$ hg init

  $ cat << EOF > a

  > Small Mathematical Series.

  > One

  > Two

  > Three

  > Four

  > Five

  > Hop we are done.

  > EOF

  $ hg add a

  $ hg commit -m ancestor

  $ cat << EOF > a

  > Small Mathematical Series.

  > 1

  > 2

  > 3

  > 4

  > 5

  > Hop we are done.

  > EOF

  $ hg commit -m branch1

  $ hg co 0

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cat << EOF > a

  > Small Mathematical Series.

  > 1

  > 2

  > 3

  > 6

  > 8

  > Hop we are done.

  > EOF

  $ hg commit -m branch2

  created new head

  $ hg merge 1

  merging a

  warning: conflicts during merge.

  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ hg id

  618808747361+c0c68e4fe667+ tip

  $ cat a

  Small Mathematical Series.

  <<<<<<< local: 618808747361 - test: branch2

  1

  2

  3

  6

  8

  =======

  1

  2

  3

  4

  5

  >>>>>>> other: c0c68e4fe667  - test: branch1

  Hop we are done.

  $ hg status

  M a

  ? a.orig

Verify custom conflict markers

  $ hg up -q --clean .

  $ printf "\n[ui]\nmergemarkertemplate={author} {rev}\n" >> .hg/hgrc

  $ hg merge 1

  merging a

  warning: conflicts during merge.

  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  <<<<<<< local: test 2

  1

  2

  3

  6

  8

  =======

  1

  2

  3

  4

  5

  >>>>>>> other: test 1

  Hop we are done.

Verify line splitting of custom conflict marker which causes multiple lines

  $ hg up -q --clean .

  $ cat >> .hg/hgrc <<EOF

  > [ui]

  > mergemarkertemplate={author} {rev}\nfoo\nbar\nbaz

  > EOF

  $ hg -q merge 1

  warning: conflicts during merge.

  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')

  [1]

  $ cat a

  Small Mathematical Series.

  <<<<<<< local: test 2

  1

  2

  3

  6

  8

  =======

  1

  2

  3

  4

  5

  >>>>>>> other: test 1

  Hop we are done.

Verify line trimming of custom conflict marker using multi-byte characters

  $ hg up -q --clean .

  $ python <<EOF

  > fp = open('logfile', 'w')

  > fp.write('12345678901234567890123456789012345678901234567890' +

  >          '1234567890') # there are 5 more columns for 80 columns

  > 

  > # 2 x 4 = 8 columns, but 3 x 4 = 12 bytes

  > fp.write(u'\u3042\u3044\u3046\u3048'.encode('utf-8'))

  > 

  > fp.close()

  > EOF

  $ hg add logfile

  $ hg --encoding utf-8 commit --logfile logfile

  $ cat >> .hg/hgrc <<EOF

  > [ui]

  > mergemarkertemplate={desc|firstline}

  > EOF

  $ hg -q --encoding utf-8 merge 1

  warning: conflicts during merge.

  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')

  [1]

  $ cat a

  Small Mathematical Series.

  <<<<<<< local: 123456789012345678901234567890123456789012345678901234567890\xe3\x81\x82... (esc)

  1

  2

  3

  6

  8

  =======

  1

  2

  3

  4

  5

  >>>>>>> other: branch1

  Hop we are done.

Verify basic conflict markers

  $ hg up -q --clean 2

  $ printf "\n[ui]\nmergemarkers=basic\n" >> .hg/hgrc

  $ hg merge 1

  merging a

  warning: conflicts during merge.

  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  <<<<<<< local

  1

  2

  3

  6

  8

  =======

  1

  2

  3

  4

  5

  >>>>>>> other

  Hop we are done.

internal:merge3

  $ hg up -q --clean .

  $ hg merge 1 --tool internal:merge3

  merging a

  warning: conflicts during merge.

  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  <<<<<<< local

  1

  2

  3

  6

  8

  ||||||| base

  One

  Two

  Three

  Four

  Five

  =======

  1

  2

  3

  4

  5

  >>>>>>> other

  Hop we are done.