Add tests of relink.py as called from command line.

Author: samsrabin

tests/test_relink.py

@@ -9,6 +9,7 @@
 import pwd
 import logging
 import argparse
+import subprocess
 from unittest.mock import patch
 
 import pytest
@@ -902,3 +903,89 @@ def test_dry_run_no_delete_or_create_messages(self, dry_run_setup, caplog):
         assert "Created symbolic link:" not in caplog.text
         # But the dry-run message should be there
         assert "[DRY RUN] Would create symbolic link: " in caplog.text
+
+
+class TestCommandLineExecution:
+    """Test suite for command-line execution of relink.py."""
+
+    @pytest.fixture
+    def mock_dirs(self, tmp_path):
+        """Create temporary directories and files for command-line testing."""
+        source_dir = tmp_path / "source"
+        target_dir = tmp_path / "target"
+        source_dir.mkdir()
+        target_dir.mkdir()
+
+        # Create a test file
+        source_file = source_dir / "test_file.txt"
+        target_file = target_dir / "test_file.txt"
+        source_file.write_text("source content")
+        target_file.write_text("target content")
+
+        return source_dir, target_dir, source_file, target_file
+
+    def test_command_line_execution_dry_run(self, mock_dirs):
+        """Test executing relink.py from command line with --dry-run flag."""
+        source_dir, target_dir, source_file, _ = mock_dirs
+
+        # Get the path to relink.py
+        relink_script = os.path.join(
+            os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "relink.py"
+        )
+
+        # Build the command
+        command = [
+            sys.executable,
+            relink_script,
+            "--source-root",
+            str(source_dir),
+            "--target-root",
+            str(target_dir),
+            "--dry-run",
+        ]
+
+        # Execute the command
+        result = subprocess.run(command, capture_output=True, text=True, check=False)
+
+        # Verify the command executed successfully
+        assert result.returncode == 0, f"Command failed with stderr: {result.stderr}"
+
+        # Verify dry-run messages in output
+        assert "DRY RUN MODE" in result.stdout
+        assert "[DRY RUN] Would create symbolic link:" in result.stdout
+
+        # Verify no actual changes were made
+        assert source_file.is_file()
+        assert not source_file.is_symlink()
+
+    def test_command_line_execution_actual_run(self, mock_dirs):
+        """Test executing relink.py from command line without dry-run."""
+        source_dir, target_dir, source_file, target_file = mock_dirs
+
+        # Get the path to relink.py
+        relink_script = os.path.join(
+            os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "relink.py"
+        )
+
+        # Build the command
+        command = [
+            sys.executable,
+            relink_script,
+            "--source-root",
+            str(source_dir),
+            "--target-root",
+            str(target_dir),
+        ]
+
+        # Execute the command
+        result = subprocess.run(command, capture_output=True, text=True, check=False)
+
+        # Verify the command executed successfully
+        assert result.returncode == 0, f"Command failed with stderr: {result.stderr}"
+
+        # Verify the file was converted to a symlink
+        assert source_file.is_symlink()
+        assert os.readlink(str(source_file)) == str(target_file)
+
+        # Verify success messages in output
+        assert "Created symbolic link:" in result.stdout