diff --git a/spec/lib/use_case/reaction/create_spec.rb b/spec/lib/use_case/reaction/create_spec.rb
new file mode 100644
index 00000000..a438f108
--- /dev/null
+++ b/spec/lib/use_case/reaction/create_spec.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe UseCase::Reaction::Create do
+  shared_examples_for "valid target type" do
+    it "creates a reaction" do
+      expect { subject }.to change { target.smile_count }.by(1)
+    end
+  end
+
+  subject { UseCase::Reaction::Create.call(source_user: user, target:) }
+
+  let(:user) { FactoryBot.create(:user) }
+
+  context "target is an Answer" do
+    let(:target) { FactoryBot.create(:answer, user:) }
+
+    include_examples "valid target type"
+  end
+
+  context "target is a Comment" do
+    let(:target) { FactoryBot.create(:comment, user:, answer: FactoryBot.create(:answer, user:)) }
+
+    include_examples "valid target type"
+  end
+
+  context "target is a Question" do
+    let(:target) { FactoryBot.create(:question) }
+
+    include_examples "raises an error", Dry::Types::ConstraintError
+  end
+end
diff --git a/spec/lib/use_case/reaction/destroy_spec.rb b/spec/lib/use_case/reaction/destroy_spec.rb
new file mode 100644
index 00000000..44c0e9a2
--- /dev/null
+++ b/spec/lib/use_case/reaction/destroy_spec.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe UseCase::Reaction::Destroy do
+  shared_examples_for "valid target type" do
+    before do
+      user.smile target
+    end
+
+    it "destroys a reaction" do
+      expect { subject }.to change { target.smile_count }.by(-1)
+    end
+  end
+
+  subject { UseCase::Reaction::Destroy.call(source_user: user, target:) }
+
+  let(:user) { FactoryBot.create(:user) }
+
+  context "target is an Answer" do
+    let(:target) { FactoryBot.create(:answer, user:) }
+
+    include_examples "valid target type"
+  end
+
+  context "target is a Comment" do
+    let(:target) { FactoryBot.create(:comment, user:, answer: FactoryBot.create(:answer, user:)) }
+
+    include_examples "valid target type"
+  end
+end