dev-python/typed-ast: Fix running tests

Closes: https://bugs.gentoo.org/774975
Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/typed-ast/typed-ast-1.4.2.ebuild

@@ -3,19 +3,21 @@
 
 EAPI=7
 
-PYTHON_COMPAT=( python3_{7,8,9} )
+PYTHON_COMPAT=( python3_{7..9} )
 inherit distutils-r1
 
 DESCRIPTION="Python typed-ast backported"
 HOMEPAGE="https://pypi.org/project/typed-ast/ https://github.com/python/typed_ast"
 SRC_URI="mirror://pypi/${PN:0:1}/${PN/-/_}/${P/-/_}.tar.gz"
+S="${WORKDIR}/${P/-/_}"
 
 LICENSE="Apache-2.0 MIT"
 SLOT="0"
 KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~mips ppc ppc64 ~riscv sparc x86 ~x64-macos"
 
-DEPEND="dev-python/setuptools[${PYTHON_USEDEP}]"
-
-S="${WORKDIR}/${P/-/_}"
-
 distutils_enable_tests pytest
+
+python_test() {
+	cd "${BUILD_DIR}" || die
+	epytest
+}