Make the RbNaCl dependent tests optional

.travis.yml

@@ -10,6 +10,7 @@ rvm:
 gemfile:
   - gemfiles/standalone.gemfile
   - gemfiles/openssl_2.1.gemfile
+  - gemfiles/rbnacl.gemfile
 script: 
   - bundle exec rspec 
   - bundle exec codeclimate-test-reporter

gemfiles/rbnacl.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "rbnacl"
+
+gemspec path: "../"

spec/jwt_spec.rb

@@ -7,7 +7,7 @@
   let(:payload) { { 'user_id' => '[email protected]' } }
 
   let :data do
-    {
+   data = {
       :secret => 'My$ecretK3y',
       :rsa_private => OpenSSL::PKey.read(File.read(File.join(CERT_PATH, 'rsa-2048-private.pem'))),
       :rsa_public => OpenSSL::PKey.read(File.read(File.join(CERT_PATH, 'rsa-2048-public.pem'))),
@@ -19,8 +19,6 @@
       'ES384_public' => OpenSSL::PKey.read(File.read(File.join(CERT_PATH, 'ec384-public.pem'))),
       'ES512_private' => OpenSSL::PKey.read(File.read(File.join(CERT_PATH, 'ec512-private.pem'))),
       'ES512_public' => OpenSSL::PKey.read(File.read(File.join(CERT_PATH, 'ec512-public.pem'))),
-      'ED25519_private' =>  RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF'),
-      'ED25519_public' => RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF').verify_key,
       'NONE' => 'eyJhbGciOiJub25lIn0.eyJ1c2VyX2lkIjoic29tZUB1c2VyLnRsZCJ9.',
       'HS256' => 'eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoic29tZUB1c2VyLnRsZCJ9.kWOVtIOpWcG7JnyJG0qOkTDbOy636XrrQhMm_8JrRQ8',
       'HS512256' => 'eyJhbGciOiJIUzUxMjI1NiJ9.eyJ1c2VyX2lkIjoic29tZUB1c2VyLnRsZCJ9.Ds_4ibvf7z4QOBoKntEjDfthy3WJ-3rKMspTEcHE2bA',
@@ -36,6 +34,14 @@
       'PS384' => '',
       'PS512' => ''
     }
+
+    if defined?(RbNaCl)
+      data.merge!(
+        'ED25519_private' =>  RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF'),
+        'ED25519_public' => RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF').verify_key,
+      )
+    end
+    data
   end
 
   after(:each) do
@@ -110,7 +116,7 @@
       JWT.encode payload, "secret", JWT::Algos::Hmac::SUPPORTED.sample
     end
   end
-
+  if defined?(RbNaCl)
   %w[HS256 HS512256 HS384 HS512].each do |alg|
     context "alg: #{alg}" do
       it 'should generate a valid token' do
@@ -300,7 +306,7 @@
       end
     end
   end
-
+end
   context 'Invalid' do
     it 'algorithm should raise NotImplementedError' do
       expect do