Merge branch 'main' of https://github.com/andreasalstrup/CoShare into…

… GroupScreen

__tests__/unitTests/CalculateBalance.test.ts

@@ -0,0 +1,60 @@
+import { calculateBalance, Expense } from '../../helpers/calculateBalance';
+
+describe('calculateBalance', () => {
+    it('should handle no balances', () => {
+        const result = calculateBalance([]);
+        expect(result).toEqual([]);
+    });
+
+    it('should handle a single user balance', () => {
+        const expenses: Expense[] = [
+            { user: 'Alice', amount: 50 },
+        ];
+        const expectedBalance: Expense[] = [
+            { user: 'Alice', amount: 0 }
+        ];
+        const result = calculateBalance(expenses);
+        expect(result).toEqual(expect.arrayContaining(expectedBalance));
+    });
+
+    it('should handle multiple user balances', () => {
+        const expenses: Expense[] = [
+            { user: 'Alice', amount: 50 },
+            { user: 'Bob', amount: 0 },
+        ];
+        const expectedBalance: Expense[] = [
+            { user: 'Alice', amount: 25 },
+            { user: 'Bob', amount: -25 },
+        ];
+        const result = calculateBalance(expenses);
+        expect(result).toEqual(expect.arrayContaining(expectedBalance));
+    });
+
+    it('should handle multiple users with no balance', () => {
+        const expenses: Expense[] = [
+            { user: 'Alice', amount: 0 },
+            { user: 'Bob', amount: 0 },
+            { user: 'Charlie', amount: 0 },
+        ];
+        const expectedBalance: Expense[] = [
+            { user: 'Alice', amount: 0 },
+            { user: 'Bob', amount: 0 },
+            { user: 'Charlie', amount: 0 },
+        ];
+        const result = calculateBalance(expenses);
+        expect(result).toEqual(expect.arrayContaining(expectedBalance));
+    });
+
+    it('should handle large numbers', () => {
+        const expenses: Expense[] = [
+            { user: 'Alice', amount: Number.MAX_VALUE },
+            { user: 'Bob', amount: 0 },
+        ];
+        const expectedBalance: Expense[] = [
+            { user: 'Alice', amount: Number.MAX_VALUE/2 },
+            { user: 'Bob', amount: -Number.MAX_VALUE/2 },
+        ];
+        const result = calculateBalance(expenses);
+        expect(result).toEqual(expect.arrayContaining(expectedBalance));
+    });
+});

helpers/calculateBalance.tsx

@@ -1,4 +1,4 @@
-type Expense = {
+export type Expense = {
     user: string;
     amount: number;
 };