pandas-dev · zkrolikowski-vl · Jan 24, 2022 · Jan 25, 2022 · Jan 25, 2022 · Jan 26, 2022
diff --git a/LICENSES/STUBS_LICENSE b/LICENSES/STUBS_LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) Virtus Lab sp. z o.o. (Ltd.)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/pandas/tests/typing/README.md b/pandas/tests/typing/README.md
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+## Purpose of those tests
+
+The tests contained in the `valid` directory are snippets that when
+process through a type checker ensure that type annotations and type
+stubs from this repository conform to common pandas API use-patterns.
+
+## Running the tests
+
+Tests can be run in following ways:
+
+`pyright pandas/tests/typing`
+
+`mypy pandas/tests/typing`
+
+They'll also be automatically detected and executed by pytest. This
+is to ensure that the test code itself is valid.
+
+## Developing the tests
+
+Some tests contain type checker ignore-instructions along with an
+error that's supposed to be thrown.
+
+    # error: No overload variant of "to_datetime" matches argument type "DataFrame"
+    pd.to_datetime(df)  # type: ignore[call-overload]
+
+All such constructs are placed because of the missing/invalid API
+type information. When the API signature becomes valid again type
+checker will ask you to remove `type: ignore`. Please remove the
+above comment as well.
+
+When adding new tests please use the above solution as well.
+
+## Origins and attribution
+
+The tests come from the [pandas-stubs](https://github.com/VirtusLab/pandas-stubs)
+repository originally released under the MIT license.
diff --git a/pandas/tests/typing/__init__.py b/pandas/tests/typing/__init__.py
diff --git a/pandas/tests/typing/valid/__init__.py b/pandas/tests/typing/valid/__init__.py