diff --git a/testing/python/collect.py b/testing/python/collect.py
index 2fbdf76f7..15b7c2db3 100644
--- a/testing/python/collect.py
+++ b/testing/python/collect.py
@@ -15,7 +15,7 @@ class TestModule:
         p.pyimport()
         del py.std.sys.modules['test_whatever']
         b.ensure("test_whatever.py")
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*import*mismatch*",
             "*imported*test_whatever*",
@@ -59,7 +59,7 @@ class TestClass:
                 def __init__(self):
                     pass
         """)
-        result = testdir.runpytest_inprocess("-rw")
+        result = testdir.runpytest("-rw")
         result.stdout.fnmatch_lines_random("""
             WC1*test_class_with_init_warning.py*__init__*
         """)
@@ -69,7 +69,7 @@ class TestClass:
             class test(object):
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*collected 0*",
         ])
@@ -86,7 +86,7 @@ class TestClass:
                 def teardown_class(cls):
                     pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*1 passed*",
         ])
@@ -534,7 +534,7 @@ class TestConftestCustomization:
         """)
         testdir.makepyfile("def test_some(): pass")
         testdir.makepyfile(test_xyz="def test_func(): pass")
-        result = testdir.runpytest_inprocess("--collect-only")
+        result = testdir.runpytest("--collect-only")
         result.stdout.fnmatch_lines([
             "*<Module*test_pytest*",
             "*<MyModule*xyz*",
@@ -590,7 +590,7 @@ class TestConftestCustomization:
                     return MyFunction(name, collector)
         """)
         testdir.makepyfile("def some(): pass")
-        result = testdir.runpytest_inprocess("--collect-only")
+        result = testdir.runpytest("--collect-only")
         result.stdout.fnmatch_lines([
             "*MyFunction*some*",
         ])
@@ -648,7 +648,7 @@ class TestTracebackCutting:
                 raise ValueError("xyz")
         """)
         p = testdir.makepyfile("def test(hello): pass")
-        result = testdir.runpytest_inprocess(p)
+        result = testdir.runpytest(p)
         assert result.ret != 0
         out = result.stdout.str()
         assert out.find("xyz") != -1
@@ -656,7 +656,7 @@ class TestTracebackCutting:
         numentries = out.count("_ _ _") # separator for traceback entries
         assert numentries == 0
 
-        result = testdir.runpytest_inprocess("--fulltrace", p)
+        result = testdir.runpytest("--fulltrace", p)
         out = result.stdout.str()
         assert out.find("conftest.py:2: ValueError") != -1
         numentries = out.count("_ _ _ _") # separator for traceback entries
@@ -669,7 +669,7 @@ class TestTracebackCutting:
             x = 17
             asd
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret != 0
         out = result.stdout.str()
         assert "x = 1" not in out
@@ -678,7 +678,7 @@ class TestTracebackCutting:
             " *asd*",
             "E*NameError*",
         ])
-        result = testdir.runpytest_inprocess("--fulltrace")
+        result = testdir.runpytest("--fulltrace")
         out = result.stdout.str()
         assert "x = 1" in out
         assert "x = 2" in out
@@ -769,7 +769,7 @@ def test_customized_python_discovery(testdir):
     """)
     p2 = p.new(basename=p.basename.replace("test", "check"))
     p.move(p2)
-    result = testdir.runpytest_inprocess("--collect-only", "-s")
+    result = testdir.runpytest("--collect-only", "-s")
     result.stdout.fnmatch_lines([
         "*check_customized*",
         "*check_simple*",
@@ -777,7 +777,7 @@ def test_customized_python_discovery(testdir):
         "*check_meth*",
     ])
 
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     assert result.ret == 0
     result.stdout.fnmatch_lines([
         "*2 passed*",
@@ -793,12 +793,12 @@ def test_customized_python_discovery_functions(testdir):
         def _test_underscore():
             pass
     """)
-    result = testdir.runpytest_inprocess("--collect-only", "-s")
+    result = testdir.runpytest("--collect-only", "-s")
     result.stdout.fnmatch_lines([
         "*_test_underscore*",
     ])
 
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     assert result.ret == 0
     result.stdout.fnmatch_lines([
         "*1 passed*",
@@ -818,7 +818,7 @@ def test_collector_attributes(testdir):
          def test_hello():
             pass
     """)
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     result.stdout.fnmatch_lines([
         "*1 passed*",
     ])
@@ -842,7 +842,7 @@ def test_customize_through_attributes(testdir):
             def test_hello(self):
                 pass
     """)
-    result = testdir.runpytest_inprocess("--collect-only")
+    result = testdir.runpytest("--collect-only")
     result.stdout.fnmatch_lines([
         "*MyClass*",
         "*MyInstance*",
@@ -862,6 +862,6 @@ def test_unorderable_types(testdir):
             return Test
         TestFoo = make_test()
     """)
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     assert "TypeError" not in result.stdout.str()
     assert result.ret == 0
diff --git a/testing/python/fixture.py b/testing/python/fixture.py
index 549864285..679caa927 100644
--- a/testing/python/fixture.py
+++ b/testing/python/fixture.py
@@ -33,7 +33,7 @@ class TestFillFixtures:
             def test_func(some):
                 pass
         """)
-        result = testdir.runpytest_inprocess() # "--collect-only")
+        result = testdir.runpytest() # "--collect-only")
         assert result.ret != 0
         result.stdout.fnmatch_lines([
             "*def test_func(some)*",
@@ -78,7 +78,7 @@ class TestFillFixtures:
                 def test_method(self, something):
                     assert something is self
         """)
-        result = testdir.runpytest_inprocess(p)
+        result = testdir.runpytest(p)
         result.stdout.fnmatch_lines([
             "*1 passed*"
         ])
@@ -119,9 +119,9 @@ class TestFillFixtures:
                  def test_spam(self, spam):
                      assert spam == 'spamspam'
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*1 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*1 passed*"])
 
     def test_extend_fixture_conftest_module(self, testdir):
@@ -142,9 +142,9 @@ class TestFillFixtures:
             def test_spam(spam):
                 assert spam == 'spamspam'
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*1 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*1 passed*"])
 
     def test_extend_fixture_conftest_conftest(self, testdir):
@@ -168,9 +168,9 @@ class TestFillFixtures:
             def test_spam(spam):
                 assert spam == "spamspam"
         """))
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*1 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*1 passed*"])
 
     def test_extend_fixture_conftest_plugin(self, testdir):
@@ -195,7 +195,7 @@ class TestFillFixtures:
             def test_foo(foo):
                 assert foo == 14
         """)
-        result = testdir.runpytest_inprocess('-s')
+        result = testdir.runpytest('-s')
         assert result.ret == 0
 
     def test_extend_fixture_plugin_plugin(self, testdir):
@@ -221,7 +221,7 @@ class TestFillFixtures:
             def test_foo(foo):
                 assert foo == 14
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret == 0
 
     def test_override_parametrized_fixture_conftest_module(self, testdir):
@@ -243,9 +243,9 @@ class TestFillFixtures:
             def test_spam(spam):
                 assert spam == 'spam'
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*1 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*1 passed*"])
 
     def test_override_parametrized_fixture_conftest_conftest(self, testdir):
@@ -270,9 +270,9 @@ class TestFillFixtures:
             def test_spam(spam):
                 assert spam == "spam"
         """))
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*1 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*1 passed*"])
 
     def test_override_non_parametrized_fixture_conftest_module(self, testdir):
@@ -297,9 +297,9 @@ class TestFillFixtures:
                 assert spam == params['spam']
                 params['spam'] += 1
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*3 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*3 passed*"])
 
     def test_override_non_parametrized_fixture_conftest_conftest(self, testdir):
@@ -327,9 +327,9 @@ class TestFillFixtures:
                 assert spam == params['spam']
                 params['spam'] += 1
         """))
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines(["*3 passed*"])
-        result = testdir.runpytest_inprocess(testfile)
+        result = testdir.runpytest(testfile)
         result.stdout.fnmatch_lines(["*3 passed*"])
 
     def test_autouse_fixture_plugin(self, testdir):
@@ -349,7 +349,7 @@ class TestFillFixtures:
             def test_foo(request):
                 assert request.function.foo == 7
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret == 0
 
     def test_funcarg_lookup_error(self, testdir):
@@ -357,7 +357,7 @@ class TestFillFixtures:
             def test_lookup_error(unknown):
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*ERROR*test_lookup_error*",
             "*def test_lookup_error(unknown):*",
@@ -386,7 +386,7 @@ class TestFillFixtures:
                     traceback.print_exc()
                 assert sys.exc_info() == (None, None, None)
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret == 0
 
 
@@ -529,7 +529,7 @@ class TestRequestBasic:
             def test_second():
                 assert len(l) == 1
         """)
-        result = testdir.runpytest_inprocess(p)
+        result = testdir.runpytest(p)
         result.stdout.fnmatch_lines([
             "*1 error*"  # XXX the whole module collection fails
             ])
@@ -614,7 +614,7 @@ class TestRequestBasic:
         """))
         p = b.join("test_module.py")
         p.write("def test_func(arg1): pass")
-        result = testdir.runpytest_inprocess(p, "--fixtures")
+        result = testdir.runpytest(p, "--fixtures")
         assert result.ret == 0
         result.stdout.fnmatch_lines("""
             *fixtures defined*conftest*
@@ -783,7 +783,7 @@ class TestRequestCachedSetup:
             def test_two_different_setups(arg1, arg2):
                 assert arg1 != arg2
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines([
             "*1 passed*"
         ])
@@ -798,7 +798,7 @@ class TestRequestCachedSetup:
             def test_two_funcarg(arg1):
                 assert arg1 == 11
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines([
             "*1 passed*"
         ])
@@ -825,7 +825,7 @@ class TestRequestCachedSetup:
             def test_check_test0_has_teardown_correct():
                 assert test_0.l == [2]
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines([
             "*3 passed*"
         ])
@@ -841,7 +841,7 @@ class TestRequestCachedSetup:
             def test_func(app):
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret != 0
         result.stdout.fnmatch_lines([
             "*3/x*",
@@ -896,7 +896,7 @@ class TestFixtureUsages:
             def test_add(arg2):
                 assert arg2 == 2
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*ScopeMismatch*involved factories*",
             "* def arg2*",
@@ -918,7 +918,7 @@ class TestFixtureUsages:
             def test_add(arg1, arg2):
                 assert arg2 == 2
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*ScopeMismatch*involved factories*",
             "* def arg2*",
@@ -942,7 +942,7 @@ class TestFixtureUsages:
                 assert arg2 == arg1 + 1
                 assert len(l) == arg1
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*2 passed*"
         ])
@@ -962,7 +962,7 @@ class TestFixtureUsages:
             def test_missing(call_fail):
                 pass
             """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines("""
             *pytest.fixture()*
             *def call_fail(fail)*
@@ -1044,7 +1044,7 @@ class TestFixtureUsages:
         reprec.assertoutcome(passed=2)
 
     def test_usefixtures_seen_in_showmarkers(self, testdir):
-        result = testdir.runpytest_inprocess("--markers")
+        result = testdir.runpytest("--markers")
         result.stdout.fnmatch_lines("""
             *usefixtures(fixturename1*mark tests*fixtures*
         """)
@@ -1311,7 +1311,7 @@ class TestAutouseDiscovery:
         conftest.move(a.join(conftest.basename))
         a.join("test_something.py").write("def test_func(): pass")
         b.join("test_otherthing.py").write("def test_func(): pass")
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines("""
             *1 passed*1 error*
         """)
@@ -1765,7 +1765,7 @@ class TestFixtureMarker:
                 def test_1(arg):
                     pass
             """ % method)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret != 0
         result.stdout.fnmatch_lines([
             "*ScopeMismatch*You tried*function*session*request*",
@@ -1823,7 +1823,7 @@ class TestFixtureMarker:
             def test_mismatch(arg):
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*ScopeMismatch*",
             "*1 error*",
@@ -1874,7 +1874,7 @@ class TestFixtureMarker:
             def test_func4(marg):
                 pass
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines("""
             test_mod1.py::test_func[s1] PASSED
             test_mod2.py::test_func2[s1] PASSED
@@ -1926,7 +1926,7 @@ class TestFixtureMarker:
                 def test_3(self):
                     pass
         """)
-        result = testdir.runpytest_inprocess("-vs")
+        result = testdir.runpytest("-vs")
         result.stdout.fnmatch_lines("""
             test_class_ordering.py::TestClass2::test_1[1-a] PASSED
             test_class_ordering.py::TestClass2::test_1[2-a] PASSED
@@ -2017,7 +2017,7 @@ class TestFixtureMarker:
             def test_finish():
                 assert not l
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines("""
             *3 passed*
         """)
@@ -2047,7 +2047,7 @@ class TestFixtureMarker:
             def test_browser(browser):
                 assert browser['visited'] is True
         """))
-        reprec = testdir.runpytest_inprocess("-s")
+        reprec = testdir.runpytest("-s")
         for test in ['test_browser']:
             reprec.stdout.fnmatch_lines('*Finalized*')
 
@@ -2258,7 +2258,7 @@ class TestFixtureMarker:
             def test_foo(fix):
                 assert 1
         """)
-        res = testdir.runpytest_inprocess('-v')
+        res = testdir.runpytest('-v')
         res.stdout.fnmatch_lines([
             '*test_foo*alpha*',
             '*test_foo*beta*'])
@@ -2275,7 +2275,7 @@ class TestFixtureMarker:
             def test_foo(fix):
                 assert 1
         """)
-        res = testdir.runpytest_inprocess('-v')
+        res = testdir.runpytest('-v')
         res.stdout.fnmatch_lines([
             '*test_foo*alpha*',
             '*test_foo*beta*'])
@@ -2335,7 +2335,7 @@ class TestErrors:
             def test_something(gen):
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret != 0
         result.stdout.fnmatch_lines([
             "*def gen(qwe123):*",
@@ -2361,7 +2361,7 @@ class TestErrors:
             def test_3():
                 assert l[0] != l[1]
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines("""
             *ERROR*teardown*test_1*
             *KeyError*
@@ -2381,7 +2381,7 @@ class TestErrors:
             def test_something():
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret != 0
         result.stdout.fnmatch_lines([
             "*def gen(qwe123):*",
@@ -2395,7 +2395,7 @@ class TestShowFixtures:
         assert config.option.showfixtures
 
     def test_show_fixtures(self, testdir):
-        result = testdir.runpytest_inprocess("--fixtures")
+        result = testdir.runpytest("--fixtures")
         result.stdout.fnmatch_lines([
                 "*tmpdir*",
                 "*temporary directory*",
@@ -2403,7 +2403,7 @@ class TestShowFixtures:
         )
 
     def test_show_fixtures_verbose(self, testdir):
-        result = testdir.runpytest_inprocess("--fixtures", "-v")
+        result = testdir.runpytest("--fixtures", "-v")
         result.stdout.fnmatch_lines([
                 "*tmpdir*--*tmpdir.py*",
                 "*temporary directory*",
@@ -2420,7 +2420,7 @@ class TestShowFixtures:
             def arg1():
                 """  hello world """
         ''')
-        result = testdir.runpytest_inprocess("--fixtures", p)
+        result = testdir.runpytest("--fixtures", p)
         result.stdout.fnmatch_lines("""
             *tmpdir
             *fixtures defined from*
@@ -2442,7 +2442,7 @@ class TestShowFixtures:
                 def test_hello():
                     pass
             """)
-        result = testdir.runpytest_inprocess("--fixtures")
+        result = testdir.runpytest("--fixtures")
         result.stdout.fnmatch_lines("""
             *tmpdir*
             *fixtures defined from*conftest*
@@ -2468,7 +2468,7 @@ class TestShowFixtures:
 
                 """
         ''')
-        result = testdir.runpytest_inprocess("--fixtures", p)
+        result = testdir.runpytest("--fixtures", p)
         result.stdout.fnmatch_lines("""
             * fixtures defined from test_show_fixtures_trimmed_doc *
             arg2
@@ -2496,7 +2496,7 @@ class TestContextManagerFixtureFuncs:
                 print ("test2 %s" % arg1)
                 assert 0
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *setup*
             *test1 1*
@@ -2519,7 +2519,7 @@ class TestContextManagerFixtureFuncs:
             def test_2(arg1):
                 print ("test2 %s" % arg1)
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *setup*
             *test1 1*
@@ -2537,7 +2537,7 @@ class TestContextManagerFixtureFuncs:
             def test_1(arg1):
                 pass
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *pytest.fail*setup*
             *1 error*
@@ -2553,7 +2553,7 @@ class TestContextManagerFixtureFuncs:
             def test_1(arg1):
                 pass
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *pytest.fail*teardown*
             *1 passed*1 error*
@@ -2569,7 +2569,7 @@ class TestContextManagerFixtureFuncs:
             def test_1(arg1):
                 pass
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *fixture function*
             *test_yields*:2*
@@ -2585,7 +2585,7 @@ class TestContextManagerFixtureFuncs:
             def test_1(arg1):
                 pass
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *yield_fixture*requires*yield*
             *yield_fixture*
@@ -2601,7 +2601,7 @@ class TestContextManagerFixtureFuncs:
             def test_1(arg1):
                 pass
         """)
-        result = testdir.runpytest_inprocess("-s")
+        result = testdir.runpytest("-s")
         result.stdout.fnmatch_lines("""
             *fixture*cannot use*yield*
             *def arg1*
diff --git a/testing/python/metafunc.py b/testing/python/metafunc.py
index 6f8665e1c..7a6d1eebf 100644
--- a/testing/python/metafunc.py
+++ b/testing/python/metafunc.py
@@ -246,7 +246,7 @@ class TestMetafunc:
                 assert x in (10,20)
                 assert y == 2
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines([
             "*test_simple*1-2*",
             "*test_simple*2-2*",
@@ -290,7 +290,7 @@ class TestMetafunc:
                 def test_meth(self, x, y):
                     assert 0, x
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret == 1
         result.assert_outcomes(failed=6)
 
@@ -330,7 +330,7 @@ class TestMetafunc:
                def test_3(self, arg, arg2):
                   pass
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         assert result.ret == 0
         result.stdout.fnmatch_lines("""
             *test_1*1*
@@ -372,7 +372,7 @@ class TestMetafuncFunctional:
                     assert metafunc.function == unbound
                     assert metafunc.cls == TestClass
         """)
-        result = testdir.runpytest_inprocess(p, "-v")
+        result = testdir.runpytest(p, "-v")
         result.assert_outcomes(passed=2)
 
     def test_addcall_with_two_funcargs_generators(self, testdir):
@@ -389,7 +389,7 @@ class TestMetafuncFunctional:
                 def test_myfunc(self, arg1, arg2):
                     assert arg1 == arg2
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_myfunc*0*PASS*",
             "*test_myfunc*1*FAIL*",
@@ -410,7 +410,7 @@ class TestMetafuncFunctional:
             def test_func2(arg1):
                 assert arg1 in (10, 20)
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_func1*0*PASS*",
             "*test_func1*1*FAIL*",
@@ -427,7 +427,7 @@ class TestMetafuncFunctional:
                 def test_hello(xyz):
                     pass
         """)
-        result = testdir.runpytest_inprocess(p)
+        result = testdir.runpytest(p)
         result.assert_outcomes(passed=1)
 
 
@@ -450,7 +450,7 @@ class TestMetafuncFunctional:
                 def test_myfunc(self, arg1, arg2):
                     assert arg1 == arg2
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_myfunc*hello*PASS*",
             "*test_myfunc*world*FAIL*",
@@ -466,7 +466,7 @@ class TestMetafuncFunctional:
                 def test_myfunc(self, hello):
                     assert hello == "world"
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_myfunc*hello*PASS*",
             "*1 passed*"
@@ -483,7 +483,7 @@ class TestMetafuncFunctional:
                     assert not hasattr(self, 'x')
                     self.x = 1
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_func*0*PASS*",
             "*test_func*1*PASS*",
@@ -501,7 +501,7 @@ class TestMetafuncFunctional:
                 def setup_method(self, func):
                     self.val = 1
             """)
-        result = testdir.runpytest_inprocess(p)
+        result = testdir.runpytest(p)
         result.assert_outcomes(passed=1)
 
     def test_parametrize_functional2(self, testdir):
@@ -512,7 +512,7 @@ class TestMetafuncFunctional:
             def test_hello(arg1, arg2):
                 assert 0, (arg1, arg2)
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         result.stdout.fnmatch_lines([
             "*(1, 4)*",
             "*(1, 5)*",
@@ -537,7 +537,7 @@ class TestMetafuncFunctional:
             def test_func1(arg1, arg2):
                 assert arg1 == 11
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_func1*1*PASS*",
             "*1 passed*"
@@ -558,7 +558,7 @@ class TestMetafuncFunctional:
             def test_func(arg2):
                 assert arg2 == 10
         """)
-        result = testdir.runpytest_inprocess("-v", p)
+        result = testdir.runpytest("-v", p)
         result.stdout.fnmatch_lines([
             "*test_func*1*PASS*",
             "*1 passed*"
@@ -574,7 +574,7 @@ class TestMetafuncFunctional:
             def test_function(a, b):
                 assert a == b
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         assert result.ret == 1
         result.stdout.fnmatch_lines_random([
             "*test_function*basic*PASSED",
@@ -591,7 +591,7 @@ class TestMetafuncFunctional:
             def test_function(a, b):
                 assert 1
         """)
-        result = testdir.runpytest_inprocess("-v")
+        result = testdir.runpytest("-v")
         result.stdout.fnmatch_lines("""
             *test_function*1-b0*
             *test_function*1.3-b1*
@@ -647,7 +647,7 @@ class TestMetafuncFunctional:
             def test_function():
                 pass
         """)
-        reprec = testdir.runpytest_inprocess()
+        reprec = testdir.runpytest()
         reprec.assert_outcomes(passed=1)
 
     def test_generate_tests_only_done_in_subdir(self, testdir):
@@ -679,7 +679,7 @@ class TestMetafuncFunctional:
             test_x = make_tests()
             test_y = make_tests()
         """)
-        reprec = testdir.runpytest_inprocess()
+        reprec = testdir.runpytest()
         reprec.assert_outcomes(passed=4)
 
     @pytest.mark.issue463
diff --git a/testing/test_config.py b/testing/test_config.py
index 4e98befd9..c79de8480 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -39,7 +39,7 @@ class TestParseIni:
             [pytest]
             minversion=9.0
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.ret != 0
         result.stderr.fnmatch_lines([
             "*tox.ini:2*requires*9.0*actual*"
@@ -320,7 +320,7 @@ def test_cmdline_processargs_simple(testdir):
         def pytest_cmdline_preparse(args):
             args.append("-h")
     """)
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     result.stdout.fnmatch_lines([
         "*pytest*",
         "*-h*",
@@ -389,11 +389,11 @@ class TestWarning:
             def test_hello(fix):
                 pass
         """)
-        result = testdir.runpytest_inprocess()
+        result = testdir.runpytest()
         assert result.parseoutcomes()["warnings"] > 0
         assert "hello" not in result.stdout.str()
 
-        result = testdir.runpytest_inprocess("-rw")
+        result = testdir.runpytest("-rw")
         result.stdout.fnmatch_lines("""
             ===*warning summary*===
             *WT1*test_warn_on_test_item*:5*hello*
diff --git a/testing/test_nose.py b/testing/test_nose.py
index 58ccdfcb6..76873a834 100644
--- a/testing/test_nose.py
+++ b/testing/test_nose.py
@@ -18,7 +18,7 @@ def test_nose_setup(testdir):
         test_hello.setup = lambda: l.append(1)
         test_hello.teardown = lambda: l.append(2)
     """)
-    result = testdir.runpytest_inprocess(p, '-p', 'nose')
+    result = testdir.runpytest(p, '-p', 'nose')
     result.assert_outcomes(passed=2)
 
 
@@ -63,7 +63,7 @@ def test_nose_setup_func(testdir):
             assert l == [1,2]
 
     """)
-    result = testdir.runpytest_inprocess(p, '-p', 'nose')
+    result = testdir.runpytest(p, '-p', 'nose')
     result.assert_outcomes(passed=2)
 
 
@@ -85,7 +85,7 @@ def test_nose_setup_func_failure(testdir):
             assert l == [1,2]
 
     """)
-    result = testdir.runpytest_inprocess(p, '-p', 'nose')
+    result = testdir.runpytest(p, '-p', 'nose')
     result.stdout.fnmatch_lines([
         "*TypeError: <lambda>()*"
     ])
@@ -136,7 +136,7 @@ def test_nose_setup_partial(testdir):
         test_hello.setup = my_setup_partial
         test_hello.teardown = my_teardown_partial
     """)
-    result = testdir.runpytest_inprocess(p, '-p', 'nose')
+    result = testdir.runpytest(p, '-p', 'nose')
     result.stdout.fnmatch_lines([
         "*2 passed*"
     ])
@@ -203,7 +203,7 @@ def test_nose_test_generator_fixtures(testdir):
                 #expect.append('setup')
                 eq_(self.called, expect)
     """)
-    result = testdir.runpytest_inprocess(p, '-p', 'nose')
+    result = testdir.runpytest(p, '-p', 'nose')
     result.stdout.fnmatch_lines([
         "*10 passed*"
     ])
@@ -234,7 +234,7 @@ def test_module_level_setup(testdir):
             assert items[2] == 2
             assert 1 not in items
     """)
-    result = testdir.runpytest_inprocess('-p', 'nose')
+    result = testdir.runpytest('-p', 'nose')
     result.stdout.fnmatch_lines([
         "*2 passed*",
     ])
@@ -256,7 +256,7 @@ def test_nose_style_setup_teardown(testdir):
         def test_world():
             assert l == [1]
         """)
-    result = testdir.runpytest_inprocess('-p', 'nose')
+    result = testdir.runpytest('-p', 'nose')
     result.stdout.fnmatch_lines([
         "*2 passed*",
     ])
@@ -272,7 +272,7 @@ def test_nose_setup_ordering(testdir):
             def test_first(self):
                 pass
         """)
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     result.stdout.fnmatch_lines([
         "*1 passed*",
     ])
@@ -297,7 +297,7 @@ def test_apiwrapper_problem_issue260(testdir):
             def test_fun(self):
                 pass
         """)
-    result = testdir.runpytest_inprocess()
+    result = testdir.runpytest()
     result.assert_outcomes(passed=1)
 
 @pytest.mark.skipif("sys.version_info < (2,6)")
@@ -323,7 +323,7 @@ def test_setup_teardown_linking_issue265(testdir):
                 """Undoes the setup."""
                 raise Exception("should not call teardown for skipped tests")
         ''')
-    reprec = testdir.runpytest_inprocess()
+    reprec = testdir.runpytest()
     reprec.assert_outcomes(passed=1, skipped=1)
 
 
@@ -334,7 +334,7 @@ def test_SkipTest_during_collection(testdir):
         def test_failing():
             assert False
         """)
-    result = testdir.runpytest_inprocess(p)
+    result = testdir.runpytest(p)
     result.assert_outcomes(skipped=1)