POETRY_EXPERIMENTAL_NEW_INSTALLER is interpreted as a boolean

src/poetry/config/config.py

@@ -132,6 +132,7 @@ def _get_normalizer(self, name: str) -> Callable:
             "virtualenvs.in-project",
             "virtualenvs.options.always-copy",
             "virtualenvs.options.system-site-packages",
+            "experimental.new-installer",
             "installer.parallel",
         }:
             return boolean_normalizer

tests/config/test_config.py

@@ -1,7 +1,22 @@
 import os
+import re
 
 import pytest
 
+from poetry.config.config import Config
+
+
+def get_boolean_options(config=None):
+    if config is None:
+        config = Config.default_config
+
+    for k, v in config.items():
+        if isinstance(v, bool) or v is None:
+            yield k
+        if isinstance(v, dict):
+            for suboption in get_boolean_options(v):
+                yield "{}.{}".format(k, suboption)
+
 
 @pytest.mark.parametrize(
     ("name", "value"), [("installer.parallel", True), ("virtualenvs.create", True)]
@@ -14,16 +29,19 @@ def test_config_get_processes_depended_on_values(config, config_cache_dir):
     assert str(config_cache_dir / "virtualenvs") == config.get("virtualenvs.path")
 
 
+def generate_environment_variable_tests():
+    for env_value, value in [("true", True), ("false", False)]:
+        for name in get_boolean_options():
+            env_var = "POETRY_{}".format(re.sub("[.-]+", "_", name).upper())
+            yield (name, env_var, env_value, value)
+
+
 @pytest.mark.parametrize(
-    ("name", "env_value", "value"),
-    [
-        ("installer.parallel", "true", True),
-        ("installer.parallel", "false", False),
-        ("virtualenvs.create", "true", True),
-        ("virtualenvs.create", "false", False),
-    ],
+    ("name", "env_var", "env_value", "value"),
+    list(generate_environment_variable_tests()),
 )
-def test_config_get_from_environment_variable(config, environ, name, env_value, value):
-    env_var = "POETRY_{}".format("_".join(k.upper() for k in name.split(".")))
+def test_config_get_from_environment_variable(
+    config, environ, name, env_var, env_value, value
+):
     os.environ[env_var] = env_value
     assert config.get(name) is value