diff --git a/config/initializers/administrate.rb b/config/initializers/administrate.rb
new file mode 100644
index 000000000..674d6c159
--- /dev/null
+++ b/config/initializers/administrate.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'administrate/field/associative'
+
+module Administrate
+  module Field
+    class Associative < Base
+      module Overrides
+        def deprecated_option(name)
+          name == :class_name ? options.fetch(name) : super
+        end
+      end
+    end
+  end
+end
+
+# Ref: https://github.com/thoughtbot/administrate/commit/f9c5f1af0bd27dbe8e98d43b2074b96004689ad5
+patch_required = Gem::Version.new(Administrate::VERSION) >= Gem::Version.new('1.0.0.beta3')
+raise 'Administrate::Field::Associative::Overrides patch is no longer required' if patch_required
+
+Administrate::Field::Associative.prepend(Administrate::Field::Associative::Overrides)
diff --git a/lib/for_education_code_generator.rb b/lib/for_education_code_generator.rb
index 4130a01f5..f0da81148 100644
--- a/lib/for_education_code_generator.rb
+++ b/lib/for_education_code_generator.rb
@@ -3,8 +3,12 @@
 class ForEducationCodeGenerator
   MAX_CODE = 1_000_000
 
+  cattr_accessor :random
+
+  self.random ||= Random.new
+
   def self.generate
-    number = Random.new.rand(MAX_CODE)
+    number = random.rand(MAX_CODE)
     code = format('%06d', number)
 
     code.match(/(\d\d)(\d\d)(\d\d)/) do |m|
diff --git a/spec/concepts/project/create_remix_spec.rb b/spec/concepts/project/create_remix_spec.rb
index 035cf65b9..3978c47bc 100644
--- a/spec/concepts/project/create_remix_spec.rb
+++ b/spec/concepts/project/create_remix_spec.rb
@@ -124,7 +124,8 @@
 
       it 'persists the new component' do
         remixed_project = create_remix[:project]
-        expect(remixed_project.components.first.attributes.symbolize_keys).to include(new_component_params)
+        new_component = remixed_project.components.find { |c| c.name == new_component_params[:name] }
+        expect(new_component.attributes.symbolize_keys).to include(new_component_params)
       end
     end
 
diff --git a/spec/concepts/school_teacher/invite_spec.rb b/spec/concepts/school_teacher/invite_spec.rb
index 6cb579110..43439010b 100644
--- a/spec/concepts/school_teacher/invite_spec.rb
+++ b/spec/concepts/school_teacher/invite_spec.rb
@@ -16,6 +16,11 @@
     expect(response.success?).to be(true)
   end
 
+  it 'does not return an error in operation response' do
+    response = described_class.call(school:, school_teacher_params:, token:)
+    expect(response[:error]).to be_blank
+  end
+
   it 'creates a TeacherInvitation' do
     expect { described_class.call(school:, school_teacher_params:, token:) }.to change(TeacherInvitation, :count)
   end
diff --git a/spec/lib/for_education_code_generator_spec.rb b/spec/lib/for_education_code_generator_spec.rb
index 4245cb5bc..2da0f6e1e 100644
--- a/spec/lib/for_education_code_generator_spec.rb
+++ b/spec/lib/for_education_code_generator_spec.rb
@@ -5,9 +5,7 @@
 RSpec.describe ForEducationCodeGenerator do
   describe '.generate' do
     it 'uses Random#rand to generate a random number up to the maximum' do
-      random = instance_double(Random)
-      allow(random).to receive(:rand).with(ForEducationCodeGenerator::MAX_CODE).and_return(123)
-      allow(Random).to receive(:new).and_return(random)
+      allow(described_class.random).to receive(:rand).with(ForEducationCodeGenerator::MAX_CODE).and_return(123)
 
       expect(described_class.generate).to eq('00-01-23')
     end
diff --git a/spec/models/school_project_spec.rb b/spec/models/school_project_spec.rb
index 54cc3a717..1bdcd94ee 100644
--- a/spec/models/school_project_spec.rb
+++ b/spec/models/school_project_spec.rb
@@ -3,5 +3,6 @@
 require 'rails_helper'
 
 RSpec.describe SchoolProject do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it { is_expected.to belong_to(:school) }
+  it { is_expected.to belong_to(:project) }
 end
diff --git a/spec/support/faker.rb b/spec/support/faker.rb
new file mode 100644
index 000000000..51d8d9cf7
--- /dev/null
+++ b/spec/support/faker.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+RSpec.configure do |config|
+  config.before(:suite) do
+    puts "Faker randomized with seed #{config.seed}"
+    Faker::Config.random = Random.new(config.seed)
+  end
+end
diff --git a/spec/support/for_education_code_generator.rb b/spec/support/for_education_code_generator.rb
new file mode 100644
index 000000000..4f28734c3
--- /dev/null
+++ b/spec/support/for_education_code_generator.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+RSpec.configure do |config|
+  config.before(:suite) do
+    puts "ForEducationCodeGenerator randomized with seed #{config.seed}"
+    ForEducationCodeGenerator.random = Random.new(config.seed)
+  end
+end