Add coverage for ListAccount follow/follow_request set up (#31896)

spec/models/list_account_spec.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ListAccount do
+  describe 'Callbacks to set follows' do
+    context 'when list owner follows account' do
+      let!(:follow) { Fabricate :follow }
+      let(:list) { Fabricate :list, account: follow.account }
+
+      it 'finds and sets the follow with the list account' do
+        list_account = described_class.create list: list, account: follow.target_account
+        expect(list_account)
+          .to have_attributes(
+            follow: eq(follow),
+            follow_request: be_nil
+          )
+      end
+    end
+
+    context 'when list owner has a follow request for account' do
+      let!(:follow_request) { Fabricate :follow_request }
+      let(:list) { Fabricate :list, account: follow_request.account }
+
+      it 'finds and sets the follow request with the list account' do
+        list_account = described_class.create list: list, account: follow_request.target_account
+        expect(list_account)
+          .to have_attributes(
+            follow: be_nil,
+            follow_request: eq(follow_request)
+          )
+      end
+    end
+
+    context 'when list owner is the account' do
+      let(:list) { Fabricate :list  }
+
+      it 'does not set follow or follow request' do
+        list_account = described_class.create list: list, account: list.account
+        expect(list_account)
+          .to have_attributes(
+            follow: be_nil,
+            follow_request: be_nil
+          )
+      end
+    end
+  end
+end