Add support for PEP302 get_data API

Fix #808

CHANGELOG

@@ -1,6 +1,11 @@
 2.8.0.dev (compared to 2.7.X)
 -----------------------------
 
+- fix issue 808: pytest's internal assertion rewrite hook now implements the
+  optional PEP302 get_data API so tests can access data files next to them.
+  Thanks xmo-odoo for request and example and Bruno Oliveira for
+  the PR.
+
 - rootdir and inifile are now displayed during usage errors to help
   users diagnose problems such as unexpected ini files which add
   unknown options being picked up by pytest. Thanks to Pavel Savchenko for

_pytest/assertion/rewrite.py

@@ -197,6 +197,12 @@ class AssertionRewritingHook(object):
         #  DefaultProvider is appropriate.
         pkg_resources.register_loader_type(cls, pkg_resources.DefaultProvider)
 
+    def get_data(self, pathname):
+        """Optional PEP302 get_data API.
+        """
+        with open(pathname, 'rb') as f:
+            return f.read()
+
 
 def _write_pyc(state, co, source_stat, pyc):
     # Technically, we don't have to have the same pyc format as

testing/test_assertrewrite.py

@@ -664,6 +664,21 @@ class TestAssertionRewriteHookDetails(object):
             "* 1 passed*",
         ])
 
+    def test_get_data_support(self, testdir):
+        """Implement optional PEP302 api (#808).
+        """
+        path = testdir.mkpydir("foo")
+        path.join("test_foo.py").write(py.code.Source("""
+            class Test:
+                def test_foo(self):
+                    import pkgutil
+                    data = pkgutil.get_data('foo.test_foo', 'data.txt')
+                    assert data == b'Hey'
+        """))
+        path.join('data.txt').write('Hey')
+        result = testdir.runpytest()
+        result.stdout.fnmatch_lines('*1 passed*')
+
 
 def test_issue731(testdir):
     testdir.makepyfile("""