Add utility to test specs individually

.gitlab-ci.yml

@@ -51,6 +51,11 @@ spec mocks:
   script:
     - crystal spec --error-on-warnings --junit_output=. spec/spectator/mocks/
 
+spec individual:
+  extends: spec
+  script:
+    - util/test-all-individually.sh
+
 format:
   script:
     - shards

util/test-all-individually.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -e
+
+find spec/ -type f -name \*_spec.cr -print0 | \
+  xargs -0 -n1 time crystal spec --error-on-warnings -v