dev-python/test: Add a virtual for Python "test" module

Add a virtual package that corresponds to the Python `test` stdlib
package.  It enforces either Python versions that install the `test`
package unconditionally, or the corresponding dev-python/python-tests
packages.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/test/metadata.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>python@gentoo.org</email>
+		<name>Python</name>
+	</maintainer>
+	<stabilize-allarches/>
+</pkgmetadata>

dev-python/test/test-0.ebuild

@@ -0,0 +1,45 @@
+# Copyright 2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( pypy3 python3_{10..13} )
+
+inherit python-r1
+
+DESCRIPTION="Virtual to install 'test' package from stdlib"
+HOMEPAGE="https://docs.python.org/3/library/test.html"
+
+LICENSE="metapackage"
+SLOT="0"
+KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86"
+REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+
+RDEPEND="
+	${PYTHON_DEPS}
+	$(python_gen_impl_dep 'test-install(+)' pypy3)
+	$(python_gen_cond_dep '
+		|| (
+			dev-python/python-tests:3.10
+			<dev-lang/python-3.10.14_p3-r1:3.10
+		)
+	' python3_10)
+	$(python_gen_cond_dep '
+		|| (
+			dev-python/python-tests:3.11
+			<dev-lang/python-3.11.9_p2-r1:3.11
+		)
+	' python3_11)
+	$(python_gen_cond_dep '
+		|| (
+			dev-python/python-tests:3.12
+			<dev-lang/python-3.12.5_p1-r1:3.12
+		)
+	' python3_12)
+	$(python_gen_cond_dep '
+		|| (
+			dev-python/python-tests:3.13
+			<dev-lang/python-3.13.0_rc1_p3-r1:3.13
+		)
+	' python3_13)
+"