Test that the syntax of "unified tests" is properly processed

==============================================================

Simple commands:

  $ echo foo

  foo

  $ printf 'oh no'

  oh no (no-eol)

  $ printf 'bar\nbaz\n' | cat

  bar

  baz

Multi-line command:

  $ foo() {

  >     echo bar

  > }

  $ foo

  bar

Return codes before inline python:

  $ sh -c 'exit 1'

  [1]

Doctest commands:

  >>> print('foo')

  foo

  $ echo interleaved

  interleaved

  >>> for c in 'xyz':

  ...     print(c)

  x

  y

  z

  >>> print()

  >>> foo = 'global name'

  >>> def func():

  ...     print(foo, 'should be visible in func()')

  >>> func()

  global name should be visible in func()

  >>> print('''multiline

  ... string''')

  multiline

  string

Regular expressions:

  $ echo foobarbaz

  foobar.* (re)

  $ echo barbazquux

  .*quux.* (re)

Globs:

  $ printf '* \\foobarbaz {10}\n'

  \* \\fo?bar* {10} (glob)

Literal match ending in " (re)":

  $ echo 'foo (re)'

  foo (re)

Windows: \r\n is handled like \n and can be escaped:

#if windows

  $ printf 'crlf\r\ncr\r\tcrlf\r\ncrlf\r\n'

  crlf

  cr\r (no-eol) (esc)

  \tcrlf (esc)

  crlf\r (esc)

#endif

Escapes:

  $ "$PYTHON" -c 'from mercurial.utils.procutil import stdout; stdout.write(b"\xff")'

  \xff (no-eol) (esc)

Escapes with conditions:

  $ "$PYTHON" -c 'from mercurial.utils.procutil import stdout; stdout.write(b"\xff")'

  \xff (no-eol) (esc) (true !)

Combining esc with other markups - and handling lines ending with \r instead of \n:

  $ printf 'foo/bar\r'

  fo?/bar\r (no-eol) (glob) (esc)

#if windows

  $ printf 'foo\\bar\r'

  foo/bar\r (no-eol) (esc)

#endif

  $ printf 'foo/bar\rfoo/bar\r'

  foo.bar\r [(]no-eol[)] (re) (esc)

  foo.bar\r \(no-eol\) (re)

testing hghave

  $ hghave true

  $ hghave false

  skipped: missing feature: nail clipper

  [1]

  $ hghave no-true

  skipped: system supports yak shaving

  [1]

  $ hghave no-false

Conditional sections based on hghave:

#if true

  $ echo tested

  tested

#else

  $ echo skipped

#endif

#if false

  $ echo skipped

#else

  $ echo tested

  tested

#endif

#if no-false

  $ echo tested

  tested

#else

  $ echo skipped

#endif

#if no-true

  $ echo skipped

#else

  $ echo tested

  tested

#endif

Exit code:

  $ (exit 1)

  [1]