Add pytest compatible sanity check.

tests/conftest.py

@@ -0,0 +1,29 @@
+import os
+import yaml
+
+import pytest
+
+_real_stack_path = os.path.realpath('./stack.yml')
+with open(_real_stack_path, 'r') as stack_yaml:
+    _stack_data = yaml.safe_load(stack_yaml)
+
+
+@pytest.fixture(scope='session')
+def stack_dir():
+    return os.path.dirname(_real_stack_path)
+
+
+@pytest.fixture(scope='session')
+def stack_data():
+    return _stack_data
+
+
+def pytest_generate_tests(metafunc):
+    if 'stack_function' in metafunc.fixturenames:
+        data = []
+        for function, values in _stack_data['functions'].items():
+            values.setdefault('function', function)
+            data.append(values)
+
+        metafunc.parametrize('stack_function',
+                             data)

tests/test_stack_yaml.py

@@ -0,0 +1,74 @@
+import os
+import pytest
+
+
+def test_stack_functions(stack_data):
+    errMsg = 'Error: \'stack.yml\' file does not contain any functions.'
+    assert 'functions' in stack_data, errMsg
+
+
+def test_git_ignore(stack_dir):
+    path = os.path.join(stack_dir, '.gitignore')
+    errMsg = f'Error: No \'.gitignore\' file found in {stack_dir}.'
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_handlers(stack_function, stack_dir):
+    path = os.path.join(stack_dir, stack_function['handler'])
+    errMsg = f'Error: No directory for {stack_function["handler"]}.'
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_handlers_file(stack_function, stack_dir):
+    path = os.path.join(stack_dir, stack_function['handler'], 'handler.py')
+    errMsg = (f'Error: \'{stack_function["handler"]}\' does not contain '
+              '\'handler.py\' file.')
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_handlers_requires(stack_function, stack_dir):
+    path = os.path.join(stack_dir, stack_function['handler'],
+                        'requirements.txt')
+    errMsg = (f'Error: \'{stack_function["handler"]}\' does not contain '
+              '\'requirements.txt\' file.')
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_handlers_init(stack_function, stack_dir):
+    path = os.path.join(stack_dir, stack_function['handler'],
+                        '__init__.py')
+    errMsg = (f'Error: \'{stack_function["handler"]}\' does not contain '
+              '\'__init__.py\' file.')
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_langs(stack_function, stack_dir):
+    path = os.path.join(stack_dir, 'template', stack_function['lang'])
+    errMsg = (f'Error: No directory for {stack_function["lang"]} is present in '
+              '\'template\' directory.')
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_langs_dockerfile(stack_function, stack_dir):
+    path = os.path.join(stack_dir, 'template', stack_function['lang'],
+                        'Dockerfile')
+    errMsg = (f'Error: \'template/{stack_function["lang"]}/\' does not contain '
+              '\'Dockerfile\'.')
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_stack_langs_requires(stack_function, stack_dir):
+    path = os.path.join(stack_dir, 'template', stack_function['lang'],
+                        'requirements.txt')
+    errMsg = (f'Error: \'template/{stack_function["lang"]}/\' does not contain '
+              '\'requirements.txt\' file.')
+    assert os.path.exists(os.path.realpath(path)), errMsg
+
+
+def test_only_langs(stack_data, stack_dir):
+    lang_set = {v['lang'] for k, v in stack_data['functions'].items()}
+    dir_set = set(os.listdir(os.path.join(stack_dir, 'template')))
+    warnMsg = ('Warning: Unused language templates are present in \'template\' '
+               'directory.')
+
+    assert len(dir_set - lang_set) == 0, warnMsg