"""Unit tests for hello.py module."""

import subprocess
import unittest
from pathlib import Path


class TestHelloOutput(unittest.TestCase):
    """Tests for hello.py output behavior."""

    def setUp(self):
        """Set up test fixtures."""
        self.hello_script = Path(__file__).parent.parent / "hello.py"
        self.working_dir = Path(__file__).parent.parent

    def test_hello_prints_expected_message(self):
        """Test that hello.py prints 'Hello, World!' to stdout."""
        result = subprocess.run(
            ["python3", str(self.hello_script)],
            capture_output=True,
            text=True,
            cwd=self.working_dir
        )
        self.assertIn("Hello, World!", result.stdout)

    def test_hello_exact_output(self):
        """Test that hello.py output matches exactly (with newline)."""
        result = subprocess.run(
            ["python3", str(self.hello_script)],
            capture_output=True,
            text=True,
            cwd=self.working_dir
        )
        self.assertEqual(result.stdout.strip(), "Hello, World!")

    def test_hello_exit_code_zero(self):
        """Test that hello.py exits with code 0."""
        result = subprocess.run(
            ["python3", str(self.hello_script)],
            capture_output=True,
            text=True,
            cwd=self.working_dir
        )
        self.assertEqual(result.returncode, 0)

    def test_hello_no_stderr(self):
        """Test that hello.py produces no stderr output."""
        result = subprocess.run(
            ["python3", str(self.hello_script)],
            capture_output=True,
            text=True,
            cwd=self.working_dir
        )
        self.assertEqual(result.stderr, "")

    def test_hello_stdout_not_empty(self):
        """Test that hello.py produces non-empty stdout."""
        result = subprocess.run(
            ["python3", str(self.hello_script)],
            capture_output=True,
            text=True,
            cwd=self.working_dir
        )
        self.assertTrue(len(result.stdout) > 0)


class TestHelloFileExists(unittest.TestCase):
    """Tests for hello.py file existence and content."""

    def setUp(self):
        """Set up test fixtures."""
        self.hello_script = Path(__file__).parent.parent / "hello.py"

    def test_hello_file_exists(self):
        """Test that hello.py file exists."""
        self.assertTrue(self.hello_script.exists())

    def test_hello_file_is_python(self):
        """Test that hello.py has .py extension."""
        self.assertEqual(self.hello_script.suffix, ".py")

    def test_hello_file_contains_print(self):
        """Test that hello.py contains a print statement."""
        content = self.hello_script.read_text()
        self.assertIn("print", content)

    def test_hello_file_contains_hello_world(self):
        """Test that hello.py contains 'Hello, World!' string."""
        content = self.hello_script.read_text()
        self.assertIn("Hello, World!", content)


if __name__ == "__main__":
    unittest.main()