test: examples

Pipfile

@@ -10,6 +10,7 @@ typing-extensions = ">=3.10.0.2"
 black = ">=24.1.1"
 isort = ">=5.13.2"
 clea = ">=0.1.0rc4"
+pytest = "==7.4.2"
 
 [requires]
 python_version = "3.10"

linters.ini

@@ -39,3 +39,6 @@ ignore_missing_imports = True
 
 [mypy-clea.*]
 ignore_missing_imports = True
+
+[mypy-pytest.*]
+ignore_missing_imports = True

tests/test_examples.py

@@ -0,0 +1,31 @@
+"""Test examples."""
+
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+EXAMPLES = list((Path(__file__).parent.parent / "examples").glob("*.py"))
+
+ALLOWED_TO_FAIL = {
+    "missing_placeholders.py": (
+        "Error rendering 'Hello, ${name|John Doe}, "
+        "I'm ${age} years old and I like ${food|Coffee}'; "
+        "Value for 'age' not provided"
+    ),
+}
+
+
+@pytest.mark.parametrize("example", EXAMPLES)
+def test_example(example: Path) -> None:
+    """Test example."""
+    with subprocess.Popen(
+        [sys.executable, example], stdout=subprocess.PIPE, stderr=subprocess.PIPE
+    ) as process:
+        process.wait()
+        if example.name in ALLOWED_TO_FAIL:
+            assert process.returncode == 1, process.stderr.read().decode()  # type: ignore
+            assert ALLOWED_TO_FAIL[example.name] in process.stderr.read().decode()  # type: ignore
+        else:
+            assert process.returncode == 0, process.stderr.read().decode()  # type: ignore