1 files changed, 36 insertions, 0 deletions
diff --git a/spec/lib/gitlab/hash_digest/facade_spec.rb b/spec/lib/gitlab/hash_digest/facade_spec.rb
new file mode 100644
index 00000000000..b352744513e
--- /dev/null
+++ b/spec/lib/gitlab/hash_digest/facade_spec.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::HashDigest::Facade do
+  describe '.hexdigest' do
+    let(:plaintext) { 'something that is plaintext' }
+
+    let(:sha256_hash) { OpenSSL::Digest::SHA256.hexdigest(plaintext) }
+    let(:md5_hash) { Digest::MD5.hexdigest(plaintext) } # rubocop:disable Fips/MD5
+
+    it 'uses SHA256' do
+      expect(described_class.hexdigest(plaintext)).to eq(sha256_hash)
+    end
+
+    context 'when feature flags is not available' do
+      before do
+        allow(Feature).to receive(:feature_flags_available?).and_return(false)
+      end
+
+      it 'uses MD5' do
+        expect(described_class.hexdigest(plaintext)).to eq(md5_hash)
+      end
+    end
+
+    context 'when active_support_hash_digest_sha256 FF is disabled' do
+      before do
+        stub_feature_flags(active_support_hash_digest_sha256: false)
+      end
+
+      it 'uses MD5' do
+        expect(described_class.hexdigest(plaintext)).to eq(md5_hash)
+      end
+    end
+  end
+end