Add integration tests for [tool.maturin.include] and `[tool.maturin…

….exclude]`

test-crates/pyo3-mixed-include-exclude/.gitignore

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+include_this_file

test-crates/pyo3-mixed-include-exclude/Cargo.toml

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+[package]
+authors = []
+name = "pyo3-mixed-include-exclude"
+version = "2.1.3"
+description = "Implements a dummy function combining rust and python"
+edition = "2021"
+
+[dependencies]
+pyo3 = { version = "0.17.3", features = [
+  "extension-module",
+  "generate-import-lib",
+] }
+
+[lib]
+name = "pyo3_mixed"
+crate-type = ["cdylib"]

test-crates/pyo3-mixed-include-exclude/README.md

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+# pyo3-mixed-include-exclude
+
+A package for testing maturin with a mixed pyo3/python project with include and exclude configurations.
+
+## Usage
+
+```bash
+pip install .
+```
+
+```python
+import pyo3_mixed_include_exclude
+assert pyo3_mixed_include_exclude.get_42() == 42
+```
+
+## Testing
+
+Install tox:
+
+```bash
+pip install tox
+```
+
+Run it:
+
+```bash
+tox
+```
+
+The tests are in `test_pyo3_mixed_include_exclude.py`, while the configuration is in tox.ini

test-crates/pyo3-mixed-include-exclude/check_installed/check_installed.py

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+#!/usr/bin/env python3
+
+from boltons.strutils import slugify
+import pyo3_mixed_include_exclude
+
+assert pyo3_mixed_include_exclude.get_42() == 42
+assert slugify("First post! Hi!!!!~1    ") == "first_post_hi_1"
+
+print("SUCCESS")

test-crates/pyo3-mixed-include-exclude/pyo3-config.txt

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+implementation=CPython
+version=3.10
+shared=true
+abi3=false
+suppress_build_script_link_lines=false
+pointer_width=64

test-crates/pyo3-mixed-include-exclude/pyo3_mixed_include_exclude/__init__.py

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+from .python_module.double import double
+from .pyo3_mixed_include_exclude import get_21
+
+
+def get_42() -> int:
+    return double(get_21)

test-crates/pyo3-mixed-include-exclude/pyo3_mixed_include_exclude/python_module/double.py

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+from typing import Callable
+
+
+def double(fn: Callable[[], int]) -> int:
+    return 2 * fn()

test-crates/pyo3-mixed-include-exclude/pyproject.toml

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+[build-system]
+requires = ["maturin>=0.13,<0.14"]
+build-backend = "maturin"
+
+[project]
+name = "pyo3-mixed-include-exclude"
+classifiers = ["Programming Language :: Python", "Programming Language :: Rust"]
+requires-python = ">=3.7"
+dependencies = ["boltons"]
+
+[project.scripts]
+get_42 = "pyo3_mixed:get_42"
+
+[tool.maturin]
+include = ["include_this_file", "missing"]
+exclude = ["exclude_this_file", "tests/**/*", ".gitignore", "unused"]