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 warned, 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 warned, 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
an empty test
=======================
$ touch test-empty.t
$ rt
.
# Ran 1 tests, 0 skipped, 0 warned, 0 failed.
$ rm test-empty.t
a succesful test
=======================
$ cat > test-success.t << EOF
> $ echo babar
> babar
> $ echo xyzzy
> never*happens (glob) (?)
> xyzzy
> nor this (?)
> $ printf 'abc\ndef\nxyz\n'
> 123 (?)
> abc
> def (?)
> 456 (?)
> xyz
> EOF
$ rt
.
# Ran 1 tests, 0 skipped, 0 warned, 0 failed.
failing test
==================
test churn with globs
$ cat > test-failure.t <<EOF
> $ echo "bar-baz"; echo "bar-bad"
> bar*bad (glob)
> bar*baz (glob)
> EOF
$ rt test-failure.t
--- $TESTTMP/test-failure.t
+++ $TESTTMP/test-failure.t.err
@@ -1,3 +1,3 @@
$ echo "bar-baz"; echo "bar-bad"
+ bar*baz (glob)
bar*bad (glob)
- bar*baz (glob)
ERROR: test-failure.t output changed
!
Failed test-failure.t: output changed
# Ran 1 tests, 0 skipped, 0 warned, 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............................................................
> 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, 0 warned, 2 failed.
python hash seed: * (glob)
[1]
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, 0 warned, 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)
<![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)
]]> </testcase>
<testcase name="test-failure.t" time="*"> (glob)
<![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............................................................
]]> </testcase>
</testsuite>
$ cat .testtimes
test-failure-unicode.t * (glob)
test-failure.t * (glob)
test-success.t * (glob)
$ 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, 0 warned, 1 failed.
python hash seed: * (glob)
[1]
Selecting Tests To Run
======================
successful
$ rt test-success.t
.
# Ran 1 tests, 0 skipped, 0 warned, 0 failed.
success w/ keyword
$ rt -k xyzzy
.
# Ran 2 tests, 1 skipped, 0 warned, 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, 0 warned, 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, 0 warned, 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
ERROR: test-serve-fail.t output changed
!
Failed test-serve-fail.t: server failed to start (HGPORT=*) (glob)
# Ran 1 tests, 0 skipped, 0 warned, 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 warned, 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* 6 0 (glob)
*SALT* 6 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* 6 0 (glob)
*SALT* 6 0 (glob)
+ printf *abc\ndef\nxyz\n* (glob)
abc
def
xyz
+ echo *SALT* 12 0 (glob)
*SALT* 12 0 (glob)
.
# Ran 2 tests, 0 skipped, 0 warned, 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, 0 warned, 2 failed.
python hash seed: * (glob)
[1]
failures in parallel with --first should only print one failure
>>> f = open('test-nothing.t', 'w')
>>> f.write('foo\n' * 1024) and None
>>> f.write(' $ sleep 1') and None
$ rt --jobs 2 --first
--- $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-nothing.t: output changed
# Ran 2 tests, 0 skipped, 0 warned, 2 failed.
python hash seed: * (glob)
[1]
(delete the duplicated test file)
$ rm test-failure-copy.t test-nothing.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, 0 warned, 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............................................................
Interactive with custom view
$ echo 'n' | rt -i --view echo
$TESTTMP/test-failure.t $TESTTMP/test-failure.t.err (glob)
Accept this change? [n]* (glob)
ERROR: test-failure.t output changed
!.
Failed test-failure.t: output changed
# Ran 2 tests, 0 skipped, 0 warned, 1 failed.
python hash seed: * (glob)
[1]
View the fix
$ echo 'y' | rt --view echo
$TESTTMP/test-failure.t $TESTTMP/test-failure.t.err (glob)
ERROR: test-failure.t output changed
!.
Failed test-failure.t: output changed
# Ran 2 tests, 0 skipped, 0 warned, 1 failed.
python hash seed: * (glob)
[1]
Accept the fix
$ echo " $ echo 'saved backup bundle to \$TESTTMP/foo.hg'" >> test-failure.t
$ echo " saved backup bundle to \$TESTTMP/foo.hg" >> test-failure.t
$ echo " $ echo 'saved backup bundle to \$TESTTMP/foo.hg'" >> test-failure.t
$ echo " saved backup bundle to \$TESTTMP/foo.hg (glob)" >> test-failure.t
$ echo " $ echo 'saved backup bundle to \$TESTTMP/foo.hg'" >> test-failure.t
$ echo " saved backup bundle to \$TESTTMP/*.hg (glob)" >> test-failure.t
$ echo 'y' | rt -i 2>&1
--- $TESTTMP/test-failure.t
+++ $TESTTMP/test-failure.t.err
@@ -1,11 +1,11 @@
$ echo babar
- rataxes
+ babar
This is a noop statement so that
this test is still more bytes than success.
pad pad pad pad............................................................
pad pad pad pad............................................................
$ echo 'saved backup bundle to $TESTTMP/foo.hg'
- saved backup bundle to $TESTTMP/foo.hg
+ saved backup bundle to $TESTTMP/foo.hg* (glob)
$ echo 'saved backup bundle to $TESTTMP/foo.hg'
saved backup bundle to $TESTTMP/foo.hg* (glob)
$ echo 'saved backup bundle to $TESTTMP/foo.hg'
Accept this change? [n] ..
# Ran 2 tests, 0 skipped, 0 warned, 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............................................................
$ echo 'saved backup bundle to $TESTTMP/foo.hg'
saved backup bundle to $TESTTMP/foo.hg (glob)<
$ echo 'saved backup bundle to $TESTTMP/foo.hg'
saved backup bundle to $TESTTMP/foo.hg (glob)<
$ echo 'saved backup bundle to $TESTTMP/foo.hg'
saved backup bundle to $TESTTMP/*.hg (glob)<
(reinstall)
$ mv backup test-failure.t
No Diff
===============
$ rt --nodiff
!.
Failed test-failure.t: output changed
# Ran 2 tests, 0 skipped, 0 warned, 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 (glob)
Keeping threadtmp dir: $TESTTMP/keep/child1 (glob)
.
# Ran 1 tests, 0 skipped, 0 warned, 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
Failed test-timeout.t: timed out
# Ran 1 tests, 1 skipped, 0 warned, 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, 0 warned, 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 warned, 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 warned, 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, 0 warned, 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 warned, 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 warned, 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)
</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 warned, 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, 0 warned, 1 failed.
python hash seed: * (glob)
[1]
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, 0 warned, 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)
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 warned, 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 warned, 0 failed.
$ rm -f test-glob-backslash.t
Test globbing of 127.0.0.1
$ echo 172.16.18.1
127.0.0.1 (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 warned, 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
> $ test "\$RUNTESTDIR" = "$TESTDIR"
> $ head -n 3 "\$RUNTESTDIR"/../contrib/check-code.py
> #!/usr/bin/env python
> #
> # check-code - a style and portability checker for Mercurial
> EOF
$ rt test-runtestdir.t
.
# Ran 1 tests, 0 skipped, 0 warned, 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 warned, 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
# Ran 0 tests, 1 skipped, 0 warned, 0 failed.
$ rt $HGTEST_RUN_TESTS_PURE --allow-slow-tests test-very-slow-test.t
.
# Ran 1 tests, 0 skipped, 0 warned, 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 warned, 0 failed.
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, 0 warned, 1 failed.
python hash seed: * (glob)
[1]