FINERACT-2181: add e2e test to cover additional future unrecognized interest use-case

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

@@ -364,6 +364,13 @@ public final class ErrorMessageHelper {
                 expectedToStr);
     }
 
+    public static String wrongAmountInTotalUnpaidPayableDueInterest(Double actual, Double expected) {
+        String actualToStr = actual.toString();
+        String expectedToStr = expected.toString();
+        return String.format("Wrong amount in Loan total unpaid payable due interest. Actual amount is: %s - But expected amount is: %s",
+                actualToStr, expectedToStr);
+    }
+
     public static String wrongAmountInTotalOverdue(Double actual, Double expected) {
         String actualToStr = actual.toString();
         String expectedToStr = expected.toString();

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

@@ -1907,6 +1907,22 @@ public class LoanStepDef extends AbstractStepDef {
                 .isEqualTo(totalInterestOutstandingExpected);
     }
 
+    @Then("Loan has {double} total unpaid payable due interest")
+    public void loanTotalUnpaidPayableDueInterest(double totalUnpaidPayableDueInterestExpected) throws IOException {
+        Response<PostLoansResponse> loanCreateResponse = testContext().get(TestContextKey.LOAN_CREATE_RESPONSE);
+        long loanId = loanCreateResponse.body().getLoanId();
+
+        Response<GetLoansLoanIdResponse> loanDetailsResponse = loansApi.retrieveLoan(loanId, false, "repaymentSchedule", "", "").execute();
+        ErrorHelper.checkSuccessfulApiCall(loanDetailsResponse);
+        testContext().set(TestContextKey.LOAN_RESPONSE, loanDetailsResponse);
+
+        Double totalUnpaidPayableDueInterestActual = loanDetailsResponse.body().getSummary().getTotalUnpaidPayableDueInterest()
+                .doubleValue();
+        assertThat(totalUnpaidPayableDueInterestActual).as(ErrorMessageHelper
+                .wrongAmountInTotalUnpaidPayableDueInterest(totalUnpaidPayableDueInterestActual, totalUnpaidPayableDueInterestExpected))
+                .isEqualTo(totalUnpaidPayableDueInterestExpected);
+    }
+
     @Then("Loan has {double} overpaid amount")
     public void loanOverpaid(double totalOverpaidExpected) throws IOException {
         Response<PostLoansResponse> loanCreateResponse = testContext().get(TestContextKey.LOAN_CREATE_RESPONSE);