diff --git a/.travis.yml b/.travis.yml
index a319c0922..3936e599b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,8 +25,6 @@ env:
     - TOXENV=py36-numpy
     - TOXENV=py36-pluggymaster PYTEST_NO_COVERAGE=1
     - TOXENV=py27-nobyte
-    - TOXENV=doctesting
-    - TOXENV=docs PYTEST_NO_COVERAGE=1
 
 jobs:
   include:
@@ -61,7 +59,7 @@ jobs:
       env: TOXENV=py27
     - env: TOXENV=py34
     - env: TOXENV=py36
-    - env: TOXENV=linting PYTEST_NO_COVERAGE=1
+    - env: TOXENV=linting,docs,doctesting PYTEST_NO_COVERAGE=1
 
     - stage: deploy
       python: '3.6'
diff --git a/appveyor.yml b/appveyor.yml
index 7e2c16561..efc880638 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,6 +1,6 @@
 environment:
   matrix:
-  - TOXENV: "linting"
+  - TOXENV: "linting,docs,doctesting"
     PYTEST_NO_COVERAGE: "1"
   - TOXENV: "py27"
   - TOXENV: "py34"
@@ -20,11 +20,8 @@ environment:
   - TOXENV: "py36-pluggymaster"
     PYTEST_NO_COVERAGE: "1"
   - TOXENV: "py27-nobyte"
-  - TOXENV: "doctesting"
   - TOXENV: "py36-freeze"
     PYTEST_NO_COVERAGE: "1"
-  - TOXENV: "docs"
-    PYTEST_NO_COVERAGE: "1"
 
 install:
   - echo Installed Pythons
diff --git a/changelog/3713.doc.rst b/changelog/3713.doc.rst
new file mode 100644
index 000000000..c1d6b51b8
--- /dev/null
+++ b/changelog/3713.doc.rst
@@ -0,0 +1 @@
+Update usefixtures documentation to clarify that it can't be used with fixture functions.
diff --git a/changelog/4093.trivial.rst b/changelog/4093.trivial.rst
new file mode 100644
index 000000000..cbfbeb00d
--- /dev/null
+++ b/changelog/4093.trivial.rst
@@ -0,0 +1 @@
+Fixed formatting of string literals in internal tests.
diff --git a/doc/en/example/assertion/failure_demo.py b/doc/en/example/assertion/failure_demo.py
index 33fff5565..ae2f5acb2 100644
--- a/doc/en/example/assertion/failure_demo.py
+++ b/doc/en/example/assertion/failure_demo.py
@@ -245,9 +245,9 @@ class TestCustomAssertMsg(object):
             a = 1
 
         b = 2
-        assert A.a == b, (
-            "A.a appears not to be b\n" "or does not appear to be b\none of those"
-        )
+        assert (
+            A.a == b
+        ), "A.a appears not to be b\nor does not appear to be b\none of those"
 
     def test_custom_repr(self):
         class JSON(object):
diff --git a/doc/en/example/reportingdemo.rst b/doc/en/example/reportingdemo.rst
index a411aa49a..fb117d06c 100644
--- a/doc/en/example/reportingdemo.rst
+++ b/doc/en/example/reportingdemo.rst
@@ -582,7 +582,7 @@ get on the terminal - we are working on that)::
             b = 2
     >       assert (
                 A.a == b
-            ), "A.a appears not to be b\n" "or does not appear to be b\none of those"
+            ), "A.a appears not to be b\nor does not appear to be b\none of those"
     E       AssertionError: A.a appears not to be b
     E         or does not appear to be b
     E         one of those
diff --git a/doc/en/reference.rst b/doc/en/reference.rst
index 93cd78b64..632bb4e36 100644
--- a/doc/en/reference.rst
+++ b/doc/en/reference.rst
@@ -178,7 +178,7 @@ Mark a test function as using the given fixture names.
 
 .. warning::
 
-    This mark can be used with *test functions* only, having no affect when applied
+    This mark has no effect when applied
     to a **fixture** function.
 
 .. py:function:: pytest.mark.usefixtures(*names)
diff --git a/src/_pytest/assertion/util.py b/src/_pytest/assertion/util.py
index a3013cb98..15724ed32 100644
--- a/src/_pytest/assertion/util.py
+++ b/src/_pytest/assertion/util.py
@@ -199,7 +199,7 @@ def _diff_text(left, right, verbose=False):
         if i > 42:
             i -= 10  # Provide some context
             explanation = [
-                u("Skipping %s identical leading " "characters in diff, use -v to show")
+                u("Skipping %s identical leading characters in diff, use -v to show")
                 % i
             ]
             left = left[i:]
diff --git a/src/_pytest/cacheprovider.py b/src/_pytest/cacheprovider.py
index fd8ef8fc0..94f42e8cf 100755
--- a/src/_pytest/cacheprovider.py
+++ b/src/_pytest/cacheprovider.py
@@ -343,7 +343,7 @@ def cacheshow(config, session):
         key = valpath.relative_to(vdir)
         val = config.cache.get(key, dummy)
         if val is dummy:
-            tw.line("%s contains unreadable content, " "will be ignored" % key)
+            tw.line("%s contains unreadable content, will be ignored" % key)
         else:
             tw.line("%s contains:" % key)
             for line in pformat(val).splitlines():
diff --git a/src/_pytest/capture.py b/src/_pytest/capture.py
index 97b88ee9d..dfb488968 100644
--- a/src/_pytest/capture.py
+++ b/src/_pytest/capture.py
@@ -654,7 +654,7 @@ class DontReadFromInput(six.Iterator):
         return self
 
     def fileno(self):
-        raise UnsupportedOperation("redirected stdin is pseudofile, " "has no fileno()")
+        raise UnsupportedOperation("redirected stdin is pseudofile, has no fileno()")
 
     def isatty(self):
         return False
diff --git a/src/_pytest/compat.py b/src/_pytest/compat.py
index 3798f4eb1..0cf0e41c2 100644
--- a/src/_pytest/compat.py
+++ b/src/_pytest/compat.py
@@ -268,7 +268,7 @@ def get_real_func(obj):
         obj = new_obj
     else:
         raise ValueError(
-            ("could not find real function of {start}" "\nstopped at {current}").format(
+            ("could not find real function of {start}\nstopped at {current}").format(
                 start=py.io.saferepr(start_obj), current=py.io.saferepr(obj)
             )
         )
diff --git a/src/_pytest/deprecated.py b/src/_pytest/deprecated.py
index 19c2d2818..54886c999 100644
--- a/src/_pytest/deprecated.py
+++ b/src/_pytest/deprecated.py
@@ -92,7 +92,7 @@ RECORD_XML_PROPERTY = RemovedInPytest4Warning(
 )
 
 COLLECTOR_MAKEITEM = RemovedInPytest4Warning(
-    "pycollector makeitem was removed " "as it is an accidentially leaked internal api"
+    "pycollector makeitem was removed as it is an accidentially leaked internal api"
 )
 
 METAFUNC_ADD_CALL = RemovedInPytest4Warning(
diff --git a/src/_pytest/helpconfig.py b/src/_pytest/helpconfig.py
index 85f071e9e..88bef95fc 100644
--- a/src/_pytest/helpconfig.py
+++ b/src/_pytest/helpconfig.py
@@ -139,7 +139,7 @@ def showhelp(config):
     tw.line()
     tw.line()
     tw.line(
-        "[pytest] ini-options in the first " "pytest.ini|tox.ini|setup.cfg file found:"
+        "[pytest] ini-options in the first pytest.ini|tox.ini|setup.cfg file found:"
     )
     tw.line()
 
diff --git a/src/_pytest/python.py b/src/_pytest/python.py
index 8337c7469..ef3e3a730 100644
--- a/src/_pytest/python.py
+++ b/src/_pytest/python.py
@@ -99,7 +99,7 @@ def pytest_addoption(parser):
         "python_functions",
         type="args",
         default=["test"],
-        help="prefixes or glob names for Python test function and " "method discovery",
+        help="prefixes or glob names for Python test function and method discovery",
     )
 
     group.addoption(
diff --git a/src/_pytest/recwarn.py b/src/_pytest/recwarn.py
index 6ca1b0384..62c9158fb 100644
--- a/src/_pytest/recwarn.py
+++ b/src/_pytest/recwarn.py
@@ -175,7 +175,7 @@ class WarningsChecker(WarningsRecorder):
     def __init__(self, expected_warning=None, match_expr=None):
         super(WarningsChecker, self).__init__()
 
-        msg = "exceptions must be old-style classes or " "derived from Warning, not %s"
+        msg = "exceptions must be old-style classes or derived from Warning, not %s"
         if isinstance(expected_warning, tuple):
             for exc in expected_warning:
                 if not inspect.isclass(exc):
diff --git a/src/_pytest/terminal.py b/src/_pytest/terminal.py
index 125eb97c4..f4dbbe61a 100644
--- a/src/_pytest/terminal.py
+++ b/src/_pytest/terminal.py
@@ -835,9 +835,7 @@ def repr_pythonversion(v=None):
 
 
 def build_summary_stats_line(stats):
-    keys = (
-        "failed passed skipped deselected " "xfailed xpassed warnings error"
-    ).split()
+    keys = ("failed passed skipped deselected xfailed xpassed warnings error").split()
     unknown_key_seen = False
     for key in stats.keys():
         if key not in keys:
diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 1728f1ff4..e324f55ab 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -628,7 +628,7 @@ class TestInvocationVariants(object):
             lib = ns.mkdir(dirname)
             lib.ensure("__init__.py")
             lib.join("test_{}.py".format(dirname)).write(
-                "def test_{}(): pass\n" "def test_other():pass".format(dirname)
+                "def test_{}(): pass\ndef test_other():pass".format(dirname)
             )
 
         # The structure of the test directory is now:
@@ -717,10 +717,10 @@ class TestInvocationVariants(object):
         lib = foo.mkdir("bar")
         lib.ensure("__init__.py")
         lib.join("test_bar.py").write(
-            "def test_bar(): pass\n" "def test_other(a_fixture):pass"
+            "def test_bar(): pass\ndef test_other(a_fixture):pass"
         )
         lib.join("conftest.py").write(
-            "import pytest\n" "@pytest.fixture\n" "def a_fixture():pass"
+            "import pytest\n@pytest.fixture\ndef a_fixture():pass"
         )
 
         d_local = testdir.mkdir("local")
diff --git a/testing/logging/test_formatter.py b/testing/logging/test_formatter.py
index 0348b215c..84ef4dd2f 100644
--- a/testing/logging/test_formatter.py
+++ b/testing/logging/test_formatter.py
@@ -26,10 +26,10 @@ def test_coloredlogformatter():
     formatter = ColoredLevelFormatter(tw, logfmt)
     output = formatter.format(record)
     assert output == (
-        "dummypath                   10 " "\x1b[32mINFO    \x1b[0m Test Message"
+        "dummypath                   10 \x1b[32mINFO    \x1b[0m Test Message"
     )
 
     tw.hasmarkup = False
     formatter = ColoredLevelFormatter(tw, logfmt)
     output = formatter.format(record)
-    assert output == ("dummypath                   10 " "INFO     Test Message")
+    assert output == ("dummypath                   10 INFO     Test Message")
diff --git a/testing/test_junitxml.py b/testing/test_junitxml.py
index 2304c4a50..29d3f7f6e 100644
--- a/testing/test_junitxml.py
+++ b/testing/test_junitxml.py
@@ -476,7 +476,7 @@ class TestPython(object):
         tnode.assert_attr(
             file="test_junit_prefixing.py",
             line="3",
-            classname="xyz.test_junit_prefixing." "TestHello",
+            classname="xyz.test_junit_prefixing.TestHello",
             name="test_hello",
         )
 
diff --git a/testing/test_pdb.py b/testing/test_pdb.py
index 246f514b4..4739f0e2d 100644
--- a/testing/test_pdb.py
+++ b/testing/test_pdb.py
@@ -147,7 +147,7 @@ class TestPDB(object):
         child = testdir.spawn_pytest("--pdb %s" % p1)
         child.expect(".*def test_1")
         child.expect(".*i = 0")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -174,7 +174,7 @@ class TestPDB(object):
         """
         )
         child = testdir.spawn_pytest("--pdb %s" % p1)
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendline("p self.filename")
         child.sendeof()
         rest = child.read().decode("utf8")
@@ -209,7 +209,7 @@ class TestPDB(object):
         child = testdir.spawn_pytest("--pdb %s" % p1)
         child.expect("captured stdout")
         child.expect("get rekt")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -228,7 +228,7 @@ class TestPDB(object):
         child = testdir.spawn_pytest("--pdb %s" % p1)
         child.expect("captured stderr")
         child.expect("get rekt")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -243,7 +243,7 @@ class TestPDB(object):
         """
         )
         child = testdir.spawn_pytest("--pdb %s" % p1)
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         output = child.before.decode("utf8")
         child.sendeof()
         assert "captured stdout" not in output
@@ -266,7 +266,7 @@ class TestPDB(object):
         if showcapture in ("all", "log"):
             child.expect("captured log")
             child.expect("get rekt")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -281,13 +281,11 @@ class TestPDB(object):
                 assert False
         """
         )
-        child = testdir.spawn_pytest(
-            "--show-capture=all --pdb " "-p no:logging %s" % p1
-        )
+        child = testdir.spawn_pytest("--show-capture=all --pdb -p no:logging %s" % p1)
         child.expect("get rekt")
         output = child.before.decode("utf8")
         assert "captured log" not in output
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -306,7 +304,7 @@ class TestPDB(object):
         child = testdir.spawn_pytest("--pdb %s" % p1)
         child.expect(".*def test_1")
         child.expect(".*pytest.raises.*globalfunc")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendline("globalfunc")
         child.expect(".*function")
         child.sendeof()
@@ -322,7 +320,7 @@ class TestPDB(object):
         )
         child = testdir.spawn_pytest("--pdb %s" % p1)
         # child.expect(".*import pytest.*")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         child.expect("1 error")
         self.flush(child)
@@ -337,7 +335,7 @@ class TestPDB(object):
         p1 = testdir.makepyfile("def test_func(): pass")
         child = testdir.spawn_pytest("--pdb %s" % p1)
         # child.expect(".*import pytest.*")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         self.flush(child)
 
@@ -355,7 +353,7 @@ class TestPDB(object):
         child = testdir.spawn_pytest(str(p1))
         child.expect("test_1")
         child.expect("x = 3")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf-8")
         assert "1 failed" in rest
@@ -373,7 +371,7 @@ class TestPDB(object):
         )
         child = testdir.spawn_pytest(str(p1))
         child.expect("test_1")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -448,10 +446,10 @@ class TestPDB(object):
         """
         )
         child = testdir.spawn_pytest("--doctest-modules --pdb %s" % p1)
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendline("i")
         child.expect("0")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -474,9 +472,10 @@ class TestPDB(object):
         child = testdir.spawn_pytest(str(p1))
         child.expect("test_1")
         child.expect("x = 3")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendline("c")
         child.expect("x = 4")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -495,6 +494,7 @@ class TestPDB(object):
         )
         child = testdir.spawn("{} {}".format(sys.executable, p1))
         child.expect("x = 5")
+        child.expect("Pdb")
         child.sendeof()
         self.flush(child)
 
@@ -511,6 +511,7 @@ class TestPDB(object):
         )
         child = testdir.spawn_pytest(str(p1))
         child.expect("x = 5")
+        child.expect("Pdb")
         child.sendeof()
         self.flush(child)
 
@@ -690,7 +691,7 @@ class TestDebuggingBreakpoints(object):
         )
         child = testdir.spawn_pytest(str(p1))
         child.expect("test_1")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -710,7 +711,7 @@ class TestDebuggingBreakpoints(object):
         )
         child = testdir.spawn_pytest(str(p1))
         child.expect("test_1")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 failed" in rest
@@ -728,7 +729,7 @@ class TestTraceOption:
         )
         child = testdir.spawn_pytest("--trace " + str(p1))
         child.expect("test_1")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 passed" in rest
@@ -747,7 +748,7 @@ class TestTraceOption:
         )
         child = testdir.spawn_pytest("--trace " + str(p1))
         child.expect("is_equal")
-        child.expect("(Pdb)")
+        child.expect("Pdb")
         child.sendeof()
         rest = child.read().decode("utf8")
         assert "1 passed" in rest