Specify files and add testing

src/calculator/calculator.test.ts

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+import Calculator from './calculator'
+
+test('adds 2 + 3 to equal 5', () => {
+  const calc = new Calculator()
+  expect(calc.add(2, 3)).toBe(5);
+});
+
+test('subtracts 2 - 3 to equal -1', () => {
+  const calc = new Calculator()
+  expect(calc.subtract(2, 3)).toBe(-1);
+});

src/calculator/calculator.ts

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+export default class Calculator {
+
+  add(x : number, y : number) : number {
+    return x + y;
+  }
+
+  subtract(x: number, y: number) : number {
+    return x - y;
+  }
+}

src/index/index.test.ts

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+import Index from "./index";
+
+test('test uncovered if', () => {
+  const indexObj = new Index();
+  expect(indexObj.uncovered_if()).toEqual(false);
+});
+
+test('fully covered', () => {
+  const indexObj = new Index();
+  expect(indexObj.fully_covered()).toEqual(true);
+});

src/index/index.ts

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+export default class Index {
+
+  //This function is tested and part of it is uncovered
+  uncovered_if = (a = true) => {
+    if (a == true) {
+      return false
+    } else {
+      return true
+    }
+  }
+
+  //This function will be fully covered
+  fully_covered = () => {
+    return true
+  }
+
+  //This function will not be tested by unit tests
+  uncovered = () => {
+    return true
+  }
+}