fix: write updated lock spec to file in add-wheels command (#36)

* fix: write updated lock spec to file in add-wheels command

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Updated failing tests

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fixed pre commit issues

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: mohankumarelec

pyodide_lock/cli.py

@@ -47,7 +47,7 @@ def add_wheels(
 
     """
     sp = PyodideLockSpec.from_json(input)
-    add_wheels_to_spec(
+    sp = add_wheels_to_spec(
         sp,
         wheels,
         base_path=base_path,

tests/test_cli.py

@@ -0,0 +1,31 @@
+from typer.testing import CliRunner
+
+from pyodide_lock.cli import main
+from pyodide_lock.spec import PyodideLockSpec
+
+runner = CliRunner()
+
+
+def test_add_wheels_cli_integration(tmp_path, example_lock_spec, test_wheel_list):
+    """Test that the CLI command correctly calls and writes output."""
+    input_file = tmp_path / "input.json"
+    output_file = tmp_path / "output.json"
+    example_lock_spec.to_json(input_file)
+
+    result = runner.invoke(
+        main,
+        [
+            str(test_wheel_list[0]),
+            "--input",
+            str(input_file),
+            "--output",
+            str(output_file),
+        ],
+    )
+
+    assert result.exit_code == 0
+    assert output_file.exists()
+
+    # Verify the output file contains the added wheel
+    new_spec = PyodideLockSpec.from_json(output_file)
+    assert "py-one" in new_spec.packages