Update invert.test.js

Author: joanne342

Sprint-2/interpret/invert.test.js

@@ -1 +1,46 @@
+const invert = require("./invert.js");
 
+/*
+Implement a function called invert that swaps the keys and values of an object.
+
+E.g. invert({ x: 10, y: 20 })
+// returns { "10": "x", "20": "y" }
+*/
+
+// Acceptance criteria:
+
+// Given an empty object
+// When passed to invert
+// Then it should return an empty object
+test("returns an empty object when given an empty object", () => {
+  expect(invert({})).toEqual({});
+});
+
+// Given an object with one property
+// When passed to invert
+// Then it should swap the key and value
+test("inverts an object with one key-value pair", () => {
+  expect(invert({ a: 1 })).toEqual({
+    "1": "a",
+  });
+});
+
+// Given an object with multiple properties
+// When passed to invert
+// Then it should swap all keys and values
+test("inverts an object with multiple key-value pairs", () => {
+  expect(invert({ a: 1, b: 2 })).toEqual({
+    "1": "a",
+    "2": "b",
+  });
+});
+
+// Given an object with string values
+// When passed to invert
+// Then it should swap the keys and values
+test("inverts string values correctly", () => {
+  expect(invert({ first: "apple", second: "banana" })).toEqual({
+    apple: "first",
+    banana: "second",
+  });
+});