[TEST] Added tests for the PetValidator.java class. These tests will ensure that the proper validation of name, type and birthDate by testing valid and invalid parameter inputs.

src/test/java/org/springframework/samples/petclinic/owner/PetValidatorTests.java

@@ -0,0 +1,112 @@
+package org.springframework.samples.petclinic.owner;
+import static org.junit.Assert.*;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.util.Date;
+
+import org.junit.Test;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.Errors;
+
+public class PetValidatorTests {
+
+	@Test
+	public void testValidationWithValidName() {
+		//given
+		PetValidator petValidator = new PetValidator();
+        Pet validPet = new Pet();
+        validPet.setName("Peter");
+        Errors errors = new BeanPropertyBindingResult(validPet, "");
+
+        //when
+        petValidator.validate(validPet, errors);
+
+        //then
+        assertNull(errors.getFieldError("name"));
+	}
+	
+	@Test
+	public void testValidationWithInvalidName() {
+		//given
+		PetValidator petValidator = new PetValidator();
+        Pet invalidPet = new Pet();
+        invalidPet.setName("");
+        Errors errors = new BeanPropertyBindingResult(invalidPet, "");
+
+        //when
+        petValidator.validate(invalidPet, errors);
+
+        //then
+        assertTrue(errors.hasErrors());
+	}
+	
+	@Test
+	public void testValidationWithValidType() {
+        //given
+		PetValidator petValidator = new PetValidator();
+        Pet validPet = new Pet();
+        PetType tiger = new PetType();
+		tiger.setId(24);
+		validPet.setType(tiger);
+        Errors errors = new BeanPropertyBindingResult(validPet, "");
+
+        //when
+        petValidator.validate(validPet, errors);
+
+        //then
+        assertNull(errors.getFieldError("type"));
+	}
+	
+	@Test
+	public void testValidationWithInvalidType() {
+        //given
+		PetValidator petValidator = new PetValidator();
+        Pet invalidPet = new Pet();
+        PetType emptyType = null;
+		invalidPet.setType(emptyType);
+        Errors errors = new BeanPropertyBindingResult(invalidPet, "");
+
+        //when
+        petValidator.validate(invalidPet, errors);
+
+        //then
+        assertTrue(errors.hasErrors());
+	}
+	
+	@Test
+	public void testValidationWithValidBirthDate() {
+        //given
+		PetValidator petValidator = new PetValidator();
+        Pet validPet = new Pet();
+        LocalDateTime timePoint = LocalDateTime.now();
+		LocalDate localDate = timePoint.toLocalDate();
+		Date birthDate = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
+        validPet.setBirthDate(birthDate);
+        Errors errors = new BeanPropertyBindingResult(validPet, "");
+
+        //when
+        petValidator.validate(validPet, errors);
+
+        //then
+        assertNull(errors.getFieldError("birthDate"));
+	}
+	
+	@Test
+	public void testValidationWithInvalidBirthDate() {
+        //given
+		PetValidator petValidator = new PetValidator();
+        Pet invalidPet = new Pet();
+		Date birthDate = null;
+        invalidPet.setBirthDate(birthDate);
+        Errors errors = new BeanPropertyBindingResult(invalidPet, "");
+
+        //when
+        petValidator.validate(invalidPet, errors);
+
+        //then
+        assertTrue(errors.hasErrors());
+	}
+}
+