BAEL-5288 Code for the Map Date Types With openapi generator article (#13467)

Co-authored-by: thibault.faure <thibault.faure@mimacom.com>

spring-boot-modules/spring-boot-swagger-2/src/main/resources/static/event.yaml

@@ -0,0 +1,23 @@
+openapi: 3.0.0
+info:
+  title: an example api with dates
+  version: 0.1.0
+paths:
+components:
+  schemas:
+    Event:
+      type: object
+      properties:
+        organizer:
+          type: string
+        startDate:
+          type: string
+          format: date
+        endDate:
+          type: string
+          format: date-time
+        ticketSales:
+          type: string
+          description: Beginning of the ticket sales
+          example: "01-01-2023"
+          pattern: "[0-9]{2}-[0-9]{2}-[0-9]{4}"

spring-boot-modules/spring-boot-swagger-2/src/test/java/com/baeldung/dates/EventUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.dates;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Set;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.Validation;
+import javax.validation.Validator;
+
+import org.junit.jupiter.api.Test;
+
+import io.swagger.model.Event;
+
+class EventUnitTest {
+
+    private static final Validator VALIDATOR = Validation.buildDefaultValidatorFactory()
+        .getValidator();
+
+    @Test
+    void givenACorrectlyFormattedTicketSales_WhenBuildingEvent_ThenSuccess() {
+        Set<ConstraintViolation<Event>> violations = VALIDATOR.validate(new Event().ticketSales("01-01-2024"));
+        assertTrue(violations.isEmpty());
+    }
+
+    @Test
+    void givenAWronglyFormattedTicketSales_WhenBuildingEvent_ThenSuccess() {
+        Set<ConstraintViolation<Event>> violations = VALIDATOR.validate(new Event().ticketSales("2024-01-01"));
+        assertEquals(1, violations.size());
+    }
+
+}