diff --git a/shell_command/shared_tests.py b/shell_command/shared_tests.py
deleted file mode 100644
index d025db1..0000000
--- a/shell_command/shared_tests.py
+++ /dev/null
@@ -1,89 +0,0 @@
-import unittest
-
-from shell_command import ShellCommand
-
-
-class ShellCommandSharedTestCase(unittest.TestCase):
-    """Shared tests for ShellCommand and its subclasses."""
-
-    def setUp(self):
-        """Set up for test."""
-        # Make sure the input and output options are explicitly set to
-        # [] otherwise they hang around from previous tests.
-        self.command = ShellCommand(input_options=[], output_options=[])
-        self.expected_executable = ""
-        self.expected_base_options = []
-        self.expected_input_options = []
-        self.expected_filter_options = []
-        self.expected_output_options = []
-
-    def tearDown(self):
-        """Clean up after test."""
-        self.command = None
-
-    def test_base_options(self):
-        """Test that base options match expected."""
-        self.assertEqual(
-            self.command._base_options, self.expected_base_options)
-    
-    def test_input_options(self):
-        """Test that input options match expected."""
-        self.assertEqual(
-            self.command.input_options, self.expected_input_options)
-    
-    def test_output_options(self):
-        """Test that output options match expected."""
-        self.assertEqual(
-            self.command.output_options, self.expected_output_options)
-    
-    def test_executable_string(self):
-        """Test that executable path matches expected."""
-        with self.subTest(msg="unquoted paths match"):
-            self.assertEqual(
-                self.command.executable_string(quote=False),
-                self.expected_executable)
-        with self.subTest(msg="unquoted paths match"):
-            # Note: don't explicitly specify quoted value, because
-            # the executable path will vary across different systems.
-            self.assertEqual(
-                self.command.executable_string(quote=True),
-                ShellCommand.shellquote(self.expected_executable))
-
-    def test_argument_string(self):
-        """Test that argument string matches expected."""
-        args = (self.expected_base_options + self.expected_input_options +
-            self.expected_filter_options + self.expected_output_options)
-        with self.subTest(msg="unquoted agruments match"):
-            self.assertEqual(
-                self.command.argument_string(quote=False), " ".join(args))
-        with self.subTest(msg="quoted agruments match"):
-            self.assertEqual(
-                self.command.argument_string(quote=True),
-                " ".join([ShellCommand.shellquote(a) for a in args]))
-
-    def test_argument_list(self):
-        """Test that argument list matches expected."""
-        self.assertEqual(self.command.argument_list(),
-            self.expected_base_options + self.expected_input_options +
-            self.expected_filter_options + self.expected_output_options)
-
-    def test_command_string(self):
-        """Test that command string matches expected."""
-        args = (self.expected_base_options + self.expected_input_options +
-            self.expected_filter_options + self.expected_output_options)
-        expected_cmd_unquoted = (
-            "{exe} {arg}".format(exe=self.expected_executable,
-                arg=" ".join(args))
-        )
-        expected_cmd_quoted = (
-            '{exe} {arg}'.format(
-                exe=ShellCommand.shellquote(self.expected_executable),
-                arg=" ".join([ShellCommand.shellquote(a) for a in args]))
-        )
-        with self.subTest(msg="unquoted command string matches"):
-            self.assertEqual(
-                self.command.command_string(quote=False),
-                expected_cmd_unquoted)
-        with self.subTest(msg="quoted command string matches"):
-            self.assertEqual(
-                self.command.command_string(quote=True), expected_cmd_quoted)