run doctests in .txt/.rst files directly specified on command line irrespective of "test*.txt" pattern.

_pytest/doctest.py

@@ -19,7 +19,8 @@ def pytest_collect_file(path, parent):
     if path.ext == ".py":
         if config.option.doctestmodules:
             return DoctestModule(path, parent)
-    elif path.check(fnmatch=config.getvalue("doctestglob")):
+    elif (path.ext in ('.txt', '.rst') and parent.session.isinitpath(path)) or \
+        path.check(fnmatch=config.getvalue("doctestglob")):
         return DoctestTextfile(path, parent)
 
 class ReprFailDoctest(TerminalRepr):

doc/index.txt

@@ -5,7 +5,7 @@ py.test: no-boilerplate testing with Python
 
 .. note::
     version 2.0 introduces ``pytest`` as the main Python import name
-    but for compatibility reasons you may continue to use ``py.test``
+    but for compatibility reasons you can continue to use ``py.test``
     in your test code.
 
 Welcome to ``py.test`` documentation:

testing/test_doctest.py

@@ -1,12 +1,10 @@
 from _pytest.doctest import DoctestModule, DoctestTextfile
 import py
 
-pytest_plugins = ["pytest_doctest"]
-
 class TestDoctests:
 
     def test_collect_testtextfile(self, testdir):
-        testdir.maketxtfile(whatever="")
+        w = testdir.maketxtfile(whatever="")
         checkfile = testdir.maketxtfile(test_something="""
             alskdjalsdk
             >>> i = 5
@@ -18,6 +16,8 @@ class TestDoctests:
             items, reprec = testdir.inline_genitems(x)
             assert len(items) == 1
             assert isinstance(items[0], DoctestTextfile)
+        items, reprec = testdir.inline_genitems(w)
+        assert len(items) == 1
 
     def test_collect_module(self, testdir):
         path = testdir.makepyfile(whatever="#")

tox.ini

@@ -57,6 +57,6 @@ commands=
 [pytest]
 minversion=2.0
 plugins=pytester
-#addopts= -rxf --pyargs
+addopts= -rxf --pyargs
 rsyncdirs=tox.ini pytest.py _pytest testing