1 files changed, 51 insertions, 0 deletions
diff --git a/spec/models/internal_id_spec.rb b/spec/models/internal_id_spec.rb
index ff2382838ae..0ed4e146caa 100644
--- a/spec/models/internal_id_spec.rb
+++ b/spec/models/internal_id_spec.rb
@@ -107,6 +107,57 @@ describe InternalId do
     end
   end
 
+  describe '.reset' do
+    subject { described_class.reset(issue, scope, usage, value) }
+
+    context 'in the absence of a record' do
+      let(:value) { 2 }
+
+      it 'does not revert back the value' do
+        expect { subject }.not_to change { described_class.count }
+        expect(subject).to be_falsey
+      end
+    end
+
+    context 'when valid iid is used to reset' do
+      let!(:value) { generate_next }
+
+      context 'and iid is a latest one' do
+        it 'does rewind and next generated value is the same' do
+          expect(subject).to be_truthy
+          expect(generate_next).to eq(value)
+        end
+      end
+
+      context 'and iid is not a latest one' do
+        it 'does not rewind' do
+          generate_next
+
+          expect(subject).to be_falsey
+          expect(generate_next).to be > value
+        end
+      end
+
+      def generate_next
+        described_class.generate_next(issue, scope, usage, init)
+      end
+    end
+
+    context 'with an insufficient schema version' do
+      let(:value) { 2 }
+
+      before do
+        described_class.reset_column_information
+        # Project factory will also call the current_version
+        expect(ActiveRecord::Migrator).to receive(:current_version).twice.and_return(InternalId::REQUIRED_SCHEMA_VERSION - 1)
+      end
+
+      it 'does not reset any of the iids' do
+        expect(subject).to be_falsey
+      end
+    end
+  end
+
   describe '.track_greatest' do
     let(:value) { 9001 }
     subject { described_class.track_greatest(issue, scope, usage, value, init) }