CLI Implementation with Click (#2107)

* Initial CLI implementation with click package

* Adding fetch command for pulling examples and deepspeed configs

* Automating default options for CliArgs classes

* Mimicking existing no config behavior

* bugfix in choose_config

* Updating fetch to sync instead of re-download

* bugfix

* isort fix

* fixing yaml isort order

* pre-commit fixes

* simplifying argument parsing -- pass through kwargs to do_cli

* make accelerate launch default for non-preprocess commands

* fixing arg handling

* testing None placeholder approach

* removing hacky --use-gpu argument to preprocess command

* Adding brief README documentation for CLI

* remove (New)

* Initial CLI pytest tests

* progress on CLI pytest

* adding inference CLI tests; cleanup

* Refactor train CLI tests to remove various mocking

* Major CLI test refator; adding remaining CLI codepath test coverage

* pytest fixes

* remove integration markers

* parallelizing examples, deepspeed config downloads; rename test to match other CLI test naming

* moving cli pytest due to isolation issues; cleanup

* testing fixes; various minor improvements

* fix

* tests fix

* Update tests/cli/conftest.py

Co-authored-by: Wing Lian <wing.lian@gmail.com>

---------

Co-authored-by: Dan Saunders <dan@axolotl.ai>
Co-authored-by: Wing Lian <wing.lian@gmail.com>

tests/cli/test_cli_merge_lora.py

@@ -0,0 +1,56 @@
+"""pytest tests for axolotl CLI merge_lora command."""
+from unittest.mock import patch
+
+from axolotl.cli.main import cli
+
+
+def test_merge_lora_basic(cli_runner, config_path):
+    """Test basic merge_lora command"""
+    with patch("axolotl.cli.merge_lora.do_cli") as mock_do_cli:
+        result = cli_runner.invoke(cli, ["merge-lora", str(config_path)])
+        assert result.exit_code == 0
+
+        mock_do_cli.assert_called_once()
+        assert mock_do_cli.call_args.kwargs["config"] == str(config_path)
+
+
+def test_merge_lora_with_dirs(cli_runner, config_path, tmp_path):
+    """Test merge_lora with custom lora and output directories"""
+    lora_dir = tmp_path / "lora"
+    output_dir = tmp_path / "output"
+    lora_dir.mkdir()
+
+    with patch("axolotl.cli.merge_lora.do_cli") as mock_do_cli:
+        result = cli_runner.invoke(
+            cli,
+            [
+                "merge-lora",
+                str(config_path),
+                "--lora-model-dir",
+                str(lora_dir),
+                "--output-dir",
+                str(output_dir),
+            ],
+        )
+        assert result.exit_code == 0
+
+        mock_do_cli.assert_called_once()
+        assert mock_do_cli.call_args.kwargs["config"] == str(config_path)
+        assert mock_do_cli.call_args.kwargs["lora_model_dir"] == str(lora_dir)
+        assert mock_do_cli.call_args.kwargs["output_dir"] == str(output_dir)
+
+
+def test_merge_lora_nonexistent_config(cli_runner, tmp_path):
+    """Test merge_lora with nonexistent config"""
+    config_path = tmp_path / "nonexistent.yml"
+    result = cli_runner.invoke(cli, ["merge-lora", str(config_path)])
+    assert result.exit_code != 0
+
+
+def test_merge_lora_nonexistent_lora_dir(cli_runner, config_path, tmp_path):
+    """Test merge_lora with nonexistent lora directory"""
+    lora_dir = tmp_path / "nonexistent"
+    result = cli_runner.invoke(
+        cli, ["merge-lora", str(config_path), "--lora-model-dir", str(lora_dir)]
+    )
+    assert result.exit_code != 0