Avoid testing conflicts with 2 diff users

.github/workflows/main.yml

@@ -24,7 +24,7 @@ jobs:
           bundler-cache: true
 
       - name: Run tests
-        run: PARALLEL_WORKERS=1 bundle exec rails test
+        run: bundle exec rails test
 
       - name: Save AppMaps
         uses: actions/cache/save@v3

test/integration/billing_address_test.rb

@@ -2,7 +2,8 @@
 
 class BillingAddressTest < ActionDispatch::IntegrationTest
   def setup
-    @user = users(:michael)
+    @michael = users(:michael)
+    @archer = users(:archer)
     DatabaseCleaner.strategy = :deletion
     DatabaseCleaner.start
   end
@@ -12,40 +13,42 @@ def setup
     DatabaseCleaner.clean
   end
 
-  test "create new billing address" do
-    get billing_user_path(@user)
+  test "create new billing address as michael" do
+    user = @michael
+    get billing_user_path(user)
     assert_template 'users/billing'
 
-    patch billing_user_path(@user), params: { billing: { address: "123 Main Street", city: "Sample City", state: "SC", zip_code: "12345" } }
+    patch billing_user_path(user), params: { billing: { address: "123 Main Street", city: "Sample City", state: "SC", zip_code: "12345" } }
 
-    assert_redirected_to billing_user_path(@user)
+    assert_redirected_to billing_user_path(user)
     follow_redirect!
     assert_match "Billing address updated", response.body
-    @user.reload
-    user_billing = UserBilling.find_by(user_id: @user.id)
+    user.reload
+    user_billing = UserBilling.find_by(user_id: user.id)
     assert_not_nil user_billing
     assert_equal "123 Main Street", user_billing.address
     assert_equal "Sample City", user_billing.city
     assert_equal "SC", user_billing.state
     assert_equal "12345", user_billing.zip_code
   end
 
-  test "update existing billing address" do
+  test "update existing billing address as archer" do
+    user = @archer
     # Ensure a billing address exists before this test
-    UserBilling.create(user_id: @user.id, address: "Initial Address", city: "Initial City", state: "Initial State", zip_code: "00000")
+    UserBilling.create(user_id: user.id, address: "Initial Address", city: "Initial City", state: "Initial State", zip_code: "00000")
 
-    get billing_user_path(@user)
+    get billing_user_path(user)
     assert_template 'users/billing'
 
-    patch billing_user_path(@user), params: { billing: { address: "456 Another St", city: "Updated City", state: "UC", zip_code: "67890" } }
+    patch billing_user_path(user), params: { billing: { address: "456 Another St", city: "Updated City", state: "UC", zip_code: "67890" } }
 
-    assert_redirected_to billing_user_path(@user)
+    assert_redirected_to billing_user_path(user)
     follow_redirect!
     assert_match "Billing address updated", response.body
 
     # Verify the attributes are updated
-    @user.reload
-    user_billing = UserBilling.find_by(user_id: @user.id)
+    user.reload
+    user_billing = UserBilling.find_by(user_id: user.id)
     assert_not_nil user_billing
     assert_equal "456 Another St", user_billing.address
     assert_equal "Updated City", user_billing.city