diff --git a/sphinx_automodapi/tests/test_automodsumm.py b/sphinx_automodapi/tests/test_automodsumm.py
index fe14e9f..a04a8d7 100644
--- a/sphinx_automodapi/tests/test_automodsumm.py
+++ b/sphinx_automodapi/tests/test_automodsumm.py
@@ -49,10 +49,17 @@ def teardown_function(func):
 
 
 def write_api_files_to_tmpdir(tmpdir):
-    apidir = tmpdir.mkdir('api')
-    with open(apidir.join('sphinx_automodapi.tests.example_module.mixed.add.rst').strpath, 'w') as f:
+    apidir = tmpdir.mkdir("api")
+    with open(
+        apidir.join("sphinx_automodapi.tests.example_module.mixed.add.rst").strpath, "w"
+    ) as f:
         f.write(ADD_RST)
-    with open(apidir.join('sphinx_automodapi.tests.example_module.mixed.MixedSpam.rst').strpath, 'w') as f:
+    with open(
+        apidir.join(
+            "sphinx_automodapi.tests.example_module.mixed.MixedSpam.rst"
+        ).strpath,
+        "w",
+    ) as f:
         f.write(MIXEDSPAM_RST)
 
 
@@ -77,26 +84,24 @@ def write_api_files_to_tmpdir(tmpdir):
 
 
 def test_ams_to_asmry(tmpdir):
-
-    with open(tmpdir.join('index.rst').strpath, 'w') as f:
-        f.write(ams_to_asmry_str.format(options=''))
+    with open(tmpdir.join("index.rst").strpath, "w") as f:
+        f.write(ams_to_asmry_str.format(options=""))
 
     write_api_files_to_tmpdir(tmpdir)
 
     run_sphinx_in_tmpdir(tmpdir)
 
-    with open(tmpdir.join('index.rst.automodsumm').strpath) as f:
+    with open(tmpdir.join("index.rst.automodsumm").strpath) as f:
         result = f.read()
 
     assert result == ams_to_asmry_expected
 
 
 def test_too_many_options(tmpdir, capsys):
+    ops = ["", ":classes-only:", ":functions-only:"]
+    ostr = "\n    ".join(ops)
 
-    ops = ['', ':classes-only:', ':functions-only:']
-    ostr = '\n    '.join(ops)
-
-    with open(tmpdir.join('index.rst').strpath, 'w') as f:
+    with open(tmpdir.join("index.rst").strpath, "w") as f:
         f.write(ams_to_asmry_str.format(options=ostr))
 
     write_api_files_to_tmpdir(tmpdir)
@@ -104,8 +109,10 @@ def test_too_many_options(tmpdir, capsys):
     run_sphinx_in_tmpdir(tmpdir, expect_error=True)
 
     stdout, stderr = capsys.readouterr()
-    assert ("[automodsumm] Defined more than one of functions-only, "
-            "classes-only, and variables-only.  Skipping this directive." in stderr)
+    assert (
+        "[automodsumm] Defined more than one of functions-only, "
+        "classes-only, and variables-only.  Skipping this directive." in stderr
+    )
 
 
 ORDEREDDICT_RST = """
@@ -121,39 +128,59 @@ def test_too_many_options(tmpdir, capsys):
 """.strip()
 
 
-@pytest.mark.parametrize('options,expect', [
-    ('', ['add', 'MixedSpam']),
-    (':allowed-package-names: sphinx_automodapi', ['add', 'MixedSpam']),
-    (':allowed-package-names: collections', ['OrderedDict']),
-    (':allowed-package-names: sphinx_automodapi,collections',
-     ['add', 'MixedSpam', 'OrderedDict']),
-])
+@pytest.mark.parametrize(
+    "options,expect",
+    [
+        ("", ["add", "MixedSpam"]),
+        (":allowed-package-names: sphinx_automodapi", ["add", "MixedSpam"]),
+        (":allowed-package-names: collections", ["OrderedDict"]),
+        (
+            ":allowed-package-names: sphinx_automodapi,collections",
+            ["add", "MixedSpam", "OrderedDict"],
+        ),
+    ],
+)
 def test_am_allowed_package_names(options, expect, tmpdir):
     """
     Test that allowed_package_names is interpreted correctly.
     """
+
     def mixed2noall(s):
-        return s.replace('example_module.mixed', 'example_module.noall')
+        return s.replace("example_module.mixed", "example_module.noall")
 
     am_str = ams_to_asmry_str
-    with open(tmpdir.join('index.rst').strpath, 'w') as f:
-        f.write(mixed2noall(am_str).format(options=('   '+options if options else '')))
-
-    apidir = tmpdir.mkdir('api')
-    with open(apidir.join('sphinx_automodapi.tests.example_module.noall.add.rst').strpath, 'w') as f:
+    with open(tmpdir.join("index.rst").strpath, "w") as f:
+        f.write(
+            mixed2noall(am_str).format(options=("   " + options if options else ""))
+        )
+
+    apidir = tmpdir.mkdir("api")
+    with open(
+        apidir.join("sphinx_automodapi.tests.example_module.noall.add.rst").strpath, "w"
+    ) as f:
         f.write(mixed2noall(ADD_RST))
-    with open(apidir.join('sphinx_automodapi.tests.example_module.noall.MixedSpam.rst').strpath, 'w') as f:
+    with open(
+        apidir.join(
+            "sphinx_automodapi.tests.example_module.noall.MixedSpam.rst"
+        ).strpath,
+        "w",
+    ) as f:
         f.write(mixed2noall(MIXEDSPAM_RST))
-    with open(apidir.join('sphinx_automodapi.tests.example_module.noall.OrderedDict.rst').strpath, 'w') as f:
+    with open(
+        apidir.join(
+            "sphinx_automodapi.tests.example_module.noall.OrderedDict.rst"
+        ).strpath,
+        "w",
+    ) as f:
         f.write(ORDEREDDICT_RST)
 
     run_sphinx_in_tmpdir(tmpdir)
 
-    with open(tmpdir.join('index.rst.automodsumm').strpath) as f:
+    with open(tmpdir.join("index.rst.automodsumm").strpath) as f:
         result = f.read()
 
     for x in expect:
-        assert '   '+x in result
+        assert "   " + x in result
 
 
 PILOT_RST = """
@@ -187,17 +214,52 @@ def mixed2noall(s):
 
 
 def test_ams_cython(tmpdir, cython_testpackage):  # noqa
-
-    with open(tmpdir.join('index.rst').strpath, 'w') as f:
+    with open(tmpdir.join("index.rst").strpath, "w") as f:
         f.write(ams_cython_str)
 
-    apidir = tmpdir.mkdir('api')
-    with open(apidir.join('apyhtest_eva.unit02.pilot.rst').strpath, 'w') as f:
+    apidir = tmpdir.mkdir("api")
+    with open(apidir.join("apyhtest_eva.unit02.pilot.rst").strpath, "w") as f:
         f.write(PILOT_RST)
 
     run_sphinx_in_tmpdir(tmpdir)
 
-    with open(tmpdir.join('index.rst.automodsumm').strpath) as f:
+    with open(tmpdir.join("index.rst.automodsumm").strpath) as f:
         result = f.read()
 
     assert result == ams_cython_expected
+
+
+# =============================================================================
+
+sorted_str = """
+Before
+
+.. automodsumm:: sphinx_automodapi.tests.example_module.classes
+    :sort:
+
+And After
+"""
+
+sorted_expected = """\
+.. currentmodule:: sphinx_automodapi.tests.example_module.classes
+
+.. autosummary::
+
+    Egg
+    Spam
+
+"""
+
+
+def test_sort(tmpdir):
+    with open(tmpdir.join("index.rst").strpath, "w") as f:
+        f.write(sorted_str)
+
+    write_api_files_to_tmpdir(tmpdir)
+
+    run_sphinx_in_tmpdir(tmpdir)
+
+    with open(tmpdir.join("index.rst.automodsumm").strpath) as f:
+        result = f.read()
+
+    assert result == sorted_expected