fix(nodeenv): replace leftover debug print with logger.debug

The debug print in _get_last_node_version() leaked a dict to stdout on
every version detection (default run, --node=latest, --node=lts), which
breaks output formatting for tools wrapping nodeenv. fixes #390

Author: ekalinin

nodeenv.py

@@ -1058,7 +1058,9 @@ def _get_last_node_version(lts=False):
     """
     Return last node.js version matching the filter
     """
-    print({"x86": is_x86_64_musl(), "risc": is_riscv64(), "lts": lts})
+    logger.debug(
+        ' * Host platform: x86_64-musl=%s, riscv64=%s, lts=%s',
+        is_x86_64_musl(), is_riscv64(), lts)
 
     def version_filter(v):
         if lts and not v['lts']:

tests/nodeenv_test.py

@@ -190,6 +190,12 @@ def test_get_lts_node_version_riscv64():
     assert nodeenv.get_last_lts_node_version() == '12.13.1'
 
 
+@pytest.mark.usefixtures('mock_index_json', 'mock_host_platform')
+def test_get_last_node_version_writes_nothing_to_stdout(capsys):
+    nodeenv.get_last_stable_node_version()
+    assert capsys.readouterr().out == ''
+
+
 def test__download_node_file():
     with mock.patch.object(nodeenv, 'urlopen') as m_urlopen:
         m_urlopen.side_effect = IncompleteRead("dummy")