $c2 &&
 430        if grep "^ file |  *2 +-$" diffstat.txt
 431        then
 432                echo "[OOPS] diffstat was generated"
 433                false
 434        fi
 435'
 436
 437test_debug 'git log --graph --decorate --oneline --all'
 438
 439test_expect_success 'merge c1 with c2 (override --no-commit)' '
 440        git reset --hard c1 &&
 441        git config branch.master.mergeoptions "--no-commit" &&
 442        test_tick &&
 443        git merge --commit c2 &&
 444        verify_merge file result.1-5 msg.1-5 &&
 445        verify_parents $c1 $c2
 446'
 447
 448test_debug 'git log --graph --decorate --oneline --all'
 449
 450test_expect_success 'merge c1 with c2 (override --squash)' '
 451        git reset --hard c1 &&
 452        git config branch.master.mergeoptions "--squash" &&
 453        test_tick &&
 454        git merge --no-squash c2 &&
 455        verify_merge file result.1-5 msg.1-5 &&
 456        verify_parents $c1 $c2
 457'
 458
 459test_debug 'git log --graph --decorate --oneline --all'
 460
 461test_expect_success 'merge c0 with c1 (no-ff)' '
 462        git reset --hard c0 &&
 463        git config branch.master.mergeoptions "" &&
 464        test_tick &&
 465        git merge --no-ff c1 &&
 466        verify_merge file result.1 &&
 467        verify_parents $c0 $c1
 468'
 469
 470test_debug 'git log --graph --decorate --oneline --all'
 471
 472test_expect_success 'merge c0 with c1 (merge.ff=false)' '
 473        git reset --hard c0 &&
 474        git config merge.ff false &&
 475        test_tick &&
 476        git merge c1 &&
 477        git config --remove-section merge &&
 478        verify_merge file result.1 &&
 479        verify_parents $c0 $c1
 480'
 481test_debug 'git log --graph --decorate --oneline --all'
 482
 483test_expect_success 'combine branch.master.mergeoptions with merge.ff' '
 484        git reset --hard c0 &&
 485        git config branch.master.mergeoptions --ff &&
 486        git config merge.ff false &&
 487        test_tick &&
 488        git merge c1 &&
 489        git config --remove-section "branch.master" &&
 490        git config --remove-section "merge" &&
 491        verify_merge file result.1 &&
 492        verify_parents "$c0"
 493'
 494
 495test_expect_success 'tolerate unknown values for merge.ff' '
 496        git reset --hard c0 &&
 497        git config merge.ff something-new &&
 498        test_tick &&
 499        git merge c1 2>message &&
 500        git config --remove-section "merge" &&
 501        verify_head "$c1" &&
 502        test_cmp empty message
 503'
 504
 505test_expect_success 'combining --squash and --no-ff is refused' '
 506        git reset --hard c0 &&
 507        test_must_fail git merge --squash --no-ff c1 &&
 508        test_must_fail git merge --no-ff --squash c1
 509'
 510
 511test_expect_success 'combining --ff-only and --no-ff is refused' '
 512        test_must_fail git merge --ff-only --no-ff c1 &&
 513        test_must_fail git merge --no-ff --ff-only c1
 514'
 515
 516test_expect_success 'merge c0 with c1 (ff overrides no-ff)' '
 517        git reset --hard c0 &&
 518        git config branch.master.mergeoptions "--no-ff" &&
 519        git merge --ff c1 &&
 520        verify_merge file result.1 &&
 521        verify_head $c1
 522'
 523
 524test_expect_success 'merge log message' '
 525        git reset --hard c0 &&
 526        git merge --no-log c2 &&
 527        git show -s --pretty=format:%b HEAD >msg.act &&
 528        test_cmp msg.nolog msg.act &&
 529
 530        git merge --log c3 &&
 531        git show -s --pretty=format:%b HEAD >msg.act &&
 532        test_cmp msg.log msg.act &&
 533
 534        git reset --hard HEAD^ &&
 535        git config merge.log yes &&
 536        git merge c3 &&
 537        git show -s --pretty=format:%b HEAD >msg.act &&
 538        test_cmp msg.log msg.act
 539'
 540
 541test_debug 'git log --graph --decorate --oneline --all'
 542
 543test_expect_success 'merge c1 with c0, c2, c0, and c1' '
 544       git reset --hard c1 &&
 545       git config branch.master.mergeoptions "" &&
 546       test_tick &&
 547       git merge c0 c2 c0 c1 &&
 548       verify_merge file result.1-5 &&
 549       verify_parents $c1 $c2
 550'
 551
 552test_debug 'git log --graph --decorate --oneline --all'
 553
 554test_expect_success 'merge c1 with c0, c2, c0, and c1' '
 555       git reset --hard c1 &&
 556       git config branch.master.mergeoptions "" &&
 557       test_tick &&
 558       git merge c0 c2 c0 c1 &&
 559       verify_merge file result.1-5 &&
 560       verify_parents $c1 $c2
 561'
 562
 563test_debug 'git log --graph --decorate --oneline --all'
 564
 565test_expect_success 'merge c1 with c1 and c2' '
 566       git reset --hard c1 &&
 567       git config branch.master.mergeoptions "" &&
 568       test_tick &&
 569       git merge c1 c2 &&
 570       verify_merge file result.1-5 &&
 571       verify_parents $c1 $c2
 572'
 573
 574test_debug 'git log --graph --decorate --oneline --all'
 575
 576test_expect_success 'merge fast-forward in a dirty tree' '
 577       git reset --hard c0 &&
 578       mv file file1 &&
 579       cat file1 >file &&
 580       rm -f file1 &&
 581       git merge c2
 582'
 583
 584test_debug 'git log --graph --decorate --oneline --all'
 585
 586test_expect_success 'in-index merge' '
 587        git reset --hard c0 &&
 588        git merge --no-ff -s resolve c1 >out &&
 589        test_i18ngrep "Wonderful." out &&
 590        verify_parents $c0 $c1
 591'
 592
 593test_debug 'git log --graph --decorate --oneline --all'
 594
 595test_expect_success 'refresh the index before merging' '
 596        git reset --hard c1 &&
 597        cp file file.n && mv -f file.n file &&
 598        git merge c3
 599'
 600
 601cat >expected.branch <<\EOF
 602Merge branch 'c5-branch' (early part)
 603EOF
 604cat >expected.tag <<\EOF
 605Merge commit 'c5~1'
 606EOF
 607
 608test_expect_success 'merge early part of c2' '
 609        git reset --hard c3 &&
 610        echo c4 >c4.c &&
 611        git add c4.c &&
 612        git commit -m c4 &&
 613        git tag c4 &&
 614        echo c5 >c5.c &&
 615        git add c5.c &&
 616        git commit -m c5 &&
 617        git tag c5 &&
 618        git reset --hard c3 &&
 619        echo c6 >c6.c &&
 620        git add c6.c &&
 621        git commit -m c6 &&
 622        git tag c6 &&
 623        git branch -f c5-branch c5 &&
 624        git merge c5-branch~1 &&
 625        git show -s --pretty=format:%s HEAD >actual.branch &&
 626        git reset --keep HEAD^ &&
 627        git merge c5~1 &&
 628        git show -s --pretty=format:%s HEAD >actual.tag &&
 629        test_cmp expected.branch actual.branch &&
 630        test_cmp expected.tag actual.tag
 631'
 632
 633test_debug 'git log --graph --decorate --oneline --all'
 634
 635test_expect_success 'merge --no-ff --no-commit && commit' '
 636        git reset --hard c0 &&
 637        git merge --no-ff --no-commit c1 &&
 638        EDITOR=: git commit &&
 639        verify_parents $c0 $c1
 640'
 641
 642test_debug 'git log --graph --decorate --oneline --all'
 643
 644test_expect_success 'amending no-ff merge commit' '
 645        EDITOR=: git commit --amend &&
 646        verify_parents $c0 $c1
 647'
 648
 649test_debug 'git log --graph --decorate --oneline --all'
 650
 651cat >editor <<\EOF
 652#!/bin/sh
 653# Add a new message string that was not in the template
 654(
 655        echo "Merge work done on the side branch c1"
 656        echo
 657        cat <"$1"
 658) >"$1.tmp" && mv "$1.tmp" "$1"
 659# strip comments and blank lines from end of message
 660sed -e '/^#/d' < "$1" | sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' > expected
 661EOF
 662chmod 755 editor
 663
 664test_expect_success 'merge --no-ff --edit' '
 665        git reset --hard c0 &&
 666        EDITOR=./editor git merge --no-ff --edit c1 &&
 667        verify_parents $c0 $c1 &&
 668        git cat-file commit HEAD >raw &&
 669        grep "work done on the side branch" raw &&
 670        sed "1,/^$/d" >actual raw &&
 671        test_cmp actual expected
 672'
 673
 674test_expect_success GPG 'merge --ff-only tag' '
 675        git reset --hard c0 &&
 676        git commit --allow-empty -m "A newer commit" &&
 677        git tag -s -m "A newer commit" signed &&
 678        git reset --hard c0 &&
 679
 680        git merge --ff-only signed &&
 681        git rev-parse signed^0 >expect &&
 682        git rev-parse HEAD >actual &&
 683        test_cmp actual expect
 684'
 685
 686test_expect_success GPG 'merge --no-edit tag should skip editor' '
 687        git reset --hard c0 &&
 688        git commit --allow-empty -m "A newer commit" &&
 689        git tag -f -s -m "A newer commit" signed &&
 690        git reset --hard c0 &&
 691
 692        EDITOR=false git merge --no-edit signed &&
 693        git rev-parse signed^0 >expect &&
 694        git rev-parse HEAD^2 >actual &&
 695        test_cmp actual expect
 696'
 697
 698test_done