dev-python/subprocess-tee: make it possible to run heavy tests

Signed-off-by: Marek Szuba <marecki@gentoo.org>

dev-python/subprocess-tee/metadata.xml

@@ -10,4 +10,11 @@
 		<remote-id type="github">pycontribs/subprocess-tee</remote-id>
 		<remote-id type="pypi">subprocess-tee</remote-id>
 	</upstream>
+	<use>
+		<flag name="test-full">
+			Enable full test mode. Pulls in many additional dependencies,
+			and requires having been emerged without this flag first
+			in order to avoid a circular dependency.
+		</flag>
+	</use>
 </pkgmetadata>

dev-python/subprocess-tee/subprocess-tee-0.3.4.ebuild

@@ -14,20 +14,21 @@ SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64"
+IUSE="test-full"
 
+REQUIRED_USE="test-full? ( test )"
+
+# ansible-molecule is invoked as an executable so no need for PYTHON_USEDEP
 BDEPEND="dev-python/setuptools_scm[${PYTHON_USEDEP}]
 	dev-python/setuptools_scm_git_archive[${PYTHON_USEDEP}]
 	test? (
 		$(python_gen_cond_dep '
 			dev-python/enrich[${PYTHON_USEDEP}]
 		' python3_{8,9})
+		test-full? ( app-admin/ansible-molecule )
 	)"
 
 distutils_enable_tests pytest
-# Depends on app-admin/ansible-molecule, which pulls in A LOT of other
-# ebuilds - including subprocess-tee itself. Too much trouble for a single
-# test if you ask me.
-EPYTEST_DESELECT=( "src/${PN/-/_}/test/test_func.py::test_molecule" )
 
 # dev-python/{,en}rich ebuilds do not support python3_10 yet.
 # We test fine (modulo some deprecation warnings) against 3.10 under tox, though.
@@ -36,5 +37,8 @@ python_test() {
 		ewarn "Skipping tests for ${EPYTHON} due to missing dependencies"
 		return 0
 	fi
+	if ! use test-full; then
+		local -x EPYTEST_DESELECT=( "src/${PN/-/_}/test/test_func.py::test_molecule" )
+	fi
 	distutils-r1_python_test
 }