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Add unit tests for existsById() method #4137

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Add unit tests for existsById() method #4137

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2d95536
Add unit tests for existsById() method
GoToBILL Jan 3, 2026
3f4fb87
Improve test verification for existsById() tests
GoToBILL Jan 3, 2026
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37 changes: 37 additions & 0 deletions ...st/java/org/springframework/data/jpa/repository/support/SimpleJpaRepositoryUnitTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -26,11 +26,13 @@
import jakarta.persistence.TypedQuery;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.metamodel.SingularAttribute;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.stream.Stream;
import java.util.List;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
Expand Down Expand Up @@ -80,6 +82,7 @@ class SimpleJpaRepositoryUnitTests {
@Mock CrudMethodMetadata metadata;
@Mock EntityGraph<User> entityGraph;
@Mock org.springframework.data.jpa.repository.EntityGraph entityGraphAnnotation;
@Mock SingularAttribute idAttribute;

@BeforeEach
void setUp() {
Expand Down Expand Up @@ -262,4 +265,38 @@ static Stream<Arguments> modifyingMethods() {
private static String formatName(Method method) {
return method.toString().replaceAll("public ", "").replaceAll(SimpleJpaRepository.class.getName() + ".", "");
}

@Test // GH-4134
@SuppressWarnings({"unchecked"})
void existsByIdReturnsTrueWhenEntityExists() {

when(information.getIdAttribute()).thenReturn(idAttribute);
when(information.getEntityName()).thenReturn("User");
when(information.getIdAttributeNames()).thenReturn(List.of("id"));
when(information.hasCompositeId()).thenReturn(false);
when(em.createQuery(anyString(), eq(Long.class))).thenReturn(countQuery);
when(countQuery.getSingleResult()).thenReturn(1L);

boolean result = repo.existsById(1);

verify(countQuery).getSingleResult();
assertThat(result).isTrue();
}

@Test // GH-4134
@SuppressWarnings({"unchecked"})
void existsByIdReturnsFalseWhenEntityDoesNotExist() {

when(information.getIdAttribute()).thenReturn(idAttribute);
when(information.getEntityName()).thenReturn("User");
when(information.getIdAttributeNames()).thenReturn(List.of("id"));
when(information.hasCompositeId()).thenReturn(false);
when(em.createQuery(anyString(), eq(Long.class))).thenReturn(countQuery);
when(countQuery.getSingleResult()).thenReturn(0L);

boolean result = repo.existsById(1);

verify(countQuery).getSingleResult();
assertThat(result).isFalse();
}
}
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