Added gnome_battery_bench, the GNOME battery benchmarking tool, works fine.

sys-apps/gnome_battery_bench/Manifest

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+EBUILD gnome_battery_bench-9999.ebuild 1141 BLAKE2B b187de5ecf1fe55337cd445069febbcf13e4982fdabc1105998a1e53a8cd7bd975fad6b58798221903b9da72bbe090bd67dac3c8f4eb077ac3032c1441e62a0a SHA512 cd4d39c77729739de4d750f28b62917f1aef2a59ad6f70610505dd56cd583ba3874469184b8fd1748153554bbdcd84037184d4aede90a2be6fb0d681279ebb48

sys-apps/gnome_battery_bench/gnome_battery_bench-9999.ebuild

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+#By Kuratsune
+
+EAPI=6
+
+inherit autotools git-r3 linux-info xdg-utils
+
+DESCRIPTION="GNOME battery benchmark tool."
+HOMEPAGE="https://gitlab.gnome.org/GNOME/gnome-battery-bench"
+MY_AUTHOR="GNOEM team"
+EGIT_REPO_URI="https://gitlab.gnome.org/GNOME/gnome-battery-bench.git"
+
+EGIT_BRANCH="master"
+KEYWORDS=""
+
+
+LICENSE="GPL-2"
+SLOT="0"
+
+CONFIG_CHECK="
+            ~INPUT_UINPUT
+            "
+
+DEPEND=">=dev-libs/glib-2.0
+        virtual/libudev
+        x11-libs/libXtst
+        >=x11-libs/gtk+-3.0
+        dev-libs/json-glib
+        x11-libs/libXi
+        sys-auth/polkit
+        app-text/asciidoc
+        app-text/xmlto"
+
+RDEPEND=">=dev-libs/glib-2.0
+        virtual/libudev
+        x11-libs/libXtst
+        >=x11-libs/gtk+-3.0
+        dev-libs/json-glib
+        x11-libs/libXi
+        sys-auth/polkit"
+
+
+src_prepare() {
+	default
+	eautoreconf
+}
+
+pkg_post_install() {
+    xdg_desktop_database_update 
+    xdg_mimeinfo_database_update
+
+    einfo "uinput (user space input drivers) should be built-in your kernel, or the kernel module (uinput) should be loaded, or ${PN} will crash on startup. \"# modprobe uinput\" as root should do the trick."
+}