Merge pull request 'Basic implementation of `pytest`' (#11) from add-tests into main

Reviewed-on: #11

.gitignore

@@ -9,6 +9,7 @@ cfg/*
 __pycache__/
 *.py[cod]
 *$py.class
+.venv
 
 # C extensions
 *.so

requirements.txt

@@ -2,3 +2,5 @@ pyyaml
 argparse
 pylint
 build
+pytest
+cli_test_helpers

src/tfscript/writing.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from os.path import exists
 from tempfile import NamedTemporaryFile
 

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")

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()