add Mapper test - category package complete now

server/src/main/java/org/hyperskill/community/flashcards/category/mapper/CategoryMapper.java

@@ -13,6 +13,7 @@
 @Slf4j
 public class CategoryMapper {
     private final String currentUserName;
+
     public CategoryMapper(String currentUserName) {
         Objects.requireNonNull(currentUserName, "Username cannot be null");
         this.currentUserName = currentUserName;

server/src/test/java/org/hyperskill/community/flashcards/category/CategoryMapperTest.java

@@ -0,0 +1,48 @@
+package org.hyperskill.community.flashcards.category;
+
+import org.hyperskill.community.flashcards.category.mapper.CategoryMapper;
+import org.hyperskill.community.flashcards.category.model.Category;
+import org.hyperskill.community.flashcards.category.model.CategoryAccess;
+import org.hyperskill.community.flashcards.common.response.ActionType;
+import org.hyperskill.community.flashcards.common.response.PermittedAction;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class CategoryMapperTest {
+
+    CategoryMapper mapper;
+
+    @BeforeEach
+    void setUp() {
+        mapper = new CategoryMapper("user");
+    }
+
+    @Test
+    void permittedUser_mapsCorrectly() {
+        var category = createCategory("user", "rwd");
+        var dto = mapper.categoryToCategoryDto(category);
+        assertEquals(category.id(), dto.id());
+        assertEquals(category.name(), dto.name());
+        var expectedPermissions = Set.of(
+                new PermittedAction(ActionType.READ, "/api/categories/12345"),
+                new PermittedAction(ActionType.WRITE, "/api/categories/12345"),
+                new PermittedAction(ActionType.DELETE, "/api/categories/12345"));
+        assertEquals(expectedPermissions, dto.actions());
+    }
+
+    @Test
+    void notPermittedUser_mapThrows() {
+        var category = createCategory("other", "rw");
+        assertThrows(IllegalStateException.class, () -> mapper.categoryToCategoryDto(category));
+    }
+
+    private Category createCategory( String username, String permissions) {
+        return new Category("12345", "test", Set.of(new CategoryAccess(username, permissions)));
+    }
+
+}