Fix RSpec/VerifiedDoubles cop (#25469)

spec/models/account/field_spec.rb

@@ -6,7 +6,7 @@ RSpec.describe Account::Field do
   describe '#verified?' do
     subject { described_class.new(account, 'name' => 'Foo', 'value' => 'Bar', 'verified_at' => verified_at) }
 
-    let(:account) { double('Account', local?: true) }
+    let(:account) { instance_double(Account, local?: true) }
 
     context 'when verified_at is set' do
       let(:verified_at) { Time.now.utc.iso8601 }
@@ -28,7 +28,7 @@ RSpec.describe Account::Field do
   describe '#mark_verified!' do
     subject { described_class.new(account, original_hash) }
 
-    let(:account) { double('Account', local?: true) }
+    let(:account) { instance_double(Account, local?: true) }
     let(:original_hash) { { 'name' => 'Foo', 'value' => 'Bar' } }
 
     before do
@@ -47,7 +47,7 @@ RSpec.describe Account::Field do
   describe '#verifiable?' do
     subject { described_class.new(account, 'name' => 'Foo', 'value' => value) }
 
-    let(:account) { double('Account', local?: local) }
+    let(:account) { instance_double(Account, local?: local) }
 
     context 'with local accounts' do
       let(:local) { true }

spec/models/account_migration_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe AccountMigration do
       before do
         target_account.aliases.create!(acct: source_account.acct)
 
-        service_double = double
+        service_double = instance_double(ResolveAccountService)
         allow(ResolveAccountService).to receive(:new).and_return(service_double)
         allow(service_double).to receive(:call).with(target_acct, anything).and_return(target_account)
       end
@@ -29,7 +29,7 @@ RSpec.describe AccountMigration do
       let(:target_acct) { 'target@remote' }
 
       before do
-        service_double = double
+        service_double = instance_double(ResolveAccountService)
         allow(ResolveAccountService).to receive(:new).and_return(service_double)
         allow(service_double).to receive(:call).with(target_acct, anything).and_return(nil)
       end

spec/models/session_activation_spec.rb

@@ -16,7 +16,7 @@ RSpec.describe SessionActivation do
       allow(session_activation).to receive(:detection).and_return(detection)
     end
 
-    let(:detection)          { double(id: 1) }
+    let(:detection)          { instance_double(Browser::Chrome, id: 1) }
     let(:session_activation) { Fabricate(:session_activation) }
 
     it 'returns detection.id' do
@@ -30,7 +30,7 @@ RSpec.describe SessionActivation do
     end
 
     let(:session_activation) { Fabricate(:session_activation) }
-    let(:detection)          { double(platform: double(id: 1)) }
+    let(:detection)          { instance_double(Browser::Chrome, platform: instance_double(Browser::Platform, id: 1)) }
 
     it 'returns detection.platform.id' do
       expect(session_activation.platform).to be 1

spec/models/setting_spec.rb

@@ -62,7 +62,7 @@ RSpec.describe Setting do
 
         context 'when RailsSettings::Settings.object returns truthy' do
           let(:object) { db_val }
-          let(:db_val) { double(value: 'db_val') }
+          let(:db_val) { instance_double(described_class, value: 'db_val') }
 
           context 'when default_value is a Hash' do
             let(:default_value) { { default_value: 'default_value' } }