Cover Export more (#3840)

spec/fabricators/media_attachment_fabricator.rb

 Fabricator(:media_attachment) do
   account
+  file { [attachment_fixture(['attachment.gif', 'attachment.jpg', 'attachment.webm'].sample), nil].sample }
 end

spec/models/export_spec.rb

 require 'rails_helper'
 
 describe Export do
-  describe 'to_csv' do
-    before do
-      one = Account.new(username: 'one', domain: 'local.host')
-      two = Account.new(username: 'two', domain: 'local.host')
-      accounts = [one, two]
-
-      @account = double(blocking: accounts, muting: accounts, following: accounts)
-    end
+  let(:account) { Fabricate(:account) }
+  let(:target_accounts) do
+    [ {}, { username: 'one', domain: 'local.host' } ].map(&method(:Fabricate).curry(2).call(:account))
+  end
 
+  describe 'to_csv' do
     it 'returns a csv of the blocked accounts' do
-      export = Export.new(@account).to_blocked_accounts_csv
+      target_accounts.each(&account.method(:block!))
+
+      export = Export.new(account).to_blocked_accounts_csv
       results = export.strip.split
 
       expect(results.size).to eq 2
@@ -19,7 +18,9 @@ describe Export do
     end
 
     it 'returns a csv of the muted accounts' do
-      export = Export.new(@account).to_muted_accounts_csv
+      target_accounts.each(&account.method(:mute!))
+
+      export = Export.new(account).to_muted_accounts_csv
       results = export.strip.split
 
       expect(results.size).to eq 2
@@ -27,11 +28,37 @@ describe Export do
     end
 
     it 'returns a csv of the following accounts' do
-      export = Export.new(@account).to_following_accounts_csv
+      target_accounts.each(&account.method(:follow!))
+
+      export = Export.new(account).to_following_accounts_csv
       results = export.strip.split
 
       expect(results.size).to eq 2
       expect(results.first).to eq 'one@local.host'
     end
   end
+
+  describe 'total_storage' do
+    it 'returns the total size of the media attachments' do
+      media_attachment = Fabricate(:media_attachment, account: account)
+      expect(Export.new(account).total_storage).to eq media_attachment.file_file_size || 0
+    end
+  end
+
+  describe 'total_follows' do
+    it 'returns the total number of the followed accounts' do
+      target_accounts.each(&account.method(:follow!))
+      expect(Export.new(account).total_follows).to eq 2
+    end
+
+    it 'returns the total number of the blocked accounts' do
+      target_accounts.each(&account.method(:block!))
+      expect(Export.new(account).total_blocks).to eq 2
+    end
+
+    it 'returns the total number of the muted accounts' do
+      target_accounts.each(&account.method(:mute!))
+      expect(Export.new(account).total_mutes).to eq 2
+    end
+  end
 end