cli: add ability to output docker compose file (#2379)

* Add ability to output docker compose file `langgraph dockerfile
Dockerfile --add-docker-compose`
* Add emoji in places

libs/cli/tests/unit_tests/cli/test_cli.py

@@ -1,4 +1,9 @@
+import json
 import pathlib
+import shutil
+import tempfile
+from contextlib import contextmanager
+from pathlib import Path
 
 from click.testing import CliRunner
 
@@ -14,7 +19,26 @@ DEFAULT_DOCKER_CAPABILITIES = DockerCapabilities(
 )
 
 
-def test_prepare_args_and_stdin():
+@contextmanager
+def temporary_config_folder(config_content: dict):
+    # Create a temporary directory
+    temp_dir = tempfile.mkdtemp()
+    try:
+        # Define the path for the config.json file
+        config_path = Path(temp_dir) / "config.json"
+
+        # Write the provided dictionary content to config.json
+        with open(config_path, "w", encoding="utf-8") as config_file:
+            json.dump(config_content, config_file)
+
+        # Yield the temporary directory path for use within the context
+        yield config_path.parent
+    finally:
+        # Cleanup the temporary directory and its contents
+        shutil.rmtree(temp_dir)
+
+
+def test_prepare_args_and_stdin() -> None:
     # this basically serves as an end-to-end test for using config and docker helpers
     config_path = pathlib.Path("./langgraph.json")
     config = validate_config(
@@ -28,7 +52,7 @@ def test_prepare_args_and_stdin():
         capabilities=DEFAULT_DOCKER_CAPABILITIES,
         config_path=config_path,
         config=config,
-        docker_compose="custom-docker-compose.yml",
+        docker_compose=pathlib.Path("custom-docker-compose.yml"),
         port=port,
         debugger_port=debugger_port,
         debugger_base_url=debugger_graph_url,
@@ -131,3 +155,90 @@ def test_version_option() -> None:
     assert (
         "LangGraph CLI, version" in result.output
     ), "Expected version information in output"
+
+
+def test_dockerfile_command_basic() -> None:
+    """Test the 'dockerfile' command with basic configuration."""
+    runner = CliRunner()
+    config_content = {
+        "node_version": "20",  # Add any other necessary configuration fields
+        "graphs": {"agent": "agent.py:graph"},
+    }
+
+    with temporary_config_folder(config_content) as temp_dir:
+        save_path = temp_dir / "Dockerfile"
+
+        result = runner.invoke(
+            cli,
+            ["dockerfile", str(save_path), "--config", str(temp_dir / "config.json")],
+        )
+
+        # Assert command was successful
+        assert result.exit_code == 0, result.output
+        assert "✅ Created: Dockerfile" in result.output
+
+        # Check if Dockerfile was created
+        assert save_path.exists()
+
+
+def test_dockerfile_command_with_docker_compose() -> None:
+    """Test the 'dockerfile' command with Docker Compose configuration."""
+    runner = CliRunner()
+    config_content = {
+        "dependencies": ["./my_agent"],
+        "graphs": {"agent": "./my_agent/agent.py:graph"},
+        "env": ".env",
+    }
+    with temporary_config_folder(config_content) as temp_dir:
+        save_path = temp_dir / "Dockerfile"
+        # Add agent.py file
+        agent_path = temp_dir / "my_agent" / "agent.py"
+        agent_path.parent.mkdir(parents=True, exist_ok=True)
+        agent_path.touch()
+
+        result = runner.invoke(
+            cli,
+            [
+                "dockerfile",
+                str(save_path),
+                "--config",
+                str(temp_dir / "config.json"),
+                "--add-docker-compose",
+            ],
+        )
+
+        # Assert command was successful
+        assert result.exit_code == 0
+        assert "✅ Created: Dockerfile" in result.output
+        assert "✅ Created: .dockerignore" in result.output
+        assert "✅ Created: docker-compose.yml" in result.output
+        assert (
+            "✅ Created: .env" in result.output or "➖ Skipped: .env" in result.output
+        )
+        assert "🎉 Files generated successfully" in result.output
+
+        # Check if Dockerfile, .dockerignore, docker-compose.yml, and .env were created
+        assert save_path.exists()
+        assert (temp_dir / ".dockerignore").exists()
+        assert (temp_dir / "docker-compose.yml").exists()
+        assert (temp_dir / ".env").exists() or "➖ Skipped: .env" in result.output
+
+
+def test_dockerfile_command_with_bad_config() -> None:
+    """Test the 'dockerfile' command with basic configuration."""
+    runner = CliRunner()
+    config_content = {
+        "node_version": "20"  # Add any other necessary configuration fields
+    }
+
+    with temporary_config_folder(config_content) as temp_dir:
+        save_path = temp_dir / "Dockerfile"
+
+        result = runner.invoke(
+            cli,
+            ["dockerfile", str(save_path), "--config", str(temp_dir / "conf.json")],
+        )
+
+        # Assert command was successful
+        assert result.exit_code == 2
+        assert "conf.json' does not exist" in result.output