Update some of the exercises

examples/basic-math/src/arithmetic.test.js

@@ -0,0 +1,9 @@
+import { describe, it, expect } from 'vitest';
+
+describe.todo('add', () => {});
+
+describe.todo('subtract', () => {});
+
+describe.todo('multiply', () => {});
+
+describe.todo('divide', () => {});

examples/basic-math/src/calculator.test.ts

@@ -1 +0,0 @@
-import { describe, it, expect } from 'vitest';

examples/basic-math/src/counter.js

@@ -0,0 +1,16 @@
+let value = 0;
+
+export const counter = {
+  get value() {
+    return value;
+  },
+  increment() {
+    value++;
+  },
+  decrement() {
+    value--;
+  },
+  reset() {
+    value = 0;
+  },
+};

examples/basic-math/src/counter.test.js

@@ -0,0 +1,21 @@
+import { expect, it, describe } from 'vitest';
+import { counter } from './counter';
+
+// For added fun, we can try `describe.shuffle`.
+describe.todo('Counter', () => {
+  it('starts at zero', () => {
+    expect(counter.value).toBe(0);
+  });
+
+  it('can increment', () => {
+    counter.increment();
+    expect(counter.value).toBe(1);
+  });
+
+  // Let's get this test to *not* fail.
+  it('can decrement', () => {
+    counter.increment();
+    counter.decrement();
+    expect(counter.value).toBe(0);
+  });
+});