Fix constant leaking to subsequent tests

We use an anonymous class so that we don't have to define a new constant

spec/models/concerns/bulk_insert_safe_spec.rb

@@ -3,56 +3,6 @@
 require 'spec_helper'
 
 RSpec.describe BulkInsertSafe do
-  class BulkInsertItem < ActiveRecord::Base
-    include BulkInsertSafe
-    include ShaAttribute
-
-    validates :name, :enum_value, :secret_value, :sha_value, :jsonb_value, presence: true
-
-    ENUM_VALUES = {
-      case_1: 1
-    }.freeze
-
-    sha_attribute :sha_value
-
-    enum enum_value: ENUM_VALUES
-
-    attr_encrypted :secret_value,
-      mode: :per_attribute_iv,
-      algorithm: 'aes-256-gcm',
-      key: Settings.attr_encrypted_db_key_base_32,
-      insecure_mode: false
-
-    default_value_for :enum_value, 'case_1'
-    default_value_for :secret_value, 'my-secret'
-    default_value_for :sha_value, '2fd4e1c67a2d28fced849ee1bb76e7391b93eb12'
-    default_value_for :jsonb_value, { "key" => "value" }
-
-    def self.valid_list(count)
-      Array.new(count) { |n| new(name: "item-#{n}") }
-    end
-
-    def self.invalid_list(count)
-      Array.new(count) { new }
-    end
-  end
-
-  module InheritedUnsafeMethods
-    extend ActiveSupport::Concern
-
-    included do
-      after_save -> { "unsafe" }
-    end
-  end
-
-  module InheritedSafeMethods
-    extend ActiveSupport::Concern
-
-    included do
-      after_initialize -> { "safe" }
-    end
-  end
-
   before(:all) do
     ActiveRecord::Schema.define do
       create_table :bulk_insert_items, force: true do |t|
@@ -66,100 +16,155 @@ RSpec.describe BulkInsertSafe do
         t.index :name, unique: true
       end
     end
-
-    BulkInsertItem.reset_column_information
   end
 
   after(:all) do
     ActiveRecord::Schema.define do
       drop_table :bulk_insert_items, force: true
     end
+  end
+
+  let_it_be(:bulk_insert_item_class) do
+    Class.new(ActiveRecord::Base) do
+      self.table_name = 'bulk_insert_items'
 
-    BulkInsertItem.reset_column_information
+      include BulkInsertSafe
+      include ShaAttribute
+
+      validates :name, :enum_value, :secret_value, :sha_value, :jsonb_value, presence: true
+
+      sha_attribute :sha_value
+
+      enum enum_value: { case_1: 1 }
+
+      attr_encrypted :secret_value,
+        mode: :per_attribute_iv,
+        algorithm: 'aes-256-gcm',
+        key: Settings.attr_encrypted_db_key_base_32,
+        insecure_mode: false
+
+      default_value_for :enum_value, 'case_1'
+      default_value_for :secret_value, 'my-secret'
+      default_value_for :sha_value, '2fd4e1c67a2d28fced849ee1bb76e7391b93eb12'
+      default_value_for :jsonb_value, { "key" => "value" }
+
+      def self.name
+        'BulkInsertItem'
+      end
+
+      def self.valid_list(count)
+        Array.new(count) { |n| new(name: "item-#{n}") }
+      end
+
+      def self.invalid_list(count)
+        Array.new(count) { new }
+      end
+    end
   end
 
-  describe BulkInsertItem do
-    it_behaves_like 'a BulkInsertSafe model', described_class do
-      let(:valid_items_for_bulk_insertion) { described_class.valid_list(10) }
-      let(:invalid_items_for_bulk_insertion) { described_class.invalid_list(10) }
+  describe 'BulkInsertItem' do
+    it_behaves_like 'a BulkInsertSafe model' do
+      let(:target_class) { bulk_insert_item_class.dup }
+      let(:valid_items_for_bulk_insertion) { target_class.valid_list(10) }
+      let(:invalid_items_for_bulk_insertion) { target_class.invalid_list(10) }
     end
 
     context 'when inheriting class methods' do
+      let(:inherited_unsafe_methods_module) do
+        Module.new do
+          extend ActiveSupport::Concern
+
+          included do
+            after_save -> { "unsafe" }
+          end
+        end
+      end
+
+      let(:inherited_safe_methods_module) do
+        Module.new do
+          extend ActiveSupport::Concern
+
+          included do
+            after_initialize -> { "safe" }
+          end
+        end
+      end
+
       it 'raises an error when method is not bulk-insert safe' do
-        expect { described_class.include(InheritedUnsafeMethods) }
-          .to raise_error(described_class::MethodNotAllowedError)
+        expect { bulk_insert_item_class.include(inherited_unsafe_methods_module) }
+          .to raise_error(bulk_insert_item_class::MethodNotAllowedError)
       end
 
       it 'does not raise an error when method is bulk-insert safe' do
-        expect { described_class.include(InheritedSafeMethods) }.not_to raise_error
+        expect { bulk_insert_item_class.include(inherited_safe_methods_module) }.not_to raise_error
       end
     end
 
     context 'primary keys' do
       it 'raises error if primary keys are set prior to insertion' do
-        item = described_class.new(name: 'valid', id: 10)
+        item = bulk_insert_item_class.new(name: 'valid', id: 10)
 
-        expect { described_class.bulk_insert!([item]) }
-          .to raise_error(described_class::PrimaryKeySetError)
+        expect { bulk_insert_item_class.bulk_insert!([item]) }
+          .to raise_error(bulk_insert_item_class::PrimaryKeySetError)
       end
     end
 
     describe '.bulk_insert!' do
       it 'inserts items in the given number of batches' do
-        items = described_class.valid_list(10)
+        items = bulk_insert_item_class.valid_list(10)
 
         expect(ActiveRecord::InsertAll).to receive(:new).twice.and_call_original
 
-        described_class.bulk_insert!(items, batch_size: 5)
+        bulk_insert_item_class.bulk_insert!(items, batch_size: 5)
       end
 
       it 'items can be properly fetched from database' do
-        items = described_class.valid_list(10)
+        items = bulk_insert_item_class.valid_list(10)
 
-        described_class.bulk_insert!(items)
+        bulk_insert_item_class.bulk_insert!(items)
 
-        attribute_names = described_class.attribute_names - %w[id created_at updated_at]
-        expect(described_class.last(items.size).pluck(*attribute_names)).to eq(
+        attribute_names = bulk_insert_item_class.attribute_names - %w[id created_at updated_at]
+        expect(bulk_insert_item_class.last(items.size).pluck(*attribute_names)).to eq(
           items.pluck(*attribute_names))
       end
 
       it 'rolls back the transaction when any item is invalid' do
         # second batch is bad
-        all_items = described_class.valid_list(10) +
-          described_class.invalid_list(10)
+        all_items = bulk_insert_item_class.valid_list(10) +
+          bulk_insert_item_class.invalid_list(10)
 
         expect do
-          described_class.bulk_insert!(all_items, batch_size: 2) rescue nil
-        end.not_to change { described_class.count }
+          bulk_insert_item_class.bulk_insert!(all_items, batch_size: 2) rescue nil
+        end.not_to change { bulk_insert_item_class.count }
       end
 
       it 'does nothing and returns an empty array when items are empty' do
-        expect(described_class.bulk_insert!([])).to eq([])
-        expect(described_class.count).to eq(0)
+        expect(bulk_insert_item_class.bulk_insert!([])).to eq([])
+        expect(bulk_insert_item_class.count).to eq(0)
       end
 
       context 'with returns option set' do
         context 'when is set to :ids' do
           it 'return an array with the primary key values for all inserted records' do
-            items = described_class.valid_list(1)
+            items = bulk_insert_item_class.valid_list(1)
 
-            expect(described_class.bulk_insert!(items, returns: :ids)).to contain_exactly(a_kind_of(Integer))
+            expect(bulk_insert_item_class.bulk_insert!(items, returns: :ids)).to contain_exactly(a_kind_of(Integer))
           end
         end
 
         context 'when is set to nil' do
           it 'returns an empty array' do
-            items = described_class.valid_list(1)
+            items = bulk_insert_item_class.valid_list(1)
 
-            expect(described_class.bulk_insert!(items, returns: nil)).to eq([])
+            expect(bulk_insert_item_class.bulk_insert!(items, returns: nil)).to eq([])
           end
         end
 
         context 'when is set to anything else' do
           it 'raises an error' do
-            items = described_class.valid_list(1)
+            items = bulk_insert_item_class.valid_list(1)
 
-            expect { described_class.bulk_insert!([items], returns: [:id, :name]) }
+            expect { bulk_insert_item_class.bulk_insert!([items], returns: [:id, :name]) }
               .to raise_error(ArgumentError, "returns needs to be :ids or nil")
           end
         end
@@ -167,20 +172,20 @@ RSpec.describe BulkInsertSafe do
     end
 
     context 'when duplicate items are to be inserted' do
-      let!(:existing_object) { described_class.create!(name: 'duplicate', secret_value: 'old value') }
-      let(:new_object) { described_class.new(name: 'duplicate', secret_value: 'new value') }
+      let!(:existing_object) { bulk_insert_item_class.create!(name: 'duplicate', secret_value: 'old value') }
+      let(:new_object) { bulk_insert_item_class.new(name: 'duplicate', secret_value: 'new value') }
 
       describe '.bulk_insert!' do
         context 'when skip_duplicates is set to false' do
           it 'raises an exception' do
-            expect { described_class.bulk_insert!([new_object], skip_duplicates: false) }
+            expect { bulk_insert_item_class.bulk_insert!([new_object], skip_duplicates: false) }
               .to raise_error(ActiveRecord::RecordNotUnique)
           end
         end
 
         context 'when skip_duplicates is set to true' do
           it 'does not update existing object' do
-            described_class.bulk_insert!([new_object], skip_duplicates: true)
+            bulk_insert_item_class.bulk_insert!([new_object], skip_duplicates: true)
 
             expect(existing_object.reload.secret_value).to eq('old value')
           end
@@ -189,7 +194,7 @@ RSpec.describe BulkInsertSafe do
 
       describe '.bulk_upsert!' do
         it 'updates existing object' do
-          described_class.bulk_upsert!([new_object], unique_by: %w[name])
+          bulk_insert_item_class.bulk_upsert!([new_object], unique_by: %w[name])
 
           expect(existing_object.reload.secret_value).to eq('new value')
         end