1 files changed, 63 insertions, 0 deletions
diff --git a/spec/lib/gitlab/utils/markdown_spec.rb b/spec/lib/gitlab/utils/markdown_spec.rb
new file mode 100644
index 00000000000..001ff5bc487
--- /dev/null
+++ b/spec/lib/gitlab/utils/markdown_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Utils::Markdown do
+  let(:klass) do
+    Class.new do
+      include Gitlab::Utils::Markdown
+    end
+  end
+
+  subject(:object) { klass.new }
+
+  describe '#string_to_anchor' do
+    subject { object.string_to_anchor(string) }
+
+    let(:string) { 'My Header' }
+
+    it 'converts string to anchor' do
+      is_expected.to eq 'my-header'
+    end
+
+    context 'when string has punctuation' do
+      let(:string) { 'My, Header!' }
+
+      it 'removes punctuation' do
+        is_expected.to eq 'my-header'
+      end
+    end
+
+    context 'when string starts and ends with spaces' do
+      let(:string) { '   My Header   ' }
+
+      it 'removes extra spaces' do
+        is_expected.to eq 'my-header'
+      end
+    end
+
+    context 'when string has multiple spaces and dashes in the middle' do
+      let(:string) { 'My -   -  -   Header' }
+
+      it 'removes consecutive dashes' do
+        is_expected.to eq 'my-header'
+      end
+    end
+
+    context 'when string contains only digits' do
+      let(:string) { '123' }
+
+      it 'adds anchor prefix' do
+        is_expected.to eq 'anchor-123'
+      end
+    end
+
+    context 'when string is empty' do
+      let(:string) { '' }
+
+      it 'returns an empty string' do
+        is_expected.to eq ''
+      end
+    end
+  end
+end