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Diffstat (limited to 'src/arrow/python/pyarrow/tests/test_builder.py')
-rw-r--r-- | src/arrow/python/pyarrow/tests/test_builder.py | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/arrow/python/pyarrow/tests/test_builder.py b/src/arrow/python/pyarrow/tests/test_builder.py new file mode 100644 index 000000000..50d801026 --- /dev/null +++ b/src/arrow/python/pyarrow/tests/test_builder.py @@ -0,0 +1,67 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +import weakref + +import numpy as np + +import pyarrow as pa +from pyarrow.lib import StringBuilder + + +def test_weakref(): + sbuilder = StringBuilder() + wr = weakref.ref(sbuilder) + assert wr() is not None + del sbuilder + assert wr() is None + + +def test_string_builder_append(): + sbuilder = StringBuilder() + sbuilder.append(b"a byte string") + sbuilder.append("a string") + sbuilder.append(np.nan) + sbuilder.append(None) + assert len(sbuilder) == 4 + assert sbuilder.null_count == 2 + arr = sbuilder.finish() + assert len(sbuilder) == 0 + assert isinstance(arr, pa.Array) + assert arr.null_count == 2 + assert arr.type == 'str' + expected = ["a byte string", "a string", None, None] + assert arr.to_pylist() == expected + + +def test_string_builder_append_values(): + sbuilder = StringBuilder() + sbuilder.append_values([np.nan, None, "text", None, "other text"]) + assert sbuilder.null_count == 3 + arr = sbuilder.finish() + assert arr.null_count == 3 + expected = [None, None, "text", None, "other text"] + assert arr.to_pylist() == expected + + +def test_string_builder_append_after_finish(): + sbuilder = StringBuilder() + sbuilder.append_values([np.nan, None, "text", None, "other text"]) + arr = sbuilder.finish() + sbuilder.append("No effect") + expected = [None, None, "text", None, "other text"] + assert arr.to_pylist() == expected |