Improve error handling assertions in HttpLinkChecker spec

Author: rsmithlal

spec/services/better_together/metrics/http_link_checker_spec.rb

@@ -14,13 +14,15 @@ module BetterTogether
       expect([result.success, result.status_code, result.error]).to eq([true, '200', nil])
     end
 
-    it 'retries and returns failure for unreachable host' do
+    it 'retries and returns failure for unreachable host' do # rubocop:todo RSpec/MultipleExpectations
       stub_request(:head, 'https://nope.test/').to_timeout
 
       result = described_class.new('https://nope.test/', retries: 1).call
 
-      # failed, no status_code, error present
-      expect([result.success, result.status_code, result.error.class]).to eq([false, nil, StandardError])
+      # failed, no status_code, error present (error should be a StandardError ancestor)
+      expect(result.success).to be(false)
+      expect(result.status_code).to be_nil
+      expect(result.error).to be_a(StandardError)
     end
   end
 end