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"""Tests for making sure experimental imports work as expected."""
import textwrap
import pytest
from sklearn.utils import _IS_WASM
from sklearn.utils._testing import assert_run_python_script_without_output
@pytest.mark.xfail(_IS_WASM, reason="cannot start subprocess")
def test_imports_strategies():
# Make sure different import strategies work or fail as expected.
# Since Python caches the imported modules, we need to run a child process
# for every test case. Else, the tests would not be independent
# (manually removing the imports from the cache (sys.modules) is not
# recommended and can lead to many complications).
pattern = "IterativeImputer is experimental"
good_import = """
from sklearn.experimental import enable_iterative_imputer
from sklearn.impute import IterativeImputer
"""
assert_run_python_script_without_output(
textwrap.dedent(good_import), pattern=pattern
)
good_import_with_ensemble_first = """
import sklearn.ensemble
from sklearn.experimental import enable_iterative_imputer
from sklearn.impute import IterativeImputer
"""
assert_run_python_script_without_output(
textwrap.dedent(good_import_with_ensemble_first),
pattern=pattern,
)
bad_imports = f"""
import pytest
with pytest.raises(ImportError, match={pattern!r}):
from sklearn.impute import IterativeImputer
import sklearn.experimental
with pytest.raises(ImportError, match={pattern!r}):
from sklearn.impute import IterativeImputer
"""
assert_run_python_script_without_output(
textwrap.dedent(bad_imports),
pattern=pattern,
)
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