Chapter 8: draft code samples

Chapter08/testing-with-jest/test/test.js

@@ -0,0 +1,10 @@
+let uppercase = require("./../uppercase");
+
+describe("uppercase", () => {
+  test("uppercase hello returns HELLO", () => {
+    uppercase = jest.fn(() => "HELLO");
+    const result = uppercase("hello");
+    expect(uppercase).toHaveBeenCalledWith("hello");
+    expect(result).toBe("HELLO");
+  });
+});