Skip the parts that cannot be run on the host due to lack
of IPv6 support or a second interface to bind on, and warn
appropriately.
Without no strong requirements (besides being Linux only, in which case
the test is skipped) left, just add this test to the default in
test_runner.
Includes suggested changes by John Newbery.
bip9-sofforks.py was intended to be a generic test for versionbits
deployments. However, it only tests CSV activation and was not updated
to test segwit activation. CSV activation is tested by
bip68-112-113-p2p.py, so this test is duplicated effort.
Rather than try to update it to use the BitcoinTestFramework, just
remove it.
b55555d rpc: Add testmempoolaccept (MarcoFalke)
Pull request description:
To check if a single raw transaction makes it into the current transaction pool, one had to call `sendrawtransaction`. However, on success, this adds the transaction to the mempool with no easy way to undo.
The call `testmempoolaccept` is introduced to provide a way to solely check the result without changing the mempool state.
Tree-SHA512: 5afd9311190135cee8fc1f229c7d39bf893f1028f29e28d34f70df820198ff97b4bf86b41cbbd6e6c36a5c30073cefa92d541c74a4939c7a2a6fa283dfd41b63
a192636 -blocksdir: keep blockindex leveldb database in datadir (Jonas Schnelli)
f38e4fd QA: Add -blocksdir test (Jonas Schnelli)
386a6b6 Allow to optional specify the directory for the blocks storage (Jonas Schnelli)
Pull request description:
Since the actual block files taking up more and more space, it may be desirable to have them stored in a different location then the data directory (use case: SSD for chainstate, etc., HD for blocks).
This PR adds a `-blocksdir` option that allows one to keep the blockfiles and the blockindex external from the data directory (instead of creating symlinks).
I fist had an option to keep the blockindex within the datadir, but seems to make no sense since accessing the index will (always) lead to access (r/w) the block files.
Tree-SHA512: f8b9e1a681679eac25076dc30e45e6e12d4b2d9ac4be907cbea928a75af081dbcb0f1dd3e97169ab975f73d0bd15824c00c2a34638f3b284b39017171fce2409
3f592b8 [QA] add wallet-rbf test (Jonas Schnelli)
8222e05 Disable wallet fallbackfee by default on mainnet (Jonas Schnelli)
Pull request description:
Removes the default fallback fee on mainnet (but keeps it on testnet/regtest).
Transactions using the fallbackfee in case the fallback fee has not been set are getting rejected.
Tree-SHA512: e54d2594b7f954e640cc513a18b0bfbe189f15e15bdeed4fe02b7677f939bca1731fef781b073127ffd4ce08a595fb118259b8826cdaa077ff7d5ae9495810db
faefd29 qa: Prepare functional tests for Windows (MarcoFalke)
Pull request description:
* Pass `sys.executable` when calling a python script via the subprocess
module
* Don't remove the log file while it is still open and written to
* Properly use os.pathsep and os.path.sep when modifying the PATH
environment variable
* util-tests: Use os.path.join for Windows compatibility
Ref: #8227
Tree-SHA512: c507a536af104b3bde4366b6634099db826532bd3e7c35d694b5883c550920643b3eab79c76703ca67e1044ed09979e855088f7324321c8d52112514e334d614
* Pass `sys.executable` when calling a python script via the subprocess
module
* Don't remove the log file while it is still open and written to
* Properly use os.pathsep and os.path.sep when modifying the PATH
environment variable
* util-tests: Use os.path.join for Windows compatibility
5fecd84 [tests] Remove redundant import in blocktools.py test (Anthony Towns)
9b20bb4 [tests] Check tests conform to naming convention (Anthony Towns)
7250b4e [tests] README.md nit fixes (Anthony Towns)
82b2712 [tests] move witness util functions to blocktools.py (John Newbery)
1e10854 [tests] [docs] update README for new test naming scheme (John Newbery)
Pull request description:
Splitting #11774 into two parts -- this part updates the README with the proposed naming convention, and adds some checks to test_runner.py that the number of tests violating the naming convention doesn't increase too much. Idea is this part of the change should not introduce merge conflicts or require much rebasing, so reviews of the complicated bits won't become invalidated too often; while the second part will just be file renames, which will require regular rebasing and will introduce merge conflicts with pending PRs, but can be merged later, and should also be much easier to review, since it will only include relatively trivial changes.
Tree-SHA512: b96557d41714addbbfe2aed62fb5a48639eaeb1eb3aba30ac1b3a86bb3cb8d796c6247f9c414c4695c4bf54c0ec9968ac88e2f88fb62483bc1a2f89368f7fc80
a14dbff39e Allow multiwallet.py to be used with --usecli (Russell Yanofsky)
f6ade9ce1a [tests] allow tests to be run with --usecli (John Newbery)
ff9a363ff7 TestNodeCLI batch emulation (Russell Yanofsky)
ca9085afc5 Prevent TestNodeCLI.args mixups (Russell Yanofsky)
fcfb952bca Improve TestNodeCLI output parsing (Russell Yanofsky)
Pull request description:
Lack of test coverage was pointed out by @jnewbery in https://github.com/bitcoin/bitcoin/pull/11687#discussion_r158133900
Tree-SHA512: 5f10e31abad11a5edab0da4e2515e39547adb6ab9e55e50427ab2eb7ec9a43d6b896b579b15863e5edc9beee7d8bf1c84d9dabd247be0760a1b9ae39e1e8ee02
b224a47a1 Add address_types test (Pieter Wuille)
7ee54fd7c Support downgrading after recovered keypool witness keys (Pieter Wuille)
940a21932 SegWit wallet support (Pieter Wuille)
f37c64e47 Implicitly know about P2WPKH redeemscripts (Pieter Wuille)
57273f2b3 [test] Serialize CTransaction with witness by default (Pieter Wuille)
cf2c0b6f5 Support P2WPKH and P2SH-P2WPKH in dumpprivkey (Pieter Wuille)
37c03d3e0 Support P2WPKH addresses in create/addmultisig (Pieter Wuille)
3eaa003c8 Extend validateaddress information for P2SH-embedded witness (Pieter Wuille)
30a27dc5b Expose method to find key for a single-key destination (Pieter Wuille)
985c79552 Improve witness destination types and use them more (Pieter Wuille)
cbe197470 [refactor] GetAccount{PubKey,Address} -> GetAccountDestination (Pieter Wuille)
0c8ea6380 Abstract out IsSolvable from Witnessifier (Pieter Wuille)
Pull request description:
This implements a minimum viable implementation of SegWit wallet support, based on top of #11389, and includes part of the functionality from #11089.
Two new configuration options are added:
* `-addresstype`, with options `legacy`, `p2sh`, and `bech32`. It controls what kind of addresses are produced by `getnewaddress`, `getaccountaddress`, and `createmultisigaddress`.
* `-changetype`, with the same options, and by default equal to `-addresstype`, that controls what kind of change is used.
All wallet private and public keys can be used for any type of address. Support for address types dependent on different derivation paths will need a major overhaul of how our internal detection of outputs work. I expect that that will happen for a next major version.
The above also applies to imported keys, as having a distinction there but not for normal operations is a disaster for testing, and probably for comprehension of users. This has some ugly effects, like needing to associate the provided label to `importprivkey` with each style address for the corresponding key.
To deal with witness outputs requiring a corresponding redeemscript in wallet, three approaches are used:
* All SegWit addresses created through `getnewaddress` or multisig RPCs explicitly get their redeemscripts added to the wallet file. This means that downgrading after creating a witness address will work, as long as the wallet file is up to date.
* All SegWit keys in the wallet get an _implicit_ redeemscript added, without it being written to the file. This means recovery of an old backup will work, as long as you use new software.
* All keypool keys that are seen used in transactions explicitly get their redeemscripts added to the wallet files. This means that downgrading after recovering from a backup that includes a witness address will work.
These approaches correspond to solutions 3a, 1a, and 5a respectively from https://gist.github.com/sipa/125cfa1615946d0c3f3eec2ad7f250a2. As argued there, there is no full solution for dealing with the case where you both downgrade and restore a backup, so that's also not implemented.
`dumpwallet`, `importwallet`, `importmulti`, `signmessage` and `verifymessage` don't work with SegWit addresses yet. They're remaining TODOs, for this PR or a follow-up. Because of that, several tests unexpectedly run with `-addresstype=legacy` for now.
Tree-SHA512: d425dbe517c0422061ab8dacdc3a6ae47da071450932ed992c79559d922dff7b2574a31a8c94feccd3761c1dffb6422c50055e6dca8e3cf94a169bc95e39e959
This introduces two command line flags (-addresstype and -changetype) which control
the type of addresses/outputs created by the GUI and RPCs. Certain RPCs allow
overriding these (`getnewaddress` and `getrawchangeaddress`). Supported types
are "legacy" (P2PKH and P2SH-multisig), "p2sh-segwit" (P2SH-P2WPKH and P2SH-P2WSH-multisig),
and "bech32" (P2WPKH and P2WSH-multisig).
A few utility functions are added to the wallet to construct different address type
and to add the necessary entries to the wallet file to be compatible with earlier
versions (see `CWallet::LearnRelatedScripts`, `GetDestinationForKey`,
`GetAllDestinationsForKey`, `CWallet::AddAndGetDestinationForScript`).
595a7ba Increment MIT Licence copyright header year on files modified in 2017 (Akira Takizawa)
Pull request description:
Edited via:
$ contrib/devtools/copyright_header.py update .
ps) It is the same commit as #9450
Tree-SHA512: 274bfcd6cf2914315ed52f6db773a68800ce9d6bd225a3142654483f0bbc3fd865009e62f9d954f65765d038c626e55d2a64e37e16843809adc2f67abe659b6d
5a7c09a test: Add tests for `-debuglogfile` with subdirs (Anthony Towns)
4158734 doc: Update release notes for `-debuglogfile` (Wladimir J. van der Laan)
2323242 test: Add test for `-debuglogfile` (Wladimir J. van der Laan)
cf5f432 Add `-debuglogfile` option (Wladimir J. van der Laan)
Pull request description:
This patch adds an option to configure the name and/or directory of the debug log file.
The user can specify either a relative path, in which case the path is relative to the (network specific) data directory. They can also specify an absolute path to put the log anywhere else in the file system.
Alternative to #11741 that gets rid of the concept of a "log directory" by specifying the path for the specific kind of log, the debug log. Which happens to be the only kind of log we have at this point*, but a hypothetical new kind of log (say, an audit log) would get a new option. This has more flexibility than specifying a directory which has to contain all of them.
\* excluding `db.log` which is internally generated by the wallet database library, but that one moves along with `-walletdir`.
Tree-SHA512: 4434d0e598dc23504e5c9e67fdbaef56db4f0fd490f9f54fd503e69d4dda9b5b69c539e1794ed841e72161b7b1dc3374d2f1193dd431b057566750e56fd8f24b
Instead of calling combine_logs from test_runner when the environment variable
PYTHON_DEBUG is set, add a combinedlogslen argument. This makes it easier
to call when running locally, and allows a different length of combined logs
to be printed.
c5dfa90 [tests] Add uacomment tests (Cristian Mircea Messel)
Pull request description:
Checks for setting the value, max length and reserved characters
Tree-SHA512: a62e2cf8e455a3cd3987c0855f7bfc49de47504c01263e3573366e3cbff400c5678224773d4f1e4ac684fff34d987994e490a0978c4da05ff2a4bfa972c84723
857b32b [tests] Add -walletnotify functional test (João Barbosa)
df18d29 [tests] Add -blocknotify functional test (João Barbosa)
9c72a46 [tests] Tidy up forknotify.py (John Newbery)
Pull request description:
This patch adds the missing functional tests for `-blocknotify` and `-walletnotify` notifications. The `-alertnotify` test file `forknotify.py` is renamed to `notifications.py` to accommodate the new tests. Credits to @jnewbery for this cleanup and unification.
Tree-SHA512: ee7b28b9f1bd225587efaefa6427c6d080ccb50ead390b23d94717c137a317183b37be00da0b2bffedd4192a363c971dea510d78d29278eb9fa76374f7855c09
Nodes don't consider themselves out of "initial block download" until
their active chain has more work than nMinimumChainWork.
While in initial block download, nodes won't relay blocks to their
peers, so test that this parameter functions as intended by verifying
that block relay only succeeds past a given node once its
nMinimumChainWork has been exceeded.
c6ec4358a [tests] Add bitcoin_cli.py test script (John Newbery)
b23549f6e [tests] add TestNodeCLI class for calling bitcoin-cli for a node (John Newbery)
Pull request description:
We don't test bitcoin-cli at all. That means that we can miss inconsistencies between the bitcoin-cli client and the RPC interface, such as #10698 and #10747. It also means that the various bitcoin-cli options and features are untested and regressions could be silently introduced.
Let's fix that.
This PR adds bitcoin-cli testing in the python functional test_framework:
1. Add a bitcoin_cli.py test script that tests bitcoin-cli. At the moment it only tests that the result of `getinfo` is the same if you run it as an RPC or through bitcoin-cli, but can easily be extended to test additional bitcoin-cli features
**EDIT: `--usecli` option is moved to a separate PR. This PR now only covers the bitcoin_cli.py test.**
2. ~Add a `--usecli` option to the test framework. This changes the test to use bitcoin-cli for all RPC calls instead of using direct HTTP requests. This is somewhat experimental. It works for most tests, but there are some cases where it can't work transparently because:~
- ~the testcase is asserting on a specific error code, and bitcoin-cli returns a different error code from the direct RPC~
- ~we're sending a very large RPC request (eg `submitblock`) and it can't be serialized into a shell bitcoin-cli call.~
~I think that even though `--usecli` doesn't work on all tests, it's still a useful experimental feature. Future potential enhancements:~
- ~enhance the framework to automatically skip tests that are known to fail with bitcoin-cli if the `--usecli` option is used.~
- ~run a subset of tests in Travis with `-usecli`~
This builds on and requires the `TestNode` PR #10711 . As an aside, this is a good demonstration of how tidy it is to add additional features/interfaces now that test node logic/state is encapsulated in a TestNode class.
Addresses #10791
Tree-SHA512: a1e6be12e8e007f6f67b3d3bbcd142d835787300831eb38e6027a1ad25ca9d79c4bc99a41b19e31ee95205cba1b3b2d21a688b5909316aad70bfc2b4eb6d8a52
1d8df0141 Fix MD formatting in REST-interface.md and spelling mistake in test_runner.py (MeshCollider)
41f3e84aa Fix inconsistencies and grammar in various files (MeshCollider)
Pull request description:
Just a simple fix of some inconsistent capitalization, formatting and grammar in a few files (no code changes)
Tree-SHA512: 60b12a5a5c69a1af4a25b7db0b32ed806ed62ad2966cee08b3792a7cfa7f51848fd485349b4c09e60a7eedfdf55ee730c51daa066d6e226ae404c93342bf3e13
f42fc1d50 doc: spelling fixes (klemens)
Pull request description:
patch contains some spelling fixes ( just in comments ) as found by a bot ( http://www.misfix.org, https://github.com/ka7/misspell_fixer ).
Tree-SHA512: ba6046cfcd81b0783420daae7d776be92dd7b85a593e212f8f1b4403aca9b1b6af12cef7080d4ea5ed4a14952fd25e4300109a59c414e08f5395cdb9947bb750
d34957e [wallet] [tests] Add keypool topup functional test (Jonas Schnelli)
095142d [wallet] keypool mark-used and topup (John Newbery)
c25d90f [wallet] Add HasUnusedKeys() helper (John Newbery)
f2123e3 [wallet] Cache keyid -> keypool id mappings (John Newbery)
83f1ec3 [wallet] Don't hold cs_LastBlockFile while calling setBestChain (John Newbery)
2376bfc [wallet] [moveonly] Move LoadKeyPool to cpp (Matt Corallo)
cab8557 [wallet] [moveonly] Move CAffectedKeysVisitor (Jonas Schnelli)
Pull request description:
This PR contains the first part of #10882 :
- if a key from the keypool is used, mark all keys up to that key as used, and then try to top up the keypool
- top up the keypool on startup
Notably, it does not stop the node or prevent the best block from advancing if the keypool drops below a threshold (which means that transactions may be missed and funds lost if restoring from an old HD wallet backup).
Tree-SHA512: ac681fefeaf7ec2aab2fa1da93d12273ea80bd05eb48d7b3b551ea6e5d975dd97ba7de52b7fba52993823280ac4079cc36cf78a27dac708107ebf8fb6326142b
4ccc12a54 [qa] Rewrite BIP66 functional tests (Suhas Daftuar)
d4f0d87b6 [qa] Rewrite BIP65 functional tests (Suhas Daftuar)
Pull request description:
After 122786d0e0, BIP65 and BIP66 activate at
particular fixed heights (without regard to version numbers of blocks
below those heights). Rewrite the functional tests to take
this into account, and remove two tests that weren't really testing anything.
Moves the rewritten functional tests out of the extended test suite, so that they run in travis regularly.
Note: I discovered that the ComparisonTestFramework (which the original versions of these p2p tests were written is, has a bug that caused them to not catch obvious errors, eg if you just comment out setting the script flags for these softforks in ConnectBlock, the versions of these tests in master do not fail(!) -- will separately PR a fix for the comparison test framework).
Tree-SHA512: 2108b79951f2e980854d0d14ccc0fd1810a43dd4251fd6e3b203e7f104ea55e00650bb1a60a28c2801b4249f46563a8559ac3e3cd39db220914acfed0b3b163d
This reverts commit d64ac3f4aa after further discussion.
Tree-SHA512: db1e4ff5b17bcd6fd000a3d21aa74f6b7e4c194e0663c1896a100612671910a7cdadd896b59642420ea016598895b54a8468914847ebefef105a3c47c311d4b2
d64ac3f [tests] Allow tests to pass when stderr is non-empty (Jonas Schnelli)
Pull request description:
Resurrect #10241 with nits addressed
Not sure how much people want this. Would be useful for functional tests which cause bitcoind to print to stderr.
Tree-SHA512: 28caccf7818fb3ed5a38caef7f77161b1678aa9b8fd12c2d1e76032f409f0d33c40f7ac91e0c8d908df4a44fd01cf97d657a08bae50c6ff17d07f5b2e20c3a6e
11ba8e9 [tests] rename getblocktemplate_proposals.py to mining.py (John Newbery)
b29dd41 [tests] add test for submit block (John Newbery)
9bf0d80 [tests] run successful test in getblocktemplate first (John Newbery)
82dc597 [tests] don't build blocks manually in getblocktemplate test (John Newbery)
f82c709 [tests] clarify assertions in getblocktemplate test (John Newbery)
66c570a [tests] Don't build the coinbase manually in getblocktemplate test (John Newbery)
38b38cd [tests] getblocktemplate_proposals.py: add logging (John Newbery)
0a3a5ff [tests] Fix flake8 warnings in getblocktemplate tests (John Newbery)
32cffe6 [tests] Fix import order in getblocktemplate test (John Newbery)
Tree-SHA512: a51a57314fa1c4c4b8a7896492ec6e677b6bed12387060def34a62e9dfbee7961f71bb5553fbd70028be61ae32eccf13fd255fa9651f908e9a5e64c28f43f00e
Rewrite the BIP66 functional tests to reflect height-based activation,
and move it out of the extended test suite.
Remove the unnecessary bipdersig.py test
After 122786d0e0, BIP65 activates at
a particular height (without regard to version numbers of blocks
below that height). Rewrite the BIP65 functional tests to take
this into account, and add a test case that exercises
OP_CHECKLOCKTIMEVERIFY in a block where the soft-fork is active.
Also moves the bip65 functional test out of the extended test suite.
176c021 [qa] Test non-atomic chainstate writes (Suhas Daftuar)
d6af06d Dont create pcoinsTip until after ReplayBlocks. (Matt Corallo)
eaca1b7 Random db flush crash simulator (Pieter Wuille)
0580ee0 Adapt memory usage estimation for flushing (Pieter Wuille)
013a56a Non-atomic flushing using the blockchain as replay journal (Pieter Wuille)
b3a279c [MOVEONLY] Move LastCommonAncestor to chain (Pieter Wuille)
Tree-SHA512: 47ccc62303f9075c44d2a914be75bd6969ff881a857a2ff1227f05ec7def6f4c71c46680c5a28cb150c814999526797dc05cf2701fde1369c06169f46eccddee
Adds new functional test, dbcrash.py, which uses -dbcrashratio to exercise the
logic for recovering from a crash during chainstate flush.
dbcrash.py is added to the extended tests, as it may take ~10 minutes to run
Use _Exit() instead of exit() for crash simulation
This eliminates stderr output such as:
terminate called without an active exception
or
Assertion failed: (!pthread_mutex_destroy(&m)), function ~recursive_mutex, file /usr/local/include/boost/thread/pthread/recursive_mutex.hpp, line 104.
Eliminating the stderr output on crash simulation allows testing with
test_runner.py, which reports a test as failed if stderr is produced.
0a4912e [tests] timeout integration tests on travis after 20 minutes (John Newbery)
7c51e9f [tests] destroy zmq context in zmq_tests.py (John Newbery)
b1bac1c [tests] in zmq test, timeout if message not received (John Newbery)
5ebd5f9 [tests] tidy up zmq_test.py (John Newbery)
4a0c08f [tests] update zmq test to use correct config.ini file (John Newbery)
Tree-SHA512: 5e607af2f2dc5c73fba4b2d3890097580a7525f6a4996c7c78f01822e45e0054fd0a225ea53fce6308804e560cced6de6cf5d16137469dcf100b2e9643e08d03
8ad5bde Merge bctest.py into bitcoin-util-test.py (John Newbery)
95836c5 Use shared config file for functional and util tests (John Newbery)
89fcd35 Use an .ini config file for environment vars in bitcoin-util-test.py (John Newbery)
e9265df Change help_text in bitcoin-util-test.py to a docstring. (John Newbery)
ce58e93 Change bitcoin-util-test.py to use Python3 (John Newbery)
Tree-SHA512: 66dab0b4a8546aee0dfaef134a165f1447aff4c0ec335754bbc7d9e55909721c62f09cdbf4b22d02ac1fcd5a9b66780f91e1cc4d8687fae7288cc9072a23a78f
The functional tests and util tests both require a config file that is
generated by ./configure. This commit merges those two config
files into a single configuration file that can be shared by both tests.
The config from config.ini is put into a Namespace object to maintain
the interface with bctest.py. A future commit could change this
interface to use a dictionary instead of a namespace.
a750d77 Add tests for mempool persistence (John Newbery)
91c91e1 Control mempool persistence using a command line parameter. (John Newbery)
Tree-SHA512: 157d01cefd1903b8bfc5cbab42a3cc5e9c1094179bf4b64b3d34c0d4d9b976d593755bfea5c41c631cb758e1de17c6c2058c130d487d20560b7c0bafcddfa520
6803e09 Move zmq test skipping logic into individual test case. (John Newbery)
Tree-SHA512: 9d166b53e9acf386c4dafc860b38e2901b331a7505bba9714a2f4e3bdef68b0316c8b76fddbfb620835ddee549cf32fffb3a96a19b0799ad94f2553f55f19a35
This commit uses the new skip test funcationality added in
232b6665bc to skip the zmq tests if the
python zmq module is not available or if bitcoind has been built without
zmq support.
This removes the zmq-specific logic from test_runner.py. In general it's
better if test_runner.py has no knowledge of special cases for
individual tests and is a general purpose test runner.
637706d Tests: Put Extended tests first when they're included (Jimmy Song)
Tree-SHA512: 0a720b2443b3e65f4ad548ecdf822468460fc4f4ecf32385dd79511a01c9ea4c94f0bf765ca593705b19baee1bae254dfcc3952da64b9c51d75b7da7abcdcd28
maxblocksinflight tested that a node would not send get_data messages
for more than 16 new blocks at the same time. bitcoin core no longer
responds to block invs with get_data, since it does headers-first
sync'ing. This test was therefore testing nothing and can be removed.
the sendheaders test script tests that bitcoin will not send get_headers
for more than 16 blocks simultaneously.
29d6634 Check that all test scripts in test/functional are being run (John Newbery)
Tree-SHA512: 9231d3a119632be031c51c4f7e95a8adae58489a8ec36fc967d499c0708bae2941a3bf28f11dcd4efd59141eb54c3c920f2629f5cd8a0139d30397a19591666d
rpt-tests.py outputs progress information as it runs tests. This commit
adds a --quiet option that suppresses that progress output and only
prints a summary of results (and logs from failed tests).
b1f584d fix build if spaces in src dir path (Matthew Zipkin)
Tree-SHA512: 5834690c1f63b85ed04bb8ed411a94da04738534364d58bd9ee333ccff7129b2bbb710f31598c40123199e023da02c1745514294af3efdbb2c2e4c1320aded35
assumevalid was merged as part of PR 9484, but was not added to the
test_runner, so is not run even as part of the extended tests.
This commit adds assumevalid to the list of tests in test_runner. It
also clarifies the code in assumevalid considerably.
Currently, functional test cases can either pass or fail. There are
occasions when it is helpful to skip tests, for example if the
system they are running on does not meet the requirements for the test.
The rest of the test suite can run without being marked as a failure.
This commit adds framework for tests to skip if their requirements
aren't met.
