[pypy-commit] pypy fix-vmprof-stacklet-switch-2: WIP: introduce a pytest fixture which allow us to easily use a global FakeVMProf instead of the real one

[antocuni]

Author: Antonio Cuni <anto.c...@gmail.com>
Branch: fix-vmprof-stacklet-switch-2
Changeset: r93192:d5d42f493530
Date: 2017-11-28 15:47 +0100
http://bitbucket.org/pypy/pypy/changeset/d5d42f493530/

Log:    WIP: introduce a pytest fixture which allow us to easily use a
        global FakeVMProf instead of the real one

diff --git a/rpython/rlib/rvmprof/test/support.py 
b/rpython/rlib/rvmprof/test/support.py
--- a/rpython/rlib/rvmprof/test/support.py
+++ b/rpython/rlib/rvmprof/test/support.py
@@ -1,3 +1,5 @@
+import pytest
+from rpython.rlib import rvmprof
 
 class FakeVMProf(object):
 
@@ -24,3 +26,12 @@
     def is_sampling_enabled(self):
         return self._ignore_signals == 0
 
+
+@pytest.fixture
+def fakevmprof(request, monkeypatch):
+    fake = FakeVMProf()
+    def _get_fake_vmprof():
+        return fake
+    monkeypatch.setattr(rvmprof.rvmprof, '_get_vmprof', _get_fake_vmprof)
+    return fake
+
diff --git a/rpython/rlib/rvmprof/test/test_support.py 
b/rpython/rlib/rvmprof/test/test_support.py
--- a/rpython/rlib/rvmprof/test/test_support.py
+++ b/rpython/rlib/rvmprof/test/test_support.py
@@ -1,5 +1,6 @@
 import pytest
-from rpython.rlib.rvmprof.test.support import FakeVMProf
+from rpython.rlib import rvmprof
+from rpython.rlib.rvmprof.test.support import FakeVMProf, fakevmprof
 
 class TestFakeVMProf(object):
 
@@ -21,3 +22,17 @@
         #
         pytest.raises(AssertionError, "fake.start_sampling()")
     
+
+
+class TestFixture(object):
+
+    def test_fixture(self, fakevmprof):
+        assert isinstance(fakevmprof, FakeVMProf)
+        assert rvmprof.rvmprof._get_vmprof() is fakevmprof
+        #
+        # tweak sampling using the "real" API, and check that we actually used
+        # the fake
+        rvmprof.start_sampling()
+        assert fakevmprof.is_sampling_enabled
+        rvmprof.stop_sampling()
+        assert not fakevmprof.is_sampling_enabled
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