diff --git a/spec/components/custom_wizard/realtime_validations/similar_topics_spec.rb b/spec/components/custom_wizard/realtime_validations/similar_topics_spec.rb
new file mode 100644
index 00000000..47676d98
--- /dev/null
+++ b/spec/components/custom_wizard/realtime_validations/similar_topics_spec.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+describe ::CustomWizard::RealtimeValidation::SimilarTopics do
+  let(:post) {  create_post(title: "matching similar topic") }
+  let(:topic) {  post.topic }
+  let(:user) { post.user }
+
+  let(:category) { Fabricate(:category) }
+  let(:cat_post) {  create_post(title: "matching similar topic slightly different", category: category) }
+  let(:cat_topic) {  cat_post.topic }
+  let(:user) { cat_post.user }
+
+  before do
+    SiteSetting.min_title_similar_length = 5
+    Topic.stubs(:count_exceeds_minimum?).returns(true)
+    SearchIndexer.enable
+  end
+
+  it "fetches similar topics" do
+    validation = ::CustomWizard::RealtimeValidation::SimilarTopics.new(user)
+    result = validation.perform({ title: topic.title.chars.take(10).join })
+    expect(result.items.length).to eq(2)
+  end
+
+  it "filters topics based on category" do
+    validation = ::CustomWizard::RealtimeValidation::SimilarTopics.new(user)
+    result = validation.perform({ title: "matching similar", categories: [category.id.to_s] })
+    expect(result.items.length).to eq(1)
+  end
+
+  it "filters topics based on created date" do
+    topic.update!(created_at: 1.day.ago)
+    cat_topic.update!(created_at: 2.days.ago)
+
+    validation = ::CustomWizard::RealtimeValidation::SimilarTopics.new(user)
+    result = validation.perform({ title: "matching similar", date_after:  1.day.ago.to_date.to_s })
+    expect(result.items.length).to eq(1)
+  end
+end