Add support for importing lists (#25203)

spec/fixtures/files/lists.csv

@@ -0,0 +1,3 @@
+Mastodon project,gargron@example.com
+Mastodon project,mastodon@example.com
+test,foo@example.com

spec/models/form/import_spec.rb

@@ -86,6 +86,7 @@ RSpec.describe Form::Import do
     it_behaves_like 'too many CSV rows', 'muting', 'imports.txt', 1
     it_behaves_like 'too many CSV rows', 'domain_blocking', 'domain_blocks.csv', 2
     it_behaves_like 'too many CSV rows', 'bookmarks', 'bookmark-imports.txt', 3
+    it_behaves_like 'too many CSV rows', 'lists', 'lists.csv', 2
 
     # Importing list of addresses with no headers into various types
     it_behaves_like 'valid import', 'following', 'imports.txt'
@@ -98,6 +99,9 @@ RSpec.describe Form::Import do
     # Importing bookmarks list with no headers into expected type
     it_behaves_like 'valid import', 'bookmarks', 'bookmark-imports.txt'
 
+    # Importing lists with no headers into expected type
+    it_behaves_like 'valid import', 'lists', 'lists.csv'
+
     # Importing followed accounts with headers into various compatible types
     it_behaves_like 'valid import', 'following', 'following_accounts.csv'
     it_behaves_like 'valid import', 'blocking', 'following_accounts.csv'
@@ -273,6 +277,12 @@ RSpec.describe Form::Import do
       { 'acct' => 'user@test.com', 'hide_notifications' => false },
     ]
 
+    it_behaves_like 'on successful import', 'lists', 'merge', 'lists.csv', [
+      { 'acct' => 'gargron@example.com', 'list_name' => 'Mastodon project' },
+      { 'acct' => 'mastodon@example.com', 'list_name' => 'Mastodon project' },
+      { 'acct' => 'foo@example.com', 'list_name' => 'test' },
+    ]
+
     # Based on the bug report 20571 where UTF-8 encoded domains were rejecting import of their users
     #
     # https://github.com/mastodon/mastodon/issues/20571

spec/services/bulk_import_row_service_spec.rb

@@ -91,5 +91,77 @@ RSpec.describe BulkImportRowService do
         end
       end
     end
+
+    context 'when importing a list row' do
+      let(:import_type) { 'lists' }
+      let(:target_account) { Fabricate(:account) }
+      let(:data) do
+        { 'acct' => target_account.acct, 'list_name' => 'my list' }
+      end
+
+      shared_examples 'common behavior' do
+        context 'when the target account is already followed' do
+          before do
+            account.follow!(target_account)
+          end
+
+          it 'returns true' do
+            expect(subject.call(import_row)).to be true
+          end
+
+          it 'adds the target account to the list' do
+            expect { subject.call(import_row) }.to change { ListAccount.joins(:list).exists?(account_id: target_account.id, list: { title: 'my list' }) }.from(false).to(true)
+          end
+        end
+
+        context 'when the user already requested to follow the target account' do
+          before do
+            account.request_follow!(target_account)
+          end
+
+          it 'returns true' do
+            expect(subject.call(import_row)).to be true
+          end
+
+          it 'adds the target account to the list' do
+            expect { subject.call(import_row) }.to change { ListAccount.joins(:list).exists?(account_id: target_account.id, list: { title: 'my list' }) }.from(false).to(true)
+          end
+        end
+
+        context 'when the target account is neither followed nor requested' do
+          it 'returns true' do
+            expect(subject.call(import_row)).to be true
+          end
+
+          it 'adds the target account to the list' do
+            expect { subject.call(import_row) }.to change { ListAccount.joins(:list).exists?(account_id: target_account.id, list: { title: 'my list' }) }.from(false).to(true)
+          end
+        end
+
+        context 'when the target account is the user themself' do
+          let(:target_account) { account }
+
+          it 'returns true' do
+            expect(subject.call(import_row)).to be true
+          end
+
+          it 'adds the target account to the list' do
+            expect { subject.call(import_row) }.to change { ListAccount.joins(:list).exists?(account_id: target_account.id, list: { title: 'my list' }) }.from(false).to(true)
+          end
+        end
+      end
+
+      context 'when the list does not exist yet' do
+        include_examples 'common behavior'
+      end
+
+      context 'when the list exists' do
+        before do
+          Fabricate(:list, account: account, title: 'my list')
+        end
+
+        include_examples 'common behavior'
+      end
+    end
   end
 end