fix errors on flag evaluation logic

Signed-off-by: christian.lutnik <christian.lutnik@dynatrace.com>

Author: chrfwow

src/test/java/dev/openfeature/sdk/testutils/testProvider/TestProvider.java

@@ -292,12 +292,14 @@ public WithFlags errorsOnFlagEvaluation(boolean error) {
 
         @Override
         public WithFlags errorsOnFlagEvaluation(ErrorCode errorCode) {
+            this.errorsOnFlagEvaluation = true;
             this.errorCode = errorCode;
             return this;
         }
 
         @Override
         public WithFlags errorsOnFlagEvaluation(ErrorCode errorCode, String errorMessage) {
+            this.errorsOnFlagEvaluation = true;
             this.errorCode = errorCode;
             this.errorMessage = errorMessage;
             return this;