Add specs for validate_encryption_key!

spec/database_configuration_spec.rb

@@ -345,6 +345,7 @@ def say(*_args)
       it "normal case" do
         allow(@config).to receive_messages(:validated => true)
         expect(@config).to receive(:create_or_join_region).and_return(true)
+        expect(@config).to receive(:validate_encryption_key!).and_return(true)
 
         allow(@config).to receive_messages(:merged_settings => @settings)
         expect(@config).to receive(:do_save).with(@settings)
@@ -377,6 +378,11 @@ def say(*_args)
           allow(@config).to receive(:create_or_join_region).and_raise
           expect(@config.activate).to be_falsey
         end
+
+        it "where the encryption key is invalid" do
+          allow(ManageIQ::ApplianceConsole::Utilities).to receive(:rake).with("evm:validate_encryption_key", {}).and_return(false)
+          expect(@config.activate).to be_falsey
+        end
       end
     end