[svn r62211] merge 60797:HEAD of pytestplugin branch:

this merge contains:

* a new plugin architecture
* a pluginized pytest core
* many pytest related refactorings
* refactorings/streamlining of pytest's own tests

--HG--
branch : trunk

py/test/plugin/pytest_tmpdir.py

@@ -0,0 +1,45 @@
+"""
+example:
+
+    pytest_plugins = "pytest_tmpdir" 
+
+    def test_plugin(tmpdir):
+        tmpdir.join("hello").write("hello")
+
+"""
+import py
+
+class TmpdirPlugin:
+    """ provide temporary directories to test functions and methods. 
+    """ 
+
+    def pytest_configure(self, config):
+        # XXX make ensuretemp live on config 
+        self.basetmp = py.test.ensuretemp("tmpdir")
+
+    def pytest_pyfuncarg_tmpdir(self, pyfuncitem):
+        name = pyfuncitem.name
+        for i in range(10000):
+            try:
+                tmpdir = self.basetmp.mkdir(name + (i and str(i) or ''))
+            except py.error.EEXIST:
+                continue
+            break
+        return tmpdir
+
+# ===============================================================================
+#
+# plugin tests 
+#
+# ===============================================================================
+#
+def test_generic(plugintester):
+    plugintester.apicheck(TmpdirPlugin)
+
+def test_pyfuncarg(testdir):
+    item = testdir.getitem("def test_func(tmpdir): pass")
+    plugin = TmpdirPlugin()
+    plugin.pytest_configure(item._config)
+    p = plugin.pytest_pyfuncarg_tmpdir(item)
+    assert p.check()
+    assert p.basename.endswith("test_func")