test: add

spec/controllers/health_controller_spec.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe HealthController, type: :controller do
+  describe "GET #show" do
+    it "returns successful health check response" do
+      get :show
+
+      expect(response).to have_http_status(:success)
+    end
+
+    it "returns JSON with status ok" do
+      get :show
+
+      json_response = JSON.parse(response.body)
+      expect(json_response["status"]).to eq("ok")
+    end
+
+    it "includes timestamp in response" do
+      get :show
+
+      json_response = JSON.parse(response.body)
+      expect(json_response["timestamp"]).to be_present
+      expect { Time.iso8601(json_response["timestamp"]) }.not_to raise_error
+    end
+
+    it "includes Rails version in response" do
+      get :show
+
+      json_response = JSON.parse(response.body)
+      expect(json_response["version"]).to eq(Rails.version)
+    end
+
+    it "includes environment in response" do
+      get :show
+
+      json_response = JSON.parse(response.body)
+      expect(json_response["environment"]).to eq(Rails.env)
+    end
+  end
+end