view tests/test-run-tests.t @ 36534:5faeabb07cf5

debugcommands: support for triggering push protocol

The mechanism for pushing to a remote is a bit more complicated
than other commands. On SSH, we wait for a positive reply from
the server before we start sending the bundle payload.

This commit adds a mechanism to the "command" action in
`hg debugwireproto` to trigger the "push protocol" and to
specify a file whose contents should be submitted as the command
payload.

With this new feature, we implement a handful of tests for the
"unbundle" command. We try to cover various server failures and
hook/output scenarios so protocol behavior is as comprehensively
tested as possible. Even with so much test output, we only cover
bundle1 with Python hooks. There's still a lot of test coverage
that needs to be implemented. But this is certainly a good start.

Because there are so many new tests, we split these tests into their
own test file.

In order to make output deterministic, we need to disable the
doublepipe primitive. We add an option to `hg debugwireproto`
to do that. Because something in the bowels of the peer does a
read of stderr, we still capture read I/O from stderr. So there
is test coverage of what the server emits.

The tests around I/O capture some wonkiness. For example,
interleaved ui.write() and ui.write_err() calls are emitted in
order. However, (presumably due to buffering), print() to
sys.stdout and sys.stderr aren't in order.

We currently only test bundle1 because bundle2 is substantially
harder to test because it is more complicated (the server responds
with a stream containing a bundle2 instead of a frame).

Differential Revision: https://phab.mercurial-scm.org/D2471

This file tests the behavior of run-tests.py itself.

Avoid interference from actual test env:

  $ . "$TESTDIR/helper-runtests.sh"

Smoke test with install
============

  $ run-tests.py $HGTEST_RUN_TESTS_PURE -l
  
  # Ran 0 tests, 0 skipped, 0 failed.

Define a helper to avoid the install step
=============
  $ rt()
  > {
  >     run-tests.py --with-hg=`which hg` "$@"
  > }

error paths

#if symlink
  $ ln -s `which true` hg
  $ run-tests.py --with-hg=./hg
  warning: --with-hg should specify an hg script
  
  # Ran 0 tests, 0 skipped, 0 failed.
  $ rm hg
#endif

#if execbit
  $ touch hg
  $ run-tests.py --with-hg=./hg
  usage: run-tests.py [options] [tests]
  run-tests.py: error: --with-hg must specify an executable hg script
  [2]
  $ rm hg
#endif

Features for testing optional lines
===================================

  $ cat > hghaveaddon.py <<EOF
  > import hghave
  > @hghave.check("custom", "custom hghave feature")
  > def has_custom():
  >     return True
  > @hghave.check("missing", "missing hghave feature")
  > def has_missing():
  >     return False
  > EOF

an empty test
=======================

  $ touch test-empty.t
  $ rt
  .
  # Ran 1 tests, 0 skipped, 0 failed.
  $ rm test-empty.t

a succesful test
=======================

  $ cat > test-success.t << EOF
  >   $ echo babar
  >   babar
  >   $ echo xyzzy
  >   dont_print (?)
  >   nothing[42]line (re) (?)
  >   never*happens (glob) (?)
  >   more_nothing (?)
  >   xyzzy
  >   nor this (?)
  >   $ printf 'abc\ndef\nxyz\n'
  >   123 (?)
  >   abc
  >   def (?)
  >   456 (?)
  >   xyz
  >   $ printf 'zyx\nwvu\ntsr\n'
  >   abc (?)
  >   zyx (custom !)
  >   wvu
  >   no_print (no-custom !)
  >   tsr (no-missing !)
  >   missing (missing !)
  > EOF

  $ rt
  .
  # Ran 1 tests, 0 skipped, 0 failed.

failing test
==================

test churn with globs
  $ cat > test-failure.t <<EOF
  >   $ echo "bar-baz"; echo "bar-bad"; echo foo
  >   bar*bad (glob)
  >   bar*baz (glob)
  >   | fo (re)
  > EOF
  $ rt test-failure.t
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,4 +1,4 @@
     $ echo "bar-baz"; echo "bar-bad"; echo foo
  +  bar*baz (glob)
     bar*bad (glob)
  -  bar*baz (glob)
  -  | fo (re)
  +  foo
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

test diff colorisation

#if no-windows pygments
  $ rt test-failure.t --color always
  
  \x1b[38;5;124m--- $TESTTMP/test-failure.t\x1b[39m (esc)
  \x1b[38;5;34m+++ $TESTTMP/test-failure.t.err\x1b[39m (esc)
  \x1b[38;5;90;01m@@ -1,4 +1,4 @@\x1b[39;00m (esc)
     $ echo "bar-baz"; echo "bar-bad"; echo foo
  \x1b[38;5;34m+  bar*baz (glob)\x1b[39m (esc)
     bar*bad (glob)
  \x1b[38;5;124m-  bar*baz (glob)\x1b[39m (esc)
  \x1b[38;5;124m-  | fo (re)\x1b[39m (esc)
  \x1b[38;5;34m+  foo\x1b[39m (esc)
  
  \x1b[38;5;88mERROR: \x1b[39m\x1b[38;5;9mtest-failure.t\x1b[39m\x1b[38;5;88m output changed\x1b[39m (esc)
  !
  \x1b[38;5;88mFailed \x1b[39m\x1b[38;5;9mtest-failure.t\x1b[39m\x1b[38;5;88m: output changed\x1b[39m (esc)
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ rt test-failure.t 2> tmp.log
  [1]
  $ cat tmp.log
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,4 +1,4 @@
     $ echo "bar-baz"; echo "bar-bad"; echo foo
  +  bar*baz (glob)
     bar*bad (glob)
  -  bar*baz (glob)
  -  | fo (re)
  +  foo
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
#endif

  $ cat > test-failure.t << EOF
  >   $ true
  >   should go away (true !)
  >   $ true
  >   should stay (false !)
  > 
  > Should remove first line, not second or third
  >   $ echo 'testing'
  >   baz*foo (glob) (true !)
  >   foobar*foo (glob) (false !)
  >   te*ting (glob) (true !)
  > 
  > Should keep first two lines, remove third and last
  >   $ echo 'testing'
  >   test.ng (re) (true !)
  >   foo.ar (re) (false !)
  >   b.r (re) (true !)
  >   missing (?)
  >   awol (true !)
  > 
  > The "missing" line should stay, even though awol is dropped
  >   $ echo 'testing'
  >   test.ng (re) (true !)
  >   foo.ar (?)
  >   awol
  >   missing (?)
  > EOF
  $ rt test-failure.t
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,11 +1,9 @@
     $ true
  -  should go away (true !)
     $ true
     should stay (false !)
   
   Should remove first line, not second or third
     $ echo 'testing'
  -  baz*foo (glob) (true !)
     foobar*foo (glob) (false !)
     te*ting (glob) (true !)
   
     foo.ar (re) (false !)
     missing (?)
  @@ -13,13 +11,10 @@
     $ echo 'testing'
     test.ng (re) (true !)
     foo.ar (re) (false !)
  -  b.r (re) (true !)
     missing (?)
  -  awol (true !)
   
   The "missing" line should stay, even though awol is dropped
     $ echo 'testing'
     test.ng (re) (true !)
     foo.ar (?)
  -  awol
     missing (?)
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

basic failing test
  $ cat > test-failure.t << EOF
  >   $ echo babar
  >   rataxes
  > This is a noop statement so that
  > this test is still more bytes than success.
  > pad pad pad pad............................................................
  > pad pad pad pad............................................................
  > pad pad pad pad............................................................
  > pad pad pad pad............................................................
  > pad pad pad pad............................................................
  > pad pad pad pad............................................................
  > EOF

  >>> fh = open('test-failure-unicode.t', 'wb')
  >>> fh.write(u'  $ echo babar\u03b1\n'.encode('utf-8')) and None
  >>> fh.write(u'  l\u03b5\u03b5t\n'.encode('utf-8')) and None

  $ rt
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !.
  --- $TESTTMP/test-failure-unicode.t
  +++ $TESTTMP/test-failure-unicode.t.err
  @@ -1,2 +1,2 @@
     $ echo babar\xce\xb1 (esc)
  -  l\xce\xb5\xce\xb5t (esc)
  +  babar\xce\xb1 (esc)
  
  ERROR: test-failure-unicode.t output changed
  !
  Failed test-failure.t: output changed
  Failed test-failure-unicode.t: output changed
  # Ran 3 tests, 0 skipped, 2 failed.
  python hash seed: * (glob)
  [1]

test --outputdir
  $ mkdir output
  $ rt --outputdir output
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/output/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !.
  --- $TESTTMP/test-failure-unicode.t
  +++ $TESTTMP/output/test-failure-unicode.t.err
  @@ -1,2 +1,2 @@
     $ echo babar\xce\xb1 (esc)
  -  l\xce\xb5\xce\xb5t (esc)
  +  babar\xce\xb1 (esc)
  
  ERROR: test-failure-unicode.t output changed
  !
  Failed test-failure.t: output changed
  Failed test-failure-unicode.t: output changed
  # Ran 3 tests, 0 skipped, 2 failed.
  python hash seed: * (glob)
  [1]
  $ ls -a output
  .
  ..
  .testtimes
  test-failure-unicode.t.err
  test-failure.t.err

test --xunit support
  $ rt --xunit=xunit.xml
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !.
  --- $TESTTMP/test-failure-unicode.t
  +++ $TESTTMP/test-failure-unicode.t.err
  @@ -1,2 +1,2 @@
     $ echo babar\xce\xb1 (esc)
  -  l\xce\xb5\xce\xb5t (esc)
  +  babar\xce\xb1 (esc)
  
  ERROR: test-failure-unicode.t output changed
  !
  Failed test-failure.t: output changed
  Failed test-failure-unicode.t: output changed
  # Ran 3 tests, 0 skipped, 2 failed.
  python hash seed: * (glob)
  [1]
  $ cat xunit.xml
  <?xml version="1.0" encoding="utf-8"?>
  <testsuite errors="0" failures="2" name="run-tests" skipped="0" tests="3">
    <testcase name="test-success.t" time="*"/> (glob)
    <testcase name="test-failure-unicode.t" time="*"> (glob)
      <failure message="output changed" type="output-mismatch">
  <![CDATA[--- $TESTTMP/test-failure-unicode.t
  +++ $TESTTMP/test-failure-unicode.t.err
  @@ -1,2 +1,2 @@
     $ echo babar\xce\xb1 (esc)
  -  l\xce\xb5\xce\xb5t (esc)
  +  babar\xce\xb1 (esc)
  ]]>    </failure>
    </testcase>
    <testcase name="test-failure.t" time="*"> (glob)
      <failure message="output changed" type="output-mismatch">
  <![CDATA[--- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  ]]>    </failure>
    </testcase>
  </testsuite>

  $ cat .testtimes
  test-empty.t * (glob)
  test-failure-unicode.t * (glob)
  test-failure.t * (glob)
  test-success.t * (glob)

  $ rt --list-tests
  test-failure-unicode.t
  test-failure.t
  test-success.t

  $ rt --list-tests --json
  test-failure-unicode.t
  test-failure.t
  test-success.t
  $ cat report.json
  testreport ={
      "test-failure-unicode.t": {
          "result": "success"
      },
      "test-failure.t": {
          "result": "success"
      },
      "test-success.t": {
          "result": "success"
      }
  } (no-eol)

  $ rt --list-tests --xunit=xunit.xml
  test-failure-unicode.t
  test-failure.t
  test-success.t
  $ cat xunit.xml
  <?xml version="1.0" encoding="utf-8"?>
  <testsuite errors="0" failures="0" name="run-tests" skipped="0" tests="0">
    <testcase name="test-failure-unicode.t"/>
    <testcase name="test-failure.t"/>
    <testcase name="test-success.t"/>
  </testsuite>

  $ rt --list-tests test-failure* --json --xunit=xunit.xml --outputdir output
  test-failure-unicode.t
  test-failure.t
  $ cat output/report.json
  testreport ={
      "test-failure-unicode.t": {
          "result": "success"
      },
      "test-failure.t": {
          "result": "success"
      }
  } (no-eol)
  $ cat xunit.xml
  <?xml version="1.0" encoding="utf-8"?>
  <testsuite errors="0" failures="0" name="run-tests" skipped="0" tests="0">
    <testcase name="test-failure-unicode.t"/>
    <testcase name="test-failure.t"/>
  </testsuite>

  $ rm test-failure-unicode.t

test for --retest
====================

  $ rt --retest
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 2 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

--retest works with --outputdir
  $ rm -r output
  $ mkdir output
  $ mv test-failure.t.err output
  $ rt --retest --outputdir output
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/output/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 2 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

Selecting Tests To Run
======================

successful

  $ rt test-success.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

success w/ keyword
  $ rt -k xyzzy
  .
  # Ran 2 tests, 1 skipped, 0 failed.

failed

  $ rt test-failure.t
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

failure w/ keyword
  $ rt -k rataxes
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !
  Failed test-failure.t: output changed
  # Ran 2 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

Verify that when a process fails to start we show a useful message
==================================================================

  $ cat > test-serve-fail.t <<EOF
  >   $ echo 'abort: child process failed to start blah'
  > EOF
  $ rt test-serve-fail.t
  
  --- $TESTTMP/test-serve-fail.t
  +++ $TESTTMP/test-serve-fail.t.err
  @@ -1* +1,2 @@ (glob)
     $ echo 'abort: child process failed to start blah'
  +  abort: child process failed to start blah
  
  ERROR: test-serve-fail.t output changed
  !
  Failed test-serve-fail.t: server failed to start (HGPORT=*) (glob)
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]
  $ rm test-serve-fail.t

Verify that we can try other ports
===================================
  $ hg init inuse
  $ hg serve -R inuse -p $HGPORT -d --pid-file=blocks.pid
  $ cat blocks.pid >> $DAEMON_PIDS
  $ cat > test-serve-inuse.t <<EOF
  >   $ hg serve -R `pwd`/inuse -p \$HGPORT -d --pid-file=hg.pid
  >   $ cat hg.pid >> \$DAEMON_PIDS
  > EOF
  $ rt test-serve-inuse.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.
  $ rm test-serve-inuse.t
  $ killdaemons.py $DAEMON_PIDS
  $ rm $DAEMON_PIDS

Running In Debug Mode
======================

  $ rt --debug 2>&1 | grep -v pwd
  + echo *SALT* 0 0 (glob)
  *SALT* 0 0 (glob)
  + echo babar
  babar
  + echo *SALT* 10 0 (glob)
  *SALT* 10 0 (glob)
  *+ echo *SALT* 0 0 (glob)
  *SALT* 0 0 (glob)
  + echo babar
  babar
  + echo *SALT* 2 0 (glob)
  *SALT* 2 0 (glob)
  + echo xyzzy
  xyzzy
  + echo *SALT* 9 0 (glob)
  *SALT* 9 0 (glob)
  + printf *abc\ndef\nxyz\n* (glob)
  abc
  def
  xyz
  + echo *SALT* 15 0 (glob)
  *SALT* 15 0 (glob)
  + printf *zyx\nwvu\ntsr\n* (glob)
  zyx
  wvu
  tsr
  + echo *SALT* 22 0 (glob)
  *SALT* 22 0 (glob)
  .
  # Ran 2 tests, 0 skipped, 0 failed.

Parallel runs
==============

(duplicate the failing test to get predictable output)
  $ cp test-failure.t test-failure-copy.t

  $ rt --jobs 2 test-failure*.t -n
  !!
  Failed test-failure*.t: output changed (glob)
  Failed test-failure*.t: output changed (glob)
  # Ran 2 tests, 0 skipped, 2 failed.
  python hash seed: * (glob)
  [1]

failures in parallel with --first should only print one failure
  $ rt --jobs 2 --first test-failure*.t
  
  --- $TESTTMP/test-failure*.t (glob)
  +++ $TESTTMP/test-failure*.t.err (glob)
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  Failed test-failure*.t: output changed (glob)
  Failed test-failure*.t: output changed (glob)
  # Ran 2 tests, 0 skipped, 2 failed.
  python hash seed: * (glob)
  [1]


(delete the duplicated test file)
  $ rm test-failure-copy.t


Interactive run
===============

(backup the failing test)
  $ cp test-failure.t backup

Refuse the fix

  $ echo 'n' | rt -i
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  Accept this change? [n] 
  ERROR: test-failure.t output changed
  !.
  Failed test-failure.t: output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ cat test-failure.t
    $ echo babar
    rataxes
  This is a noop statement so that
  this test is still more bytes than success.
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................

Interactive with custom view

  $ echo 'n' | rt -i --view echo
  $TESTTMP/test-failure.t $TESTTMP/test-failure.t.err
  Accept this change? [n]* (glob)
  ERROR: test-failure.t output changed
  !.
  Failed test-failure.t: output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

View the fix

  $ echo 'y' | rt --view echo
  $TESTTMP/test-failure.t $TESTTMP/test-failure.t.err
  
  ERROR: test-failure.t output changed
  !.
  Failed test-failure.t: output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

Accept the fix

  $ cat >> test-failure.t <<EOF
  >   $ echo 'saved backup bundle to \$TESTTMP/foo.hg'
  >   saved backup bundle to \$TESTTMP/foo.hg
  >   $ echo 'saved backup bundle to \$TESTTMP/foo.hg'
  >   saved backup bundle to $TESTTMP\\foo.hg
  >   $ echo 'saved backup bundle to \$TESTTMP/foo.hg'
  >   saved backup bundle to \$TESTTMP/*.hg (glob)
  > EOF
  $ echo 'y' | rt -i 2>&1
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  @@ -11,6 +11,6 @@
     $ echo 'saved backup bundle to $TESTTMP/foo.hg'
     saved backup bundle to $TESTTMP/foo.hg
     $ echo 'saved backup bundle to $TESTTMP/foo.hg'
  -  saved backup bundle to $TESTTMP\foo.hg
  +  saved backup bundle to $TESTTMP/foo.hg
     $ echo 'saved backup bundle to $TESTTMP/foo.hg'
     saved backup bundle to $TESTTMP/*.hg (glob)
  Accept this change? [n] ..
  # Ran 2 tests, 0 skipped, 0 failed.

  $ sed -e 's,(glob)$,&<,g' test-failure.t
    $ echo babar
    babar
  This is a noop statement so that
  this test is still more bytes than success.
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
  pad pad pad pad............................................................
    $ echo 'saved backup bundle to $TESTTMP/foo.hg'
    saved backup bundle to $TESTTMP/foo.hg
    $ echo 'saved backup bundle to $TESTTMP/foo.hg'
    saved backup bundle to $TESTTMP/foo.hg
    $ echo 'saved backup bundle to $TESTTMP/foo.hg'
    saved backup bundle to $TESTTMP/*.hg (glob)<

Race condition - test file was modified when test is running

  $ TESTRACEDIR=`pwd`
  $ export TESTRACEDIR
  $ cat > test-race.t <<EOF
  >   $ echo 1
  >   $ echo "# a new line" >> $TESTRACEDIR/test-race.t
  > EOF

  $ rt -i test-race.t
  
  --- $TESTTMP/test-race.t
  +++ $TESTTMP/test-race.t.err
  @@ -1,2 +1,3 @@
     $ echo 1
  +  1
     $ echo "# a new line" >> $TESTTMP/test-race.t
  Reference output has changed (run again to prompt changes)
  ERROR: test-race.t output changed
  !
  Failed test-race.t: output changed
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ rm test-race.t

When "#testcases" is used in .t files

  $ cat >> test-cases.t <<EOF
  > #testcases a b
  > #if a
  >   $ echo 1
  > #endif
  > #if b
  >   $ echo 2
  > #endif
  > EOF

  $ cat <<EOF | rt -i test-cases.t 2>&1
  > y
  > y
  > EOF
  
  --- $TESTTMP/test-cases.t
  +++ $TESTTMP/test-cases.t.a.err
  @@ -1,6 +1,7 @@
   #testcases a b
   #if a
     $ echo 1
  +  1
   #endif
   #if b
     $ echo 2
  Accept this change? [n] .
  --- $TESTTMP/test-cases.t
  +++ $TESTTMP/test-cases.t.b.err
  @@ -5,4 +5,5 @@
   #endif
   #if b
     $ echo 2
  +  2
   #endif
  Accept this change? [n] .
  # Ran 2 tests, 0 skipped, 0 failed.

  $ cat test-cases.t
  #testcases a b
  #if a
    $ echo 1
    1
  #endif
  #if b
    $ echo 2
    2
  #endif

  $ cat >> test-cases.t <<'EOF'
  > #if a
  >   $ NAME=A
  > #else
  >   $ NAME=B
  > #endif
  >   $ echo $NAME
  >   A (a !)
  >   B (b !)
  > EOF
  $ rt test-cases.t
  ..
  # Ran 2 tests, 0 skipped, 0 failed.

  $ rm test-cases.t

(reinstall)
  $ mv backup test-failure.t

No Diff
===============

  $ rt --nodiff
  !.
  Failed test-failure.t: output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

test --tmpdir support
  $ rt --tmpdir=$TESTTMP/keep test-success.t
  
  Keeping testtmp dir: $TESTTMP/keep/child1/test-success.t
  Keeping threadtmp dir: $TESTTMP/keep/child1 
  .
  # Ran 1 tests, 0 skipped, 0 failed.

timeouts
========
  $ cat > test-timeout.t <<EOF
  >   $ sleep 2
  >   $ echo pass
  >   pass
  > EOF
  > echo '#require slow' > test-slow-timeout.t
  > cat test-timeout.t >> test-slow-timeout.t
  $ rt --timeout=1 --slowtimeout=3 test-timeout.t test-slow-timeout.t
  st
  Skipped test-slow-timeout.t: missing feature: allow slow tests (use --allow-slow-tests)
  Failed test-timeout.t: timed out
  # Ran 1 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]
  $ rt --timeout=1 --slowtimeout=3 \
  > test-timeout.t test-slow-timeout.t --allow-slow-tests
  .t
  Failed test-timeout.t: timed out
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]
  $ rm test-timeout.t test-slow-timeout.t

test for --time
==================

  $ rt test-success.t --time
  .
  # Ran 1 tests, 0 skipped, 0 failed.
  # Producing time report
  start   end     cuser   csys    real      Test
  \s*[\d\.]{5}   \s*[\d\.]{5}   \s*[\d\.]{5}   \s*[\d\.]{5}   \s*[\d\.]{5}   test-success.t (re)

test for --time with --job enabled
====================================

  $ rt test-success.t --time --jobs 2
  .
  # Ran 1 tests, 0 skipped, 0 failed.
  # Producing time report
  start   end     cuser   csys    real      Test
  \s*[\d\.]{5}   \s*[\d\.]{5}   \s*[\d\.]{5}   \s*[\d\.]{5}   \s*[\d\.]{5}   test-success.t (re)

Skips
================
  $ cat > test-skip.t <<EOF
  >   $ echo xyzzy
  > #require false
  > EOF
  $ rt --nodiff
  !.s
  Skipped test-skip.t: missing feature: nail clipper
  Failed test-failure.t: output changed
  # Ran 2 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ rt --keyword xyzzy
  .s
  Skipped test-skip.t: missing feature: nail clipper
  # Ran 2 tests, 2 skipped, 0 failed.

Skips with xml
  $ rt --keyword xyzzy \
  >  --xunit=xunit.xml
  .s
  Skipped test-skip.t: missing feature: nail clipper
  # Ran 2 tests, 2 skipped, 0 failed.
  $ cat xunit.xml
  <?xml version="1.0" encoding="utf-8"?>
  <testsuite errors="0" failures="0" name="run-tests" skipped="2" tests="2">
    <testcase name="test-success.t" time="*"/> (glob)
    <testcase name="test-skip.t">
      <skipped>
  <![CDATA[missing feature: nail clipper]]>    </skipped>
    </testcase>
  </testsuite>

Missing skips or blacklisted skips don't count as executed:
  $ echo test-failure.t > blacklist
  $ rt --blacklist=blacklist --json\
  >   test-failure.t test-bogus.t
  ss
  Skipped test-bogus.t: Doesn't exist
  Skipped test-failure.t: blacklisted
  # Ran 0 tests, 2 skipped, 0 failed.
  $ cat report.json
  testreport ={
      "test-bogus.t": {
          "result": "skip"
      },
      "test-failure.t": {
          "result": "skip"
      }
  } (no-eol)

Whitelist trumps blacklist
  $ echo test-failure.t > whitelist
  $ rt --blacklist=blacklist --whitelist=whitelist --json\
  >   test-failure.t test-bogus.t
  s
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !
  Skipped test-bogus.t: Doesn't exist
  Failed test-failure.t: output changed
  # Ran 1 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

Ensure that --test-list causes only the tests listed in that file to
be executed.
  $ echo test-success.t >> onlytest
  $ rt --test-list=onlytest
  .
  # Ran 1 tests, 0 skipped, 0 failed.
  $ echo test-bogus.t >> anothertest
  $ rt --test-list=onlytest --test-list=anothertest
  s.
  Skipped test-bogus.t: Doesn't exist
  # Ran 1 tests, 1 skipped, 0 failed.
  $ rm onlytest anothertest

test for --json
==================

  $ rt --json
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !.s
  Skipped test-skip.t: missing feature: nail clipper
  Failed test-failure.t: output changed
  # Ran 2 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ cat report.json
  testreport ={
      "test-failure.t": [\{] (re)
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "---.+\+\+\+.+", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "failure", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }, ? (re)
      "test-skip.t": {
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "skip", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }, ? (re)
      "test-success.t": [\{] (re)
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "success", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }
  } (no-eol)
--json with --outputdir

  $ rm report.json
  $ rm -r output
  $ mkdir output
  $ rt --json --outputdir output
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/output/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  
  ERROR: test-failure.t output changed
  !.s
  Skipped test-skip.t: missing feature: nail clipper
  Failed test-failure.t: output changed
  # Ran 2 tests, 1 skipped, 1 failed.
  python hash seed: * (glob)
  [1]
  $ f report.json
  report.json: file not found
  $ cat output/report.json
  testreport ={
      "test-failure.t": [\{] (re)
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "---.+\+\+\+.+", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "failure", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }, ? (re)
      "test-skip.t": {
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "skip", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }, ? (re)
      "test-success.t": [\{] (re)
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "success", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }
  } (no-eol)
  $ ls -a output
  .
  ..
  .testtimes
  report.json
  test-failure.t.err

Test that failed test accepted through interactive are properly reported:

  $ cp test-failure.t backup
  $ echo y | rt --json -i
  
  --- $TESTTMP/test-failure.t
  +++ $TESTTMP/test-failure.t.err
  @@ -1,5 +1,5 @@
     $ echo babar
  -  rataxes
  +  babar
   This is a noop statement so that
   this test is still more bytes than success.
   pad pad pad pad............................................................
  Accept this change? [n] ..s
  Skipped test-skip.t: missing feature: nail clipper
  # Ran 2 tests, 1 skipped, 0 failed.

  $ cat report.json
  testreport ={
      "test-failure.t": [\{] (re)
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "success", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }, ? (re)
      "test-skip.t": {
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "skip", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }, ? (re)
      "test-success.t": [\{] (re)
          "csys": "\s*[\d\.]{4,5}", ? (re)
          "cuser": "\s*[\d\.]{4,5}", ? (re)
          "diff": "", ? (re)
          "end": "\s*[\d\.]{4,5}", ? (re)
          "result": "success", ? (re)
          "start": "\s*[\d\.]{4,5}", ? (re)
          "time": "\s*[\d\.]{4,5}" (re)
      }
  } (no-eol)
  $ mv backup test-failure.t

backslash on end of line with glob matching is handled properly

  $ cat > test-glob-backslash.t << EOF
  >   $ echo 'foo bar \\'
  >   foo * \ (glob)
  > EOF

  $ rt test-glob-backslash.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

  $ rm -f test-glob-backslash.t

Test globbing of local IP addresses
  $ echo 172.16.18.1
  $LOCALIP (glob)
  $ echo dead:beef::1
  $LOCALIP (glob)

Test reusability for third party tools
======================================

  $ mkdir "$TESTTMP"/anothertests
  $ cd "$TESTTMP"/anothertests

test that `run-tests.py` can execute hghave, even if it runs not in
Mercurial source tree.

  $ cat > test-hghave.t <<EOF
  > #require true
  >   $ echo foo
  >   foo
  > EOF
  $ rt test-hghave.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

test that RUNTESTDIR refers the directory, in which `run-tests.py` now
running is placed.

  $ cat > test-runtestdir.t <<EOF
  > - $TESTDIR, in which test-run-tests.t is placed
  > - \$TESTDIR, in which test-runtestdir.t is placed (expanded at runtime)
  > - \$RUNTESTDIR, in which run-tests.py is placed (expanded at runtime)
  > 
  > #if windows
  >   $ test "\$TESTDIR" = "$TESTTMP\anothertests"
  > #else
  >   $ test "\$TESTDIR" = "$TESTTMP"/anothertests
  > #endif
  > If this prints a path, that means RUNTESTDIR didn't equal
  > TESTDIR as it should have.
  >   $ test "\$RUNTESTDIR" = "$TESTDIR" || echo "\$RUNTESTDIR"
  > This should print the start of check-code. If this passes but the
  > previous check failed, that means we found a copy of check-code at whatever
  > RUNTESTSDIR ended up containing, even though it doesn't match TESTDIR.
  >   $ head -n 3 "\$RUNTESTDIR"/../contrib/check-code.py | sed 's@.!.*python@#!USRBINENVPY@'
  >   #!USRBINENVPY
  >   #
  >   # check-code - a style and portability checker for Mercurial
  > EOF
  $ rt test-runtestdir.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

#if execbit

test that TESTDIR is referred in PATH

  $ cat > custom-command.sh <<EOF
  > #!/bin/sh
  > echo "hello world"
  > EOF
  $ chmod +x custom-command.sh
  $ cat > test-testdir-path.t <<EOF
  >   $ custom-command.sh
  >   hello world
  > EOF
  $ rt test-testdir-path.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

#endif

test support for --allow-slow-tests
  $ cat > test-very-slow-test.t <<EOF
  > #require slow
  >   $ echo pass
  >   pass
  > EOF
  $ rt test-very-slow-test.t
  s
  Skipped test-very-slow-test.t: missing feature: allow slow tests (use --allow-slow-tests)
  # Ran 0 tests, 1 skipped, 0 failed.
  $ rt $HGTEST_RUN_TESTS_PURE --allow-slow-tests test-very-slow-test.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

support for running a test outside the current directory
  $ mkdir nonlocal
  $ cat > nonlocal/test-is-not-here.t << EOF
  >   $ echo pass
  >   pass
  > EOF
  $ rt nonlocal/test-is-not-here.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.

support for automatically discovering test if arg is a folder
  $ mkdir tmp && cd tmp

  $ cat > test-uno.t << EOF
  >   $ echo line
  >   line
  > EOF

  $ cp test-uno.t test-dos.t
  $ cd ..
  $ cp -R tmp tmpp
  $ cp tmp/test-uno.t test-solo.t

  $ rt tmp/ test-solo.t tmpp
  .....
  # Ran 5 tests, 0 skipped, 0 failed.
  $ rm -rf tmp tmpp

support for running run-tests.py from another directory
  $ mkdir tmp && cd tmp

  $ cat > useful-file.sh << EOF
  > important command
  > EOF

  $ cat > test-folder.t << EOF
  >   $ cat \$TESTDIR/useful-file.sh
  >   important command
  > EOF

  $ cat > test-folder-fail.t << EOF
  >   $ cat \$TESTDIR/useful-file.sh
  >   important commando
  > EOF

  $ cd ..
  $ rt tmp/test-*.t
  
  --- $TESTTMP/anothertests/tmp/test-folder-fail.t
  +++ $TESTTMP/anothertests/tmp/test-folder-fail.t.err
  @@ -1,2 +1,2 @@
     $ cat $TESTDIR/useful-file.sh
  -  important commando
  +  important command
  
  ERROR: test-folder-fail.t output changed
  !.
  Failed test-folder-fail.t: output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

support for bisecting failed tests automatically
  $ hg init bisect
  $ cd bisect
  $ cat >> test-bisect.t <<EOF
  >   $ echo pass
  >   pass
  > EOF
  $ hg add test-bisect.t
  $ hg ci -m 'good'
  $ cat >> test-bisect.t <<EOF
  >   $ echo pass
  >   fail
  > EOF
  $ hg ci -m 'bad'
  $ rt --known-good-rev=0 test-bisect.t
  
  --- $TESTTMP/anothertests/bisect/test-bisect.t
  +++ $TESTTMP/anothertests/bisect/test-bisect.t.err
  @@ -1,4 +1,4 @@
     $ echo pass
     pass
     $ echo pass
  -  fail
  +  pass
  
  ERROR: test-bisect.t output changed
  !
  Failed test-bisect.t: output changed
  test-bisect.t broken by 72cbf122d116 (bad)
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ cd ..

support bisecting a separate repo

  $ hg init bisect-dependent
  $ cd bisect-dependent
  $ cat > test-bisect-dependent.t <<EOF
  >   $ tail -1 \$TESTDIR/../bisect/test-bisect.t
  >     pass
  > EOF
  $ hg commit -Am dependent test-bisect-dependent.t

  $ rt --known-good-rev=0 test-bisect-dependent.t
  
  --- $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t
  +++ $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t.err
  @@ -1,2 +1,2 @@
     $ tail -1 $TESTDIR/../bisect/test-bisect.t
  -    pass
  +    fail
  
  ERROR: test-bisect-dependent.t output changed
  !
  Failed test-bisect-dependent.t: output changed
  Failed to identify failure point for test-bisect-dependent.t
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ rt --bisect-repo=../test-bisect test-bisect-dependent.t
  usage: run-tests.py [options] [tests]
  run-tests.py: error: --bisect-repo cannot be used without --known-good-rev
  [2]

  $ rt --known-good-rev=0 --bisect-repo=../bisect test-bisect-dependent.t
  
  --- $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t
  +++ $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t.err
  @@ -1,2 +1,2 @@
     $ tail -1 $TESTDIR/../bisect/test-bisect.t
  -    pass
  +    fail
  
  ERROR: test-bisect-dependent.t output changed
  !
  Failed test-bisect-dependent.t: output changed
  test-bisect-dependent.t broken by 72cbf122d116 (bad)
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

  $ cd ..

Test a broken #if statement doesn't break run-tests threading.
==============================================================
  $ mkdir broken
  $ cd broken
  $ cat > test-broken.t <<EOF
  > true
  > #if notarealhghavefeature
  >   $ false
  > #endif
  > EOF
  $ for f in 1 2 3 4 ; do
  > cat > test-works-$f.t <<EOF
  > This is test case $f
  >   $ sleep 1
  > EOF
  > done
  $ rt -j 2
  ....
  # Ran 5 tests, 0 skipped, 0 failed.
  skipped: unknown feature: notarealhghavefeature
  
  $ cd ..
  $ rm -rf broken

Test cases in .t files
======================
  $ mkdir cases
  $ cd cases
  $ cat > test-cases-abc.t <<'EOF'
  > #testcases A B C
  >   $ V=B
  > #if A
  >   $ V=A
  > #endif
  > #if C
  >   $ V=C
  > #endif
  >   $ echo $V | sed 's/A/C/'
  >   C
  > #if C
  >   $ [ $V = C ]
  > #endif
  > #if A
  >   $ [ $V = C ]
  >   [1]
  > #endif
  > #if no-C
  >   $ [ $V = C ]
  >   [1]
  > #endif
  >   $ [ $V = D ]
  >   [1]
  > EOF
  $ rt
  .
  --- $TESTTMP/anothertests/cases/test-cases-abc.t
  +++ $TESTTMP/anothertests/cases/test-cases-abc.t.B.err
  @@ -7,7 +7,7 @@
     $ V=C
   #endif
     $ echo $V | sed 's/A/C/'
  -  C
  +  B
   #if C
     $ [ $V = C ]
   #endif
  
  ERROR: test-cases-abc.t (case B) output changed
  !.
  Failed test-cases-abc.t (case B): output changed
  # Ran 3 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

--restart works

  $ rt --restart
  
  --- $TESTTMP/anothertests/cases/test-cases-abc.t
  +++ $TESTTMP/anothertests/cases/test-cases-abc.t.B.err
  @@ -7,7 +7,7 @@
     $ V=C
   #endif
     $ echo $V | sed 's/A/C/'
  -  C
  +  B
   #if C
     $ [ $V = C ]
   #endif
  
  ERROR: test-cases-abc.t (case B) output changed
  !.
  Failed test-cases-abc.t (case B): output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

--restart works with outputdir

  $ mkdir output
  $ mv test-cases-abc.t.B.err output
  $ rt --restart --outputdir output
  
  --- $TESTTMP/anothertests/cases/test-cases-abc.t
  +++ $TESTTMP/anothertests/cases/output/test-cases-abc.t.B.err
  @@ -7,7 +7,7 @@
     $ V=C
   #endif
     $ echo $V | sed 's/A/C/'
  -  C
  +  B
   #if C
     $ [ $V = C ]
   #endif
  
  ERROR: test-cases-abc.t (case B) output changed
  !.
  Failed test-cases-abc.t (case B): output changed
  # Ran 2 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

Test TESTCASE variable

  $ cat > test-cases-ab.t <<'EOF'
  >   $ dostuff() {
  >   >   echo "In case $TESTCASE"
  >   > }
  > #testcases A B
  > #if A
  >   $ dostuff
  >   In case A
  > #endif
  > #if B
  >   $ dostuff
  >   In case B
  > #endif
  > EOF
  $ rt test-cases-ab.t
  ..
  # Ran 2 tests, 0 skipped, 0 failed.

Test automatic pattern replacement

  $ cat << EOF >> common-pattern.py
  > substitutions = [
  >     (br'foo-(.*)\\b',
  >      br'\$XXX=\\1\$'),
  >     (br'bar\\n',
  >      br'\$YYY$\\n'),
  > ]
  > EOF

  $ cat << EOF >> test-substitution.t
  >   $ echo foo-12
  >   \$XXX=12$
  >   $ echo foo-42
  >   \$XXX=42$
  >   $ echo bar prior
  >   bar prior
  >   $ echo lastbar
  >   last\$YYY$
  >   $ echo foo-bar foo-baz
  > EOF

  $ rt test-substitution.t
  
  --- $TESTTMP/anothertests/cases/test-substitution.t
  +++ $TESTTMP/anothertests/cases/test-substitution.t.err
  @@ -7,3 +7,4 @@
     $ echo lastbar
     last$YYY$
     $ echo foo-bar foo-baz
  +  $XXX=bar foo-baz$
  
  ERROR: test-substitution.t output changed
  !
  Failed test-substitution.t: output changed
  # Ran 1 tests, 0 skipped, 1 failed.
  python hash seed: * (glob)
  [1]

--extra-config-opt works

  $ cat << EOF >> test-config-opt.t
  >   $ hg init test-config-opt
  >   $ hg -R test-config-opt purge
  > EOF

  $ rt --extra-config-opt extensions.purge= test-config-opt.t
  .
  # Ran 1 tests, 0 skipped, 0 failed.