test: [unit] created count all posts service test

Author: joaov1ct0r

src/test/java/com/joaov1ct0r/restful_api_users_java/modules/users/services/posts/CountAllPostsServiceTest.java

@@ -0,0 +1,57 @@
+package com.joaov1ct0r.restful_api_users_java.modules.users.services.posts;
+
+import com.joaov1ct0r.restful_api_users_java.modules.posts.dtos.CountAllPostsDTO;
+import com.joaov1ct0r.restful_api_users_java.modules.posts.repositories.PostRepository;
+import com.joaov1ct0r.restful_api_users_java.modules.posts.services.CountAllPostsService;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.junit.jupiter.MockitoSettings;
+import org.mockito.quality.Strictness;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.PageRequest;
+import java.util.Collections;
+import static org.mockito.Mockito.when;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.anyString;
+import static org.mockito.Mockito.any;
+
+@ExtendWith(MockitoExtension.class)
+@MockitoSettings(strictness = Strictness.LENIENT)
+public class CountAllPostsServiceTest {
+    @InjectMocks
+    private CountAllPostsService sut;
+
+    @Mock
+    private PostRepository postRepository;
+
+    @BeforeEach
+    public void beforeEachSetUp() {
+        Mockito.reset(this.postRepository);
+    }
+
+    @Test
+    @DisplayName("Should be able to count all posts")
+    public void shouldBeAbleToCountAllPosts() {
+        CountAllPostsDTO query = new CountAllPostsDTO(
+                20,
+                1,
+                "any_content"
+        );
+        when(
+                this.postRepository.countByContentContaining(
+                        anyString(),
+                        any(PageRequest.class)
+                )
+        ).thenReturn(new PageImpl<>(Collections.emptyList()));
+
+        long total = this.sut.execute(query);
+
+        assertThat(total).isEqualTo(0);
+    }
+}