diff --git a/spec/record_level/invalid_tag_spec.rb b/spec/record_level/invalid_tag_spec.rb
new file mode 100644
index 0000000..c4fe5ef
--- /dev/null
+++ b/spec/record_level/invalid_tag_spec.rb
@@ -0,0 +1,16 @@
+require 'marc_cleanup'
+require 'byebug'
+
+RSpec.describe 'invalid_tag' do
+    let(:fields) do
+      [
+        { 'ABC' => { 'indicator1' => ' ',
+                     'indicator2' => ' ',
+                     'subfields' => [{ 'a' => 'Non-numeric tag' }] } }
+      ]
+    end
+    let(:record) { MARC::Record.new_from_hash('fields' => fields) }
+    it 'finds the non-numeric tag' do
+      expect(MarcCleanup.invalid_tag?(record)).to eq true
+    end
+  end
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