sys-devel/just: fix tests

Turns out portage doesn't export USER.

Closes: https://bugs.gentoo.org/890889
Signed-off-by: Joe Kappus <joe@wt.gd>

sys-devel/just/just-1.12.0.ebuild

@@ -133,6 +133,13 @@ RESTRICT="mirror"
 
 QA_FLAGS_IGNORED="usr/bin/just"
 
+src_test() {
+        # $USER must be set or tests fail Bug #890889
+        export USER=portage
+
+        default
+}
+
 src_install() {
 	local DOCS=( README.md )
 

sys-devel/just/just-1.13.0.ebuild

@@ -133,6 +133,13 @@ RESTRICT="mirror"
 
 QA_FLAGS_IGNORED="usr/bin/just"
 
+src_test() {
+        # $USER must be set or tests fail Bug #890889
+        export USER=portage
+
+        default
+}
+
 src_install() {
 	local DOCS=( README.md )