Tests for the RSA algo

spec/jwt/jwa/rsa_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe JWT::JWA::Rsa do
+  let(:rsa_key) { OpenSSL::PKey::RSA.generate(2048) }
+  let(:data) { 'test data' }
+  let(:rsa_instance) { described_class.new('RS256') }
+
+  describe '#initialize' do
+    it 'initializes with the correct algorithm and digest' do
+      expect(rsa_instance.instance_variable_get(:@alg)).to eq('RS256')
+      expect(rsa_instance.send(:digest).name).to eq('SHA256')
+    end
+  end
+
+  describe '#sign' do
+    context 'with a valid RSA key' do
+      it 'signs the data' do
+        signature = rsa_instance.sign(data: data, signing_key: rsa_key)
+        expect(signature).not_to be_nil
+      end
+    end
+
+    context 'with an invalid key' do
+      it 'raises an error' do
+        expect do
+          rsa_instance.sign(data: data, signing_key: 'invalid_key')
+        end.to raise_error(JWT::EncodeError, /The given key is a String. It has to be an OpenSSL::PKey::RSA instance/)
+      end
+    end
+  end
+
+  describe '#verify' do
+    let(:signature) { rsa_instance.sign(data: data, signing_key: rsa_key) }
+
+    context 'with a valid RSA key' do
+      it 'returns true' do
+        expect(rsa_instance.verify(data: data, signature: signature, verification_key: rsa_key)).to be(true)
+      end
+    end
+
+    context 'with an invalid signature' do
+      it 'returns false' do
+        expect(rsa_instance.verify(data: data, signature: 'invalid_signature', verification_key: rsa_key)).to be(false)
+      end
+    end
+
+    context 'with an invalid key' do
+      it 'returns false' do
+        expect(rsa_instance.verify(data: data, signature: 'invalid_signature', verification_key: OpenSSL::PKey::RSA.generate(2048))).to be(false)
+      end
+    end
+  end
+end