Test otp generation

prs/prs-rest-server/src/main/java/com/adorsys/webank/OtpRestServer.java

@@ -3,7 +3,6 @@
 import com.adorsys.webank.dto.OtpRequest;
 import com.adorsys.webank.dto.OtpValidationRequest;
 import com.adorsys.webank.service.OtpServiceApi;
-import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController

prs/prs-service-api/src/main/java/com/adorsys/webank/service/OtpServiceApi.java

@@ -1,6 +1,4 @@
 package com.adorsys.webank.service;
-
-import org.springframework.stereotype.Component;
 import org.springframework.stereotype.Service;
 
 @Service

prs/prs-service-impl/src/test/java/com/adorsys/webank/serviceimpl/OtpServiceTest.java

@@ -0,0 +1,21 @@
+package com.adorsys.webank.serviceimpl;
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class OtpServiceTest {
+
+
+    OtpServiceImpl otpServiceImpl = new OtpServiceImpl();
+
+    @Test
+    void generateFourDigitOtp() {
+        String otp = otpServiceImpl.generateOtp();
+
+        assertNotNull(otp, "Otp should not be null");
+        assert otp.length() == 4 : "Otp should be four digits";
+        assert otp.matches("\\d+") : "Otp should only contain digits";
+        assert Integer.parseInt(otp) >= 1000 && Integer.parseInt(otp) <= 9999 : "Otp should be between 1000 and 9999";
+    }
+
+}