first

__tests__/App.test.tsx

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+/**
+ * @format
+ */
+
+import React from 'react';
+import ReactTestRenderer from 'react-test-renderer';
+import App from '../App';
+
+test('renders correctly', async () => {
+  await ReactTestRenderer.act(() => {
+    ReactTestRenderer.create(<App />);
+  });
+});

__tests__/multiply.test.js

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+import multiply from "../multiply"
+
+describe ("multiply group",() => {
+    test("multiply of 2 and 3 is 6", () => {
+        const mult = multiply(2,3);
+        expect(mult).toBe(6)
+    });
+    test("multiply of 6 and 3 is 18", () => {
+        const mult = multiply(6,3);
+        expect(mult).toBe(18)
+    })
+})

__tests__/subtraction.test.js

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+import subtraction from "../testing/subtraction";
+
+describe ("subtraction group",() => {
+    test("multiply of 6 and 1 is 5", () => {
+        const subt = subtraction(6,1);
+        expect(subt).toBe(5)
+    });
+    test("subtraction of 6 and 3 is 3", () => {
+        const subt = subtraction(6,3);
+        expect(subt).toBe(3)
+    })
+     it("subtraction of 6 and 7 is -1", () => {
+        const subt = subtraction(6,7);
+        expect(subt).toBe(-1)
+    })
+})