Made tests for ItemOverview class

src/main/java/no/ntnu/idatt1002/demo/data/ItemOverview.java

@@ -39,6 +39,9 @@ public class ItemOverview {
      * @param newIncome   The Income you want to add.
      */
     public void addIncome(Income newIncome){
+        if(income.contains(newIncome)){
+            throw new IllegalArgumentException("This income is already registered");
+        }
         income.add(newIncome);
     }
 
@@ -47,6 +50,9 @@ public class ItemOverview {
      * @param newExpense   The Expense you want to add.
      */
     public void addExpense(Expense newExpense){
+        if(expense.contains(newExpense)){
+            throw new IllegalArgumentException("This expense is already registered");
+        }
         expense.add(newExpense);
     }
 

src/test/java/no/ntnu/idatt1002/demo/data/ItemOverviewTest.java

+package no.ntnu.idatt1002.demo.data;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ItemOverviewTest {
+    ItemOverview itemOverview;
+    @BeforeEach
+    public void makeItemOverview(){
+        itemOverview = new ItemOverview();
+    }
+    @Test
+    @DisplayName("addIncome method throws exception when it should")
+    void addIncomeThrows(){
+        itemOverview.addIncome(new Income("description", 59.9f, false, IncomeCategory.SALARY, "03.03.23"));
+        itemOverview.addIncome(new Income("description", 59.9f, false, IncomeCategory.SALARY, "03.03.23"));
+    }
+
+    @Test
+    @DisplayName("addExpense method throws exception when it should")
+    void addExpenseThrows(){
+        itemOverview.addExpense(new Expense("description", 59.9f, false,  ExpenseCategory.BOOKS, "03.03.23"));
+        itemOverview.addExpense(new Expense("description", 59.9f, false,  ExpenseCategory.BOOKS, "03.03.23"));
+    }
+
+    @Test
+    @DisplayName("getTotalIncome method gives correct amount")
+    void getTotalIncomeCorrectAmount(){
+        itemOverview.addIncome(new Income("description1", 59.9f, false, IncomeCategory.SALARY, "03.03.23"));
+        itemOverview.addIncome(new Income("description2", 62.4f, true, IncomeCategory.GIFT, "01.02.21"));
+        itemOverview.addIncome(new Income("description3", 9.81f, false, IncomeCategory.SALARY, "05.07.23"));
+
+        double totalIncome = 59.9f + 62.4f + 9.81f;
+        assertEquals(Math.round(itemOverview.getTotalIncome()), Math.round(totalIncome));
+    }
+
+    @Test
+    @DisplayName("getTotalExpense method gives correct amount")
+    void getTotalExpenseCorrectAmount(){
+        itemOverview.addExpense(new Expense("description1", 59.9f, false,  ExpenseCategory.BOOKS, "03.03.23"));
+        itemOverview.addExpense(new Expense("description2", 78.2f, true,  ExpenseCategory.FOOD, "03.04.23"));
+        itemOverview.addExpense(new Expense("description3", 103.5f, true,  ExpenseCategory.OTHER, "07.03.23"));
+
+        double totalExpense = 59.9f + 78.2f + 103.5f;
+        assertEquals(Math.round(itemOverview.getTotalExpense()), Math.round(totalExpense));
+    }
+}