Modernize the specfile and run all tests

Use pyproject macros:

- Use `%pyproject_check_import` instead of manually calling `python -c`.

- The conditional setuptools_scm stuff can be removed.
  python-setuptools_scm is now part of RHEL.

Run all tests:

- Always run pytest unit tests
- Run all integration tests instead of just examples/hello-world.

Formatting:

- Two lines between specfile settings
- Make `%description`s DRY.

python-setuptools-rust.spec

@@ -1,8 +1,10 @@
-%if 0%{?rhel}
-%bcond_with tests
-%else
-%bcond_without tests
-%endif
+# RHEL does not have packaged rust libraries
+%bcond packaged_rust_libraries %{undefined rhel}
+# The integration tests depend on the presence of these libraries
+%bcond integration_tests %{with packaged_rust_libraries}
+# Regex of integration tests to skip.
+#  * html-py-ever requires unpackaged rust crates
+%global integration_tests_exc '^(html-py-ever)'
 
 Name:           python-setuptools-rust
 Version:        1.7.0
@@ -15,19 +17,24 @@ Source0:        %{pypi_source setuptools-rust}
 BuildArch:      noarch
 
 BuildRequires:  python3-devel
+BuildRequires:  %{py3_dist pytest}
 %if 0%{?fedora}
 BuildRequires:  rust-packaging
 %else
 # RHEL has rust-toolset and neither setuptools-scm nor wheel
 BuildRequires:  rust-toolset >= 1.45
 %endif
-%if %{with tests}
-BuildRequires:  rust-pyo3+default-devel
+%if %{with integration_tests}
+BuildRequires:  %{py3_dist cffi}
 %endif
 
-%description
+
+%global _description %{expand:
 Setuptools helpers for Rust Python extensions. Compile and distribute Python
-extensions written in Rust as easily as if they were written in C.
+extensions written in Rust as easily as if they were written in C.}
+
+%description %{_description}
+
 
 %package -n     python3-setuptools-rust
 Summary:        %{summary}
@@ -37,44 +44,81 @@ Requires:       rust-packaging
 Requires:       rust-toolset >= 1.45
 %endif
 
-%description -n python3-setuptools-rust
-Setuptools helpers for Rust Python extensions. Compile and distribute Python
-extensions written in Rust as easily as if they were written in C.
+%description -n python3-setuptools-rust %{_description}
+
 
 %prep
 %autosetup -n setuptools-rust-%{version}
-# Remove bundled egg-info
-rm -rf setuptools-rust.egg-info
 
-%if ! 0%{?fedora}
-# RHEL doesn't have setuptools-scm, releases come with version.py
-sed 's/"setuptools_scm"//' pyproject.toml
+%cargo_prep
+
+%if %{with integration_tests}
+for example in $(ls examples/ | grep -vE %{integration_tests_exc}); do
+    cd "examples/${example}"
+    %cargo_prep
+    cd -
+done
 %endif
 
+
 %generate_buildrequires
 %pyproject_buildrequires
+%if %{with integration_tests}
+for example in $(ls examples/ | grep -vE %{integration_tests_exc}); do
+    cd "examples/${example}"
+    %cargo_generate_buildrequires
+    cd - >&2
+done
+%endif
+
 
 %build
 %pyproject_wheel
 
+
 %install
 %pyproject_install
 %pyproject_save_files setuptools_rust
 
-%check
-PYTHONPATH=%{buildroot}%{python3_sitelib} \
-    %{__python3} -c "from setuptools_rust import RustExtension, version"
 
-%if %{with tests}
-cd examples/hello-world-setuppy
-%cargo_prep
-PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} setup.py build
-cd ../..
+%check
+%pyproject_check_import
+# Disable tests that require internet access and/or test Windows functionality
+%global test_ignores %{shrink:
+        not test_adjusted_local_rust_target_windows_msvc
+    and not test_get_lib_name_namespace_package
+}
+
+%if %{without packaged_rust_libraries}
+%global test_ignores %{shrink:%{test_ignores}
+    and not test_metadata_contents
+    and not test_metadata_cargo_log
+}
 %endif
 
+%pytest tests/ setuptools_rust/ --import-mode importlib -k '%{test_ignores}'
+
+%if %{with integration_tests}
+export PYTHONPATH=%{buildroot}%{python3_sitelib}
+for example in $(ls examples/ | grep -vE %{integration_tests_exc}); do
+    cd "examples/${example}"
+    %{python3} -c 'from setuptools.build_meta import build_wheel; build_wheel("dist")'
+    if [ -d "tests/" ]; then
+        %{python3} -m venv venv --system-site-packages
+        . ./venv/bin/activate
+        pip install dist/*.whl
+        python -Pm pytest tests/
+        deactivate
+    fi
+    cd -
+done
+%endif
+
+
 %files -n python3-setuptools-rust -f %{pyproject_files}
 %doc README.md CHANGELOG.md
 %license LICENSE
 
+
 %changelog
 %autochangelog