Patchwork [4,of,5,V9] testing: allow Hypothesis to enable extensions

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Submitter David MacIver
Date Feb. 26, 2016, 11:38 a.m.
Message ID <a4034609a1cc665deac0.1456486719@laser-shark>
Download mbox | patch
Permalink /patch/13408/
State Accepted
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David MacIver - Feb. 26, 2016, 11:38 a.m.
# HG changeset patch
# User David R. MacIver <david@drmaciver.com>
# Date 1456319490 0
#      Wed Feb 24 13:11:30 2016 +0000
# Node ID a4034609a1cc665deac01aa7dc56a8da8a6b4397
# Parent  4a16f5120bdce0bd2efdef6ce3b6aa3d7c48673a
testing: allow Hypothesis to enable extensions

This adds support for testing extensions, including both tests
that extensions don't change behaviour and test for specific
commands.

We use the precondition system to determine what commands are
available to us. If we never use any commands enabled by an
extension then that extension is *skippable* and should not
have changed the behaviour of the test. We thus rerun the test
with an environment variable which is designed to turn off the
extension.

Patch

diff -r 4a16f5120bdc -r a4034609a1cc tests/test-verify-repo-operations.py
--- a/tests/test-verify-repo-operations.py	Wed Feb 24 18:36:49 2016 +0000
+++ b/tests/test-verify-repo-operations.py	Wed Feb 24 13:11:30 2016 +0000
@@ -37,7 +37,8 @@ 
 import subprocess
 
 from hypothesis.errors import HypothesisException
-from hypothesis.stateful import rule, RuleBasedStateMachine, Bundle
+from hypothesis.stateful import (
+    rule, RuleBasedStateMachine, Bundle, precondition)
 from hypothesis import settings, note, strategies as st
 from hypothesis.configuration import set_hypothesis_home_dir
 
@@ -155,6 +156,9 @@ 
         self.mkdirp("repo1")
         self.cd("repo1")
         self.hg("init")
+        self.extensions = {}
+        self.all_extensions = set()
+        self.non_skippable_extensions = set()
 
     def teardown(self):
         """On teardown we clean up after ourselves as usual, but we also
@@ -185,6 +189,17 @@ 
         e = None
         if not self.failed:
             try:
+                for ext in (
+                    self.all_extensions - self.non_skippable_extensions
+                ):
+                    try:
+                        os.environ["SKIP_EXTENSION"] = ext
+                        output = subprocess.check_output([
+                            runtests, path, "--local",
+                        ], stderr=subprocess.STDOUT)
+                        assert "Ran 1 test" in output, output
+                    finally:
+                        del os.environ["SKIP_EXTENSION"]
                 output = subprocess.check_output([
                     runtests, path, "--local", "--pure"
                 ], stderr=subprocess.STDOUT)
@@ -468,6 +483,50 @@ 
             else:
                 self.hg("update", "--", branch)
 
+    # Section: Extension management
+    def hasextension(self, extension):
+        repo = self.currentrepo
+        return repo in self.extensions and extension in self.extensions[repo]
+
+    def commandused(self, extension):
+        assert extension in self.all_extensions
+        self.non_skippable_extensions.add(extension)
+
+    @rule(extension=st.sampled_from((
+        'shelve', 'mq', 'blackbox',
+    )))
+    def addextension(self, extension):
+        self.all_extensions.add(extension)
+        extensions = self.extensions.setdefault(self.currentrepo, set())
+        if extension in extensions:
+            return
+        extensions.add(extension)
+        if not os.path.exists(hgrc):
+            self.command("touch", hgrc)
+        with open(hgrc, 'a') as o:
+            line = "[extensions]\n%s=\n" % (extension,)
+            o.write(line)
+        for l in line.splitlines():
+            self.log.append((
+                '$ if test "$SKIP_EXTENSION" != "%s" ; '
+                'then echo %r >> %s; fi') % (
+                    extension, l, hgrc,))
+
+    # Section: Commands from the shelve extension
+    @rule()
+    @precondition(lambda self: self.hasextension("shelve"))
+    def shelve(self):
+        self.commandused("shelve")
+        with acceptableerrors("nothing changed"):
+            self.hg("shelve")
+
+    @rule()
+    @precondition(lambda self: self.hasextension("shelve"))
+    def unshelve(self):
+        self.commandused("shelve")
+        with acceptableerrors("no shelved changes to apply"):
+            self.hg("unshelve")
+
 settings.register_profile(
     'default',  settings(
         timeout=300,