add tests

Author: SirCotare

src/test/java/it/aboutbits/springboot/toolbox/web/response/PagedResponseTest.java

@@ -0,0 +1,98 @@
+package it.aboutbits.springboot.toolbox.web.response;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.PageRequest;
+
+import java.util.List;
+import java.util.function.Function;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class PagedResponseTest {
+    @Test
+    void shouldReturnPagedResponseWithDataAndMeta_forSingleParameterOfMethod() {
+        // given
+        var content = List.of("item1", "item2", "item3");
+        var page = new PageImpl<>(content, PageRequest.of(1, 3), 10);
+
+        // when
+        var pagedResponse = PagedResponse.of(page);
+
+        // then
+        assertThat(pagedResponse).isNotNull();
+        assertThat(pagedResponse.data()).isEqualTo(content);
+        assertThat(pagedResponse.meta().pagination().page()).isEqualTo(1);
+        assertThat(pagedResponse.meta().pagination().size()).isEqualTo(3);
+        assertThat(pagedResponse.meta().pagination().totalElements()).isEqualTo(10);
+    }
+
+    @Test
+    void shouldReturnPagedResponseWithMappedDataAndMeta_forTwoParameterOfMethod() {
+        // given
+        var content = List.of(1, 2, 3);
+        var page = new PageImpl<>(content, PageRequest.of(2, 5), 15);
+        Function<Integer, String> converter = Object::toString;
+
+        // when
+        var pagedResponse = PagedResponse.of(page, converter);
+
+        // then
+        assertThat(pagedResponse).isNotNull();
+        assertThat(pagedResponse.data()).isEqualTo(List.of("1", "2", "3"));
+        assertThat(pagedResponse.meta().pagination().page()).isEqualTo(2);
+        assertThat(pagedResponse.meta().pagination().size()).isEqualTo(5);
+        assertThat(pagedResponse.meta().pagination().totalElements()).isEqualTo(15);
+    }
+
+    @Test
+    void shouldHandleEmptyPageCorrectly() {
+        // given
+        var page = new PageImpl<>(List.of(), PageRequest.of(0, 10), 0);
+
+        // when
+        var pagedResponse = PagedResponse.of(page);
+
+        // then
+        assertThat(pagedResponse).isNotNull();
+        assertThat(pagedResponse.data()).isEmpty();
+        assertThat(pagedResponse.meta().pagination().page()).isZero();
+        assertThat(pagedResponse.meta().pagination().size()).isEqualTo(10);
+        assertThat(pagedResponse.meta().pagination().totalElements()).isZero();
+    }
+
+    @Test
+    void shouldHandlePageWithCustomConverterCorrectly() {
+        // given
+        var content = List.of(10, 20, 30);
+        var page = new PageImpl<>(content, PageRequest.of(3, 3), 24);
+        Function<Integer, String> converter = val -> "Value-" + val;
+
+        // when
+        var pagedResponse = PagedResponse.of(page, converter);
+
+        // then
+        assertThat(pagedResponse).isNotNull();
+        assertThat(pagedResponse.data()).isEqualTo(List.of("Value-10", "Value-20", "Value-30"));
+        assertThat(pagedResponse.meta().pagination().page()).isEqualTo(3);
+        assertThat(pagedResponse.meta().pagination().size()).isEqualTo(3);
+        assertThat(pagedResponse.meta().pagination().totalElements()).isEqualTo(24);
+    }
+
+    @Test
+    void shouldHandleEmptyPageWithCustomConverterCorrectly() {
+        // given
+        var page = new PageImpl<Integer>(List.of(), PageRequest.of(2, 4), 0);
+        Function<Integer, String> converter = val -> "Value-" + val;
+
+        // when
+        var pagedResponse = PagedResponse.of(page, converter);
+
+        // then
+        assertThat(pagedResponse).isNotNull();
+        assertThat(pagedResponse.data()).isEmpty();
+        assertThat(pagedResponse.meta().pagination().page()).isEqualTo(2);
+        assertThat(pagedResponse.meta().pagination().size()).isEqualTo(4);
+        assertThat(pagedResponse.meta().pagination().totalElements()).isZero();
+    }
+}