Mercurial > hg
view tests/test-exchange-obsmarkers-case-B4.t @ 33807:b70029f355a3
tests: verify that peer instances only expose interface members
Our abstract interfaces are more useful if we guarantee that
implementations conform to certain rules. Namely, we want to ensure
that objects implementing interfaces don't expose new public
attributes that aren't part of the interface. That way, as long as
consumers don't access "internal" attributes (those beginning with
"_") then (in theory) objects implementing interfaces can be swapped
out and everything will "just work."
We add a test that enforces our "no public attributes not part
of the abstract interface" rule.
We /could/ implement "interface compliance detection" at run-time.
However, that is littered with problems.
The obvious solutions are custom __new__ and __init__ methods.
These rely on derived types actually calling the parent's
implementation, which is no sure bet. Furthermore, __new__ and
__init__ will likely be called before instance-specific attributes
are assigned. In other words, they won't detect public attributes
set on self.__dict__. This means public attribute detection won't
be robust.
We could work around lack of robust self.__dict__ public attribute
detection by having our interfaces implement a custom __getattribute__,
__getattr__, and/or __setattr__. However, this incurs an undesirable
run-time penalty. And, subclasses could override our custom
method, bypassing the check.
The most robust solution is a non-runtime test. So that's what this
commit implements. We have a generic function for validating that an
object only has public attributes defined by abstract classes. Then,
we instantiate some peers and verify a newly constructed object
plays by the rules.
Differential Revision: https://phab.mercurial-scm.org/D339
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Thu, 10 Aug 2017 21:00:30 -0700 |
parents | 4a4fa665e1b4 |
children |
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============================================ Testing obsolescence markers push: Cases B.4 ============================================ Mercurial pushes obsolescences markers relevant to the "pushed-set", the set of all changesets that requested to be "in sync" after the push (even if they are already on both side). This test belongs to a series of tests checking such set is properly computed and applied. This does not tests "obsmarkers" discovery capabilities. Category B: pruning case TestCase 4: Pruned changeset on common part of the history Variants: # a: explicite push # b: bare push B.4 Pruned changeset on common part of history ============================================= .. {{{ .. ⊗ C .. | ● B .. | | .. | ● A .. |/ .. ● O .. }}} .. .. Marker exist from: .. .. * C (prune) .. .. Command run: .. .. * hg push -r B .. * hg push .. .. Expected exchange: .. .. * prune for C Setup ----- $ . $TESTDIR/testlib/exchange-obsmarker-util.sh initial $ setuprepos B.4 creating test repo for test case B.4 - pulldest - main - pushdest cd into `main` and proceed with env setup $ cd main $ mkcommit A $ mkcommit B $ hg phase --public . $ hg push ../pushdest pushing to ../pushdest searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 2 changesets with 2 changes to 2 files $ hg push ../pulldest pushing to ../pulldest searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 2 changesets with 2 changes to 2 files $ hg update -q 0 $ mkcommit C created new head $ hg prune -qd '0 0' . $ hg log -G --hidden x 7f7f229b13a6 (draft): C | | o f6fbb35d8ac9 (public): B | | | o f5bc6836db60 (public): A |/ @ a9bdc8b26820 (public): O $ inspect_obsmarkers obsstore content ================ 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} $ cd .. $ cd .. $ cp -R B.4 B.4.a $ cp -R B.4 B.4.b Actual Test (explicit push version) ----------------------------------- $ dotest B.4.a O ## Running testcase B.4.a # testing echange of "O" (a9bdc8b26820) ## initial state # obstore: main 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pushdest # obstore: pulldest ## pushing "O" from main to pushdest pushing to pushdest searching for changes no changes found remote: 1 new obsolescence markers ## post push state # obstore: main 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pushdest 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pulldest ## pulling "a9bdc8b26820" from main into pulldest pulling from main no changes found 1 new obsolescence markers ## post pull state # obstore: main 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pushdest 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pulldest 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} Actual Test (bare push version) ----------------------------------- $ dotest B.4.b ## Running testcase B.4.b ## initial state # obstore: main 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pushdest # obstore: pulldest ## pushing from main to pushdest pushing to pushdest searching for changes no changes found remote: 1 new obsolescence markers ## post push state # obstore: main 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pushdest 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pulldest ## pulling from main into pulldest pulling from main searching for changes no changes found 1 new obsolescence markers ## post pull state # obstore: main 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pushdest 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'} # obstore: pulldest 7f7f229b13a629a5b20581c6cb723f4e2ca54bed 0 {a9bdc8b26820b1b87d585b82eb0ceb4a2ecdbc04} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}