Avoid JRuby EC PEM round trip in specs

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: pboling

.rubocop_gradual.lock

@@ -6,15 +6,15 @@
     [166, 3, 39, "Gemspec/DependencyVersion: Dependency version specification is required.", 190611830],
     [167, 3, 45, "Gemspec/DependencyVersion: Dependency version specification is required.", 1496807756]
   ],
-  "spec/lib/omniauth/strategies/jwt_spec.rb:3056129689": [
+  "spec/lib/omniauth/strategies/jwt_spec.rb:268640036": [
     [3, 1, 40, "RSpec/SpecFilePathFormat: Spec path should end with `omni_auth/strategies/jwt*_spec.rb`.", 1545891400],
     [20, 13, 25, "RSpec/DescribedClass: Use `described_class` instead of `OmniAuth::Strategies::JWT`.", 2234488924],
     [32, 11, 15, "RSpec/ContextWording: Context description should match /^when\\b/, /^with\\b/, or /^without\\b/.", 391893083],
     [42, 11, 16, "RSpec/ContextWording: Context description should match /^when\\b/, /^with\\b/, or /^without\\b/.", 1409468707],
     [129, 9, 20, "RSpec/StubbedMock: Prefer `allow` over `expect` when configuring a response.", 2951559342],
     [133, 5, 125, "RSpec/LeakyLocalVariable: Do not use local variables defined outside of examples inside of them.", 689775740],
     [143, 5, 56, "Performance/RedundantMerge: Use `algos[OpenSSL::PKey::EC] = %w[ES256 ES384 ES512]` instead of `algos.merge!(OpenSSL::PKey::EC => %w[ES256 ES384 ES512])`.", 2983772293],
-    [173, 13, 28, "RSpec/ContextWording: Context description should match /^when\\b/, /^with\\b/, or /^without\\b/.", 1877551307]
+    [179, 13, 28, "RSpec/ContextWording: Context description should match /^when\\b/, /^with\\b/, or /^without\\b/.", 1877551307]
   ],
   "spec/spec_helper.rb:2608937500": [
     [50, 3, 34, "RSpec/Output: Do not write to stdout in specs.", 1097326571],

spec/lib/omniauth/strategies/jwt_spec.rb

@@ -145,21 +145,27 @@ def generate_ec_private_key(curve_name)
       algorithms.each do |algorithm|
         context "when the #{algorithm} algorithm is used" do
           let(:algorithm) { algorithm }
+          let(:ecdsa_private_key) { generate_ec_private_key(ecdsa_named_curves[algorithm]) }
           let(:secret) do
             # rubocop:disable Style/CaseLikeIf
             if private_key_class == OpenSSL::PKey::RSA
               private_key_class.generate(2048)
                 .to_pem
             elsif private_key_class == OpenSSL::PKey::EC
-              generate_ec_private_key(ecdsa_named_curves[algorithm])
-                .to_pem
+              ecdsa_private_key.to_pem
             else
               private_key_class.new(rand_secret)
             end
             # rubocop:enable Style/CaseLikeIf
           end
 
-          let(:private_key) { private_key_class ? private_key_class.new(secret) : secret }
+          let(:private_key) do
+            if private_key_class == OpenSSL::PKey::EC
+              ecdsa_private_key
+            else
+              private_key_class.new(secret)
+            end
+          end
 
           it "decodes the user information" do
             result = subject.decoded