test: generate file from CLI in a temporary directory (#618)

Signed-off-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>

tests/test_cli.py

@@ -1,3 +1,5 @@
+from pathlib import Path
+
 from typer.testing import CliRunner
 
 from docling.cli.main import app
@@ -15,6 +17,11 @@ def test_cli_version():
     assert result.exit_code == 0
 
 
-def test_cli_convert():
-    result = runner.invoke(app, ["./tests/data/2305.03393v1-pg9.pdf"])
+def test_cli_convert(tmp_path):
+    source = "./tests/data/2305.03393v1-pg9.pdf"
+    output = tmp_path / "out"
+    output.mkdir()
+    result = runner.invoke(app, [source, "--output", str(output)])
     assert result.exit_code == 0
+    converted = output / f"{Path(source).stem}.md"
+    assert converted.exists()