diff --git a/test_shell_command.py b/test_shell_command.py
new file mode 100644
index 0000000..aae978b
--- /dev/null
+++ b/test_shell_command.py
@@ -0,0 +1,94 @@
+import unittest
+
+from shell_command import (
+    ShellCommand, ConvertCommand, FFmpegConcatCommand, FFprobeCommand
+)
+
+
+class TestShellCommand(unittest.TestCase):
+    """Test the ShellCommand class.
+    """
+
+    def setUp(self):
+        """Test initialisation.
+        """
+        self.command = ShellCommand()
+
+    def tearDown(self):
+        """Test cleanup.
+        """
+        del(self.command)
+
+    def test_shellquote(self):
+        """Test static method ShellCommand.shellquote().
+        """
+        # empty => empty
+        self.assertEqual(ShellCommand.shellquote(""), "")
+        # foobar => foobar
+        self.assertEqual(ShellCommand.shellquote("foobar"), "foobar")
+        # foo bar => "foo bar"
+        self.assertEqual(ShellCommand.shellquote("foo bar"), '"foo bar"')
+        # "foobar" => '"foobar"'
+        self.assertEqual(ShellCommand.shellquote('"foobar"'), '\'"foobar"\'')
+        # 'foobar' => 'foobar'
+        self.assertEqual(ShellCommand.shellquote("'foobar'"), "'foobar'")
+        # foo 'bar' => "foo 'bar'"
+        self.assertEqual(ShellCommand.shellquote("foo 'bar'"), '"foo \'bar\'"')
+        # foo"bar => 'foo"bar'
+        self.assertEqual(ShellCommand.shellquote('foo"bar'), '\'foo"bar\'')
+        # foo.bar => "foo.bar"
+        self.assertEqual(ShellCommand.shellquote("foo.bar"), '"foo.bar"')
+        # foo(bar) => "foo(bar)"
+        self.assertEqual(ShellCommand.shellquote("foo(bar)"), '"foo(bar)"')
+        # [foobar] => "[foobar]"
+        self.assertEqual(ShellCommand.shellquote("[foobar]"), '"[foobar]"')
+        # foo[bar => "foo[bar"
+        self.assertEqual(ShellCommand.shellquote("foo[bar"), '"foo[bar"')
+        # /foo/bar => /foo/bar
+        self.assertEqual(ShellCommand.shellquote("/foo/bar"), "/foo/bar")
+        # -f => -f
+        self.assertEqual(ShellCommand.shellquote("-f"), "-f")
+        # --foobar => --foobar
+        self.assertEqual(ShellCommand.shellquote("--foobar"), "--foobar")
+        # ( => \(
+        self.assertEqual(ShellCommand.shellquote("("), r"\(")
+        # ) => \)
+        self.assertEqual(ShellCommand.shellquote(")"), r"\)")
+        # ' => "'"
+        self.assertEqual(ShellCommand.shellquote("'"), '"\'"')
+
+    def test_append_input_options(self):
+        """Test method ShellCommand.append_input_options.
+        """
+        # input_options should be [] initially
+        self.assertEqual(self.command.input_options, [])
+        # append [] => []
+        self.command.append_input_options([])
+        self.assertEqual(self.command.input_options, [])
+        # append ["foo"] => ["foo"]
+        self.command.append_input_options(["foo"])
+        self.assertEqual(self.command.input_options, ["foo"])
+        # append ["bar"] => ["foo", "bar"]
+        self.command.append_input_options(["bar"])
+        self.assertEqual(self.command.input_options, ["foo", "bar"])
+        # append ["baz", 42] => ["foo", "bar", "baz", 42]
+        self.command.append_input_options(["baz", 42])
+        self.assertEqual(self.command.input_options, ["foo", "bar", "baz", 42])
+
+    def test_prepend_input_options(self):
+        """Test method ShellCommand.prepend_input_options.
+        """
+        # input_options should be [] initially
+        self.assertEqual(self.command.input_options, [])
+        # prepend [] => []
+        self.command.prepend_input_options([])
+        self.assertEqual(self.command.input_options, [])
+        # prepend ["foo"] => ["foo"]
+        self.command.prepend_input_options(["foo"])
+        self.assertEqual(self.command.input_options, ["foo"])
+        # prepend ["bar"] => ["bar", "foo"]
+        self.command.prepend_input_options(["bar"])
+        self.assertEqual(self.command.input_options, ["bar", "foo"])
+        # prepend ["baz", 42] => ["baz", 42, "bar", "foo"]
+        self.command.prepend_input_options(["baz", 42])
+        self.assertEqual(self.command.input_options, ["baz", 42, "bar", "foo"])