diff --git a/lib/interactify/async/job_maker.rb b/lib/interactify/async/job_maker.rb
index 87fff56..f3e679c 100644
--- a/lib/interactify/async/job_maker.rb
+++ b/lib/interactify/async/job_maker.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "interactify/async/job_klass"
-require "interactify/async/null_job"
 
 module Interactify
   module Async
@@ -23,7 +22,7 @@ def job_klass
         private
 
         def define_job_klass
-          return NullJob if Interactify.sidekiq_missing?
+          return if Interactify.sidekiq_missing?
 
           this = self
 
diff --git a/lib/interactify/async/jobable.rb b/lib/interactify/async/jobable.rb
index 8375b8d..d09dea0 100644
--- a/lib/interactify/async/jobable.rb
+++ b/lib/interactify/async/jobable.rb
@@ -15,6 +15,8 @@ module Jobable
         next if Interactify.sidekiq_missing?
 
         def base.inherited(klass)
+          return if Interactify.sidekiq_missing?
+
           super_klass = klass.superclass
           super_job = super_klass::Job # really spiffing
 
diff --git a/lib/interactify/async/null_job.rb b/lib/interactify/async/null_job.rb
deleted file mode 100644
index a3e788f..0000000
--- a/lib/interactify/async/null_job.rb
+++ /dev/null
@@ -1,23 +0,0 @@
-# frozen_string_literal: true
-
-module Interactify
-  module Async
-    class NullJob
-      def method_missing(...)
-        self
-      end
-
-      def self.method_missing(...)
-        self
-      end
-
-      def respond_to_missing?(...)
-        true
-      end
-
-      def self.respond_to_missing?(...)
-        true
-      end
-    end
-  end
-end
diff --git a/lib/interactify/configure.rb b/lib/interactify/configure.rb
index 1196416..ffea00e 100644
--- a/lib/interactify/configure.rb
+++ b/lib/interactify/configure.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Interactify
   module Configure
     def validate_app(ignore: [])
diff --git a/lib/interactify/contracts/breaches.rb b/lib/interactify/contracts/breaches.rb
index bf395e2..1ff5828 100644
--- a/lib/interactify/contracts/breaches.rb
+++ b/lib/interactify/contracts/breaches.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Interactify
   module Breaches
     def self.handle_with_failure(context, breaches)
diff --git a/lib/interactify/dependency_inference.rb b/lib/interactify/dependency_inference.rb
index 662733e..b6fd324 100644
--- a/lib/interactify/dependency_inference.rb
+++ b/lib/interactify/dependency_inference.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Interactify
   class << self
     delegate :on_definition_error, :trigger_definition_error, to: :configuration
@@ -10,10 +12,6 @@ def railties_missing!
       @railties_missing = true
     end
 
-    def railties
-      railties?
-    end
-
     def railties?
       !railties_missing?
     end
@@ -26,10 +24,6 @@ def sidekiq_missing!
       @sidekiq_missing = true
     end
 
-    def sidekiq
-      sidekiq?
-    end
-
     def sidekiq?
       !sidekiq_missing?
     end
diff --git a/lib/interactify/hooks.rb b/lib/interactify/hooks.rb
index 5b52883..b77b282 100644
--- a/lib/interactify/hooks.rb
+++ b/lib/interactify/hooks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Interactify
   module Hooks
     def reset
diff --git a/spec/integration/all_the_things_integration_spec.rb b/spec/integration/all_the_things_integration_spec.rb
index 277f3b5..e971202 100644
--- a/spec/integration/all_the_things_integration_spec.rb
+++ b/spec/integration/all_the_things_integration_spec.rb
@@ -16,7 +16,9 @@
   before do
     load_interactify_fixtures("each")
     load_interactify_fixtures("if/")
-    load "./spec/fixtures/integration_app/app/interactors/all_the_things.rb"
+    silence_warnings do
+      load "./spec/fixtures/integration_app/app/interactors/all_the_things.rb"
+    end
   end
 
   context "without an optional thing" do
diff --git a/spec/integration/each_integration_spec.rb b/spec/integration/each_integration_spec.rb
index bcb37e2..3bcb639 100644
--- a/spec/integration/each_integration_spec.rb
+++ b/spec/integration/each_integration_spec.rb
@@ -4,7 +4,9 @@
   before do
     files = Dir.glob("./spec/fixtures/integration_app/app/interactors/each/**/*.rb")
     files.each do |file|
-      require file
+      silence_warnings do
+        load file
+      end
     end
   end
 
diff --git a/spec/lib/interactify/async/job_maker_spec.rb b/spec/lib/interactify/async/job_maker_spec.rb
index 0015a68..339f7a9 100644
--- a/spec/lib/interactify/async/job_maker_spec.rb
+++ b/spec/lib/interactify/async/job_maker_spec.rb
@@ -31,7 +31,7 @@
 
   describe "concerning JobClass" do
     describe "#job_klass" do
-      if Interactify.sidekiq
+      if Interactify.sidekiq?
         it "returns a job class" do
           job_klass = subject.job_klass
 
@@ -43,16 +43,16 @@
           expect(job_klass.included_modules).to include(Sidekiq::Job)
         end
       else
-        it "returns a null job_klass" do
+        it "returns nil" do
           job_klass = subject.job_klass
 
-          expect(job_klass).to eq(Interactify::Async::NullJob)
+          expect(job_klass).to eq(nil)
         end
       end
     end
   end
 
-  if Interactify.sidekiq
+  if Interactify.sidekiq?
     describe "concerning JobClass" do
       describe "#job_klass" do
         it "job class includes JOBABLE_OPTS constant" do
diff --git a/spec/lib/interactify/wiring_spec.rb b/spec/lib/interactify/wiring_spec.rb
index 2cdb248..d069808 100644
--- a/spec/lib/interactify/wiring_spec.rb
+++ b/spec/lib/interactify/wiring_spec.rb
@@ -12,7 +12,7 @@
   end
 
   before do
-    Dir.glob("#{root}**/*.rb").each { |f| require(f) }
+    Dir.glob("#{root}**/*.rb").each { |f| silence_warnings { require(f) } }
   end
 
   def f(path)
@@ -82,4 +82,141 @@ def f(path)
       end
     end
   end
+
+  describe "#ignore_klass?" do
+    self::DummyInteractor = Class.new do
+      include Interactify
+    end
+
+    let(:klass) { self.class::DummyInteractor }
+    let(:wiring) { described_class.new(root:, ignore:) }
+    let(:result) { wiring.send(:ignore_klass?, wiring.ignore, klass) }
+
+    def self.it_ignores
+      it "ignores" do
+        expect(result).to be true
+      end
+    end
+
+    context "with an array of classes" do
+      let(:ignore) { [klass] }
+
+      it_ignores
+    end
+
+    context "with a regexp" do
+      let(:ignore) { [/Dummy/] }
+
+      it_ignores
+    end
+
+    context "with a string" do
+      let(:ignore) { ["DummyInteractor"] }
+
+      it_ignores
+    end
+
+    context "proc condition" do
+      let(:ignore) { [->(k) { k.to_s =~ /DummyInteractor/ }] }
+
+      it_ignores
+    end
+
+    context "empty ignore" do
+      let(:ignore) { [] }
+
+      it "does not ignore class" do
+        expect(result).to be false
+      end
+    end
+  end
+  context "with errors" do
+    let(:organizer1) { double("Organizer1", klass: "SomeOrganizer1") }
+    let(:organizer2) { double("Organizer2", klass: "SomeOrganizer2") }
+
+    let(:interactor1) { double("Interactor1", klass: "SomeInteractor1") }
+    let(:interactor2) { double("Interactor2", klass: "SomeInteractor2") }
+    let(:interactor3) { double("Interactor3", klass: "SomeInteractor3") }
+
+    describe "#format_error" do
+      let(:missing_keys) { %i[foo bar] }
+      let(:interactor) { double("Interactor", klass: "SomeInteractor") }
+      let(:organizer) { double("Organizer", klass: "SomeOrganizer") }
+      let(:formatted_errors) { [] }
+
+      it "formats the error message correctly" do
+        subject.send(:format_error, missing_keys, interactor, organizer, formatted_errors)
+        expect(formatted_errors.first).to include("Missing keys: :foo, :bar")
+        expect(formatted_errors.first).to include("expected in: SomeInteractor")
+        expect(formatted_errors.first).to include("called by: SomeOrganizer")
+      end
+    end
+
+    describe "#format_errors" do
+      it "formats and combines all errors" do
+        all_errors = {
+          organizer1 => double(
+            "ErrorContext",
+            missing_keys: {
+              interactor1 => %i[key1 key2]
+            }
+          ),
+          organizer2 => double(
+            "ErrorContext",
+            missing_keys: {
+              interactor2 => [:key3]
+            }
+          )
+        }
+
+        expect(subject).to receive(:format_error).twice.and_call_original
+        formatted_error_string = subject.format_errors(all_errors)
+        expect(formatted_error_string).to include("Missing keys: :key1, :key2")
+        expect(formatted_error_string).to include("Missing keys: :key3")
+        expect(formatted_error_string).to match(/expected in:.*\n\s+called by:/)
+      end
+    end
+
+    describe "#each_error" do
+      it "yields each error unless the class is ignored" do
+        all_errors = {
+          organizer1 => double(
+            "ErrorContext",
+            missing_keys: {
+              interactor1 => [:key1],
+              interactor2 => [:key2]
+            }
+          ),
+          organizer2 => double(
+            "ErrorContext",
+            missing_keys: {
+              interactor3 => [:key3]
+            }
+          )
+        }
+
+        allow(subject).to receive(:ignore_klass?).and_return(false)
+
+        expect { |b| subject.each_error(all_errors, &b) }
+          .to yield_successive_args(
+            [[:key1], anything, anything],
+            [[:key2], anything, anything],
+            [[:key3], anything, anything]
+          )
+      end
+
+      it "does not yield errors for ignored classes" do
+        all_errors = {
+          organizer1 => double(
+            "ErrorContext",
+            missing_keys: {
+              interactor1 => [:key1]
+            }
+          )
+        }
+        allow(subject).to receive(:ignore_klass?).and_return(true)
+        expect { |b| subject.each_error(all_errors, &b) }.not_to yield_control
+      end
+    end
+  end
 end
diff --git a/spec/support/spec_support.rb b/spec/support/spec_support.rb
index 3060172..2461788 100644
--- a/spec/support/spec_support.rb
+++ b/spec/support/spec_support.rb
@@ -8,7 +8,7 @@ def load_interactify_fixtures(sub_directory)
       files = Dir.glob("./spec/fixtures/integration_app/app/interactors/#{sub_directory}/**/*.rb")
 
       files.each do |file|
-        load file
+        silence_warnings { load file }
       end
     end
   end