Add pagination state equality and hashcode, add tests

lib/pagination/pagination_state.dart

@@ -1,4 +1,7 @@
+import 'package:flutter/foundation.dart';
+
 /// State for pagination.
+@immutable
 class PaginationState<T> {
   /// Creates a new [PaginationState] with the given values.
   const PaginationState({
@@ -61,4 +64,33 @@ class PaginationState<T> {
       searchQuery: searchQuery ?? this.searchQuery,
     );
   }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is PaginationState<T> &&
+        listEquals(other.items, items) &&
+        other.currentPage == currentPage &&
+        other.lastPage == lastPage &&
+        other.isLoading == isLoading &&
+        other.loadingInitialPage == loadingInitialPage &&
+        other.hasError == hasError &&
+        other.total == total &&
+        other.searchQuery == searchQuery;
+  }
+
+  @override
+  int get hashCode {
+    return Object.hashAll([
+      Object.hashAll(items),
+      currentPage,
+      lastPage,
+      isLoading,
+      loadingInitialPage,
+      hasError,
+      total,
+      searchQuery,
+    ]);
+  }
 }

test/pagination/pagination_mixin_test.dart

@@ -20,8 +20,10 @@ void main() {
         [-1, 1, true],
         [1, 2, true],
       ],
-      (int currentPage, int lastPage, bool expected) =>
-          expect(PaginationState<int>(items: [], currentPage: currentPage, lastPage: lastPage).hasNextPage, expected),
+      (int currentPage, int lastPage, bool expected) => expect(
+        PaginationState<int>(items: const [], currentPage: currentPage, lastPage: lastPage).hasNextPage,
+        expected,
+      ),
     );
   });
 

test/pagination/pagination_state_test.dart

@@ -0,0 +1,117 @@
+import 'package:dcc_toolkit/pagination/pagination_state.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('PaginationState', () {
+    group('hasNextPage', () {
+      test('returns true when current page is less than last page', () {
+        const state = PaginationState<String>(currentPage: 2, lastPage: 5);
+
+        expect(state.hasNextPage, true);
+      });
+
+      test('returns false when current page equals last page', () {
+        const state = PaginationState<String>(currentPage: 5, lastPage: 5);
+
+        expect(state.hasNextPage, false);
+      });
+
+      test('returns false when current page is greater than last page', () {
+        const state = PaginationState<String>(currentPage: 6, lastPage: 5);
+
+        expect(state.hasNextPage, false);
+      });
+    });
+
+    group('equality', () {
+      test('returns true for identical instances', () {
+        const state = PaginationState<String>();
+
+        expect(state == state, true);
+        expect(state.hashCode == state.hashCode, true);
+      });
+
+      test('returns true for instances with same values', () {
+        const items = ['item1', 'item2'];
+        const state1 = PaginationState<String>(
+          items: items,
+          currentPage: 2,
+          lastPage: 5,
+          isLoading: true,
+          loadingInitialPage: false,
+          hasError: true,
+          total: 50,
+          searchQuery: 'test',
+        );
+        const state2 = PaginationState<String>(
+          items: items,
+          currentPage: 2,
+          lastPage: 5,
+          isLoading: true,
+          loadingInitialPage: false,
+          hasError: true,
+          total: 50,
+          searchQuery: 'test',
+        );
+
+        expect(state1 == state2, true);
+        expect(state1.hashCode == state2.hashCode, true);
+      });
+
+      test('returns false for instances with different items', () {
+        const state1 = PaginationState<String>(items: ['item1']);
+        const state2 = PaginationState<String>(items: ['item2']);
+
+        expect(state1 == state2, false);
+        expect(state1.hashCode == state2.hashCode, false);
+      });
+
+      test('returns false for instances with different currentPage', () {
+        const state1 = PaginationState<String>();
+        const state2 = PaginationState<String>(currentPage: 2);
+
+        expect(state1 == state2, false);
+        expect(state1.hashCode == state2.hashCode, false);
+      });
+
+      test('returns false for instances with different lastPage', () {
+        const state1 = PaginationState<String>(lastPage: 3);
+        const state2 = PaginationState<String>(lastPage: 5);
+
+        expect(state1 == state2, false);
+        expect(state1.hashCode == state2.hashCode, false);
+      });
+
+      test('returns false for instances with different isLoading', () {
+        const state1 = PaginationState<String>(isLoading: true);
+        const state2 = PaginationState<String>();
+
+        expect(state1 == state2, false);
+        expect(state1.hashCode == state2.hashCode, false);
+      });
+
+      test('returns false for instances with different loadingInitialPage', () {
+        const state1 = PaginationState<String>();
+        const state2 = PaginationState<String>(loadingInitialPage: false);
+
+        expect(state1 == state2, false);
+        expect(state1.hashCode == state2.hashCode, false);
+      });
+
+      test('returns false for instances with different hasError', () {
+        const state1 = PaginationState<String>(hasError: true);
+        const state2 = PaginationState<String>();
+
+        expect(state1 == state2, false);
+        expect(state1.hashCode == state2.hashCode, false);
+      });
+
+      test('returns false for instances with different generic types', () {
+        const stringState = PaginationState<String>();
+        const intState = PaginationState<int>();
+
+        expect(stringState.runtimeType == intState.runtimeType, false);
+      });
+    });
+  });
+}