diff --git a/.gitignore b/.gitignore
index 235500f..5f473cd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ cfg/*
 __pycache__/
 *.py[cod]
 *$py.class
+.venv
 
 # C extensions
 *.so
diff --git a/requirements.txt b/requirements.txt
index 58ea118..da599ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,5 @@ pyyaml
 argparse
 pylint
 build
+pytest
+cli_test_helpers
\ No newline at end of file
diff --git a/src/tfscript/writing.py b/src/tfscript/writing.py
index c704061..7138eaf 100644
--- a/src/tfscript/writing.py
+++ b/src/tfscript/writing.py
@@ -1,4 +1,5 @@
 import os
+import sys
 from os.path import exists
 from tempfile import NamedTemporaryFile
 
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..3f68015
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,38 @@
+"""
+Tests that we can import and execute the most basic valid test file.
+Uses: tests/validYAML.yaml
+"""
+import pytest
+import tfscript.cli
+from cli_test_helpers import ArgvContext, shell
+
+class TestCLI:
+
+    def test_debug_opt(self):
+        """Is debug argument available?"""
+        with ArgvContext('tfscript', '-d', 'tests/validYAML.yaml'):
+            parser = tfscript.cli.parseCLI()
+            args = parser.parse_args()
+        assert args.debug == True
+
+    def test_dry_run_opt(self):
+        """Is dry-run argument available?"""
+        with ArgvContext('tfscript', '-n', 'tests/validYAML.yaml'):
+            parser = tfscript.cli.parseCLI()
+            args = parser.parse_args()
+        assert args.dry_run == True
+
+    def test_directory_opt(self):
+        """Use . because it's sure to exist on all platforms."""
+        with ArgvContext('tfscript', '--directory', '.', 'tests/validYAML.yaml'):
+            parser = tfscript.cli.parseCLI()
+            args = parser.parse_args()
+        assert args.directory == '.'
+
+    def test_cli(self):
+        """
+        Does CLI stop execution w/o a filename positional argument?
+        """
+        with pytest.raises(SystemExit):
+            tfscript.cli.main()
+            pytest.fail("Should abort without positional filename argument")
\ No newline at end of file
diff --git a/tests/test_valid_yaml.py b/tests/test_valid_yaml.py
new file mode 100644
index 0000000..b187722
--- /dev/null
+++ b/tests/test_valid_yaml.py
@@ -0,0 +1,15 @@
+"""
+Tests that we can import and execute the most basic valid test file.
+Uses: tests/validYAML.yaml
+"""
+import pytest
+import tfscript.cli
+from cli_test_helpers import ArgvContext, shell
+
+class TestValidYaml:
+
+    def test_parseValidFile(self, tmp_path):
+        """Parse the basic test file."""
+        with ArgvContext('tfscript', '--directory', str(tmp_path),
+            '-d', 'tests/validYAML.yaml'):
+            tfscript.cli.main()