test: ensure env vars updated

See toolshed/abra#723

tests/integration/app_deploy.bats

@@ -577,3 +577,27 @@ teardown(){
   assert_success
   refute_output --partial "IMAGES"
 }
+
+# bats test_tags=slow
+@test "re-deploy updates existing env vars" {
+  run $ABRA app deploy "$TEST_APP_DOMAIN" --no-input
+  assert_success
+
+  run docker inspect --format='{{range .Config.Env}}{{println .}}{{end}}' \
+    $(docker ps -f name="$TEST_APP_DOMAIN_$TEST_SERVER" -q)
+  assert_success
+  assert_output --partial "WITH_COMMENT=foo"
+
+  run sed -i 's/WITH_COMMENT=foo/WITH_COMMENT=bar/g' \
+    "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env"
+  assert_success
+
+  run $ABRA app deploy "$TEST_APP_DOMAIN" --no-input --force
+  assert_success
+
+  run docker inspect --format='{{range .Config.Env}}{{println .}}{{end}}' \
+    $(docker ps -f name="$TEST_APP_DOMAIN_$TEST_SERVER" -q)
+  assert_success
+  refute_output --partial "WITH_COMMENT=foo"
+  assert_output --partial "WITH_COMMENT=bar"
+}