WIP: Spike using a matrix

.github/workflows/ci.yml

@@ -41,6 +41,16 @@ jobs:
   tests:
     name: Tests
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # Set N number of parallel jobs you want to run tests on.
+        # Use higher number if you have slow tests to split them on more parallel jobs.
+        # Remember to update ci_node_index below to 0..N-1
+        ci_node_total: [4]
+        # set N-1 indexes for parallel jobs
+        # When you run 2 parallel jobs then first job will have index 0, the second job will have index 1 etc
+        ci_node_index: [0, 1, 2, 3]
     services:
       postgres:
         image: postgres:15.7
@@ -96,4 +106,4 @@ jobs:
           RAILS_ENV: test
           POSTGRES_USERNAME: postgres
           POSTGRES_PASSWORD: postgres
-        run: bundle exec rake parallel:spec
+        run: ./bin/ci_spec

bin/ci_spec

@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+# This script is used to run tests in parallel in Github Actions.
+# parallel_test test -n 8 --only-group 1,2
+
+CI_RUNNER_PROCESS_COUNT = 2
+
+parallel_tests_is_one_indexed = 1
+node_index = ENV['CI_NODE_INDEX'].to_i
+
+groups = "#{node_index * CI_RUNNER_PROCESS_COUNT + parallel_tests_is_one_indexed },#{node_index * CI_RUNNER_PROCESS_COUNT + parallel_tests_is_one_indexed + 1}"
+
+total_parallelism = CI_RUNNER_PROCESS_COUNT * ENV['CI_NODE_TOTAL'].to_i
+
+exec "bundle exec parallel_test ./spec -t rspec -n #{total_parallelism} --only-group #{groups}"