FINERACT-2311: added e2e tests for validation of buy down fees reversal of existing transaction

fineract-e2e-tests-core/src/test/java/org/apache/fineract/test/helper/ErrorMessageHelper.java

@@ -179,6 +179,11 @@ public final class ErrorMessageHelper {
         return "Capitalized income transaction cannot be reversed when non-reversed adjustment exists for it.";
     }
 
+    public static String buyDownFeeUndoFailureAdjustmentExists(Long loanId) {
+        String loanIdStr = String.valueOf(loanId);
+        return String.format("Undo Loan Transaction: %s is not allowed. Loan transaction has not reversed transaction related", loanIdStr);
+    }
+
     public static String wrongAmountInRepaymentSchedule(int line, BigDecimal actual, BigDecimal expected) {
         String lineToStr = String.valueOf(line);
         String actualToStr = actual.toString();

fineract-e2e-tests-core/src/test/java/org/apache/fineract/test/stepdef/loan/LoanRepaymentStepDef.java

@@ -538,7 +538,13 @@ public class LoanRepaymentStepDef extends AbstractStepDef {
 
         Response<PostLoansLoanIdTransactionsResponse> transactionUndoResponse = loanTransactionsApi
                 .adjustLoanTransaction(loanId, targetTransaction.getId(), transactionUndoRequest, "").execute();
-        checkMakeTransactionForbidden(transactionUndoResponse, 403, ErrorMessageHelper.addCapitalizedIncomeUndoFailureAdjustmentExists());
+        if (transactionType.equals("Buy Down Fee")) {
+            checkMakeTransactionForbidden(transactionUndoResponse, 403,
+                    ErrorMessageHelper.buyDownFeeUndoFailureAdjustmentExists(targetTransaction.getId()));
+        } else if (transactionType.equals("Capitalized Income")) {
+            checkMakeTransactionForbidden(transactionUndoResponse, 403,
+                    ErrorMessageHelper.addCapitalizedIncomeUndoFailureAdjustmentExists());
+        }
     }
 
     @When("Customer undo {string}th {string} transaction made on {string} with linked {string} transaction")