fix comment typos

_pytest/pytester.py

@@ -467,9 +467,9 @@ class TmpTestdir:
 
     def _getpybinargs(self, scriptname):
         if not self.request.config.getvalue("notoolsonpath"):
-            # XXX we rely on script refering to the correct environment
+            # XXX we rely on script referring to the correct environment
             # we cannot use "(py.std.sys.executable,script)"
-            # becaue on windows the script is e.g. a py.test.exe
+            # because on windows the script is e.g. a py.test.exe
             return (py.std.sys.executable, _pytest_fullpath,) # noqa
         else:
             pytest.skip("cannot run %r with --no-tools-on-path" % scriptname)

_pytest/python.py

@@ -485,7 +485,7 @@ class Module(pytest.File, PyCollector):
             fin = getattr(self.obj, 'teardown_module', None)
         if fin is not None:
             #XXX: nose compat hack, move to nose plugin
-            # if it takes a positional arg, its probably a pytest style one
+            # if it takes a positional arg, it's probably a pytest style one
             # so we pass the current module object
             if inspect.getargspec(fin)[0]:
                 finalizer = lambda: fin(self.obj)

testing/test_config.py

@@ -16,7 +16,7 @@ class TestParseIni:
         assert config.inicfg['name'] == 'value'
 
     def test_getcfg_empty_path(self, tmpdir):
-        getcfg([''], ['setup.cfg']) #happens on py.test  ""
+        getcfg([''], ['setup.cfg']) #happens on py.test ""
 
     def test_append_parse_args(self, testdir, tmpdir):
         tmpdir.join("setup.cfg").write(py.code.Source("""