init

enhancer/enhancer.js

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+function success(item) {}
+
+function fail(item) {
+  if (item.enhancement < 15 && item.durability < 25) {
+    return { ...item };
+  }
+  const durability =
+    item.enhancement < 15 ? item.durability - 5 : item.durability - 10;
+
+  return { ...item, durability };
+}
+function repair(item) {
+  return { ...item, durability: 100 };
+}
+
+module.exports = {
+  repair,
+  success,
+  fail,
+};

enhancer/enhancer.spec.js

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+const { success, repair, fail } = require('../enhancer/enhancer');
+
+const item = {
+  name: 'sword',
+  type: 'weapon',
+  durability: 100,
+  enhancement: 17,
+  displayName: 'banana',
+};
+describe('enhancer', () => {
+  describe('fail()', () => {
+    it('durability decreases by 5 if enhanced is between 0 and 14', () => {
+      expect(fail({ enhancement: 14, durability: 85 }).durability).toBe(80);
+    });
+    it('durability decreases by 10 if greater than 14', () => {
+      //Arrange(setup)
+      const item = {
+        enhancement: 15,
+        durability: 85,
+      };
+      //Act - execute the system under test(SUT)
+      const actual = fail(item);
+      //Assert
+      expect(actual.durability).toBe(75);
+    });
+    it('If enhancement is 14 or lower, the item cannot be enhanced if the durability is below 25', () => {
+      const item = {
+        enhancement: 14,
+        durability: 24,
+      };
+      expect(fail(item)).toEqual(item);
+    });
+  });
+
+  //Repair
+  describe('repair()', () => {
+    it('sets durability to 100', () => {
+      expect(repair(item).durability).toEqual(100);
+    });
+  });
+  // //Success
+  // describe('Enhancement Success', () => {
+  //   it('enhancement success', () => {
+  //     expect(success(item).enhancement).toBe(17);
+  //     console.log(item);
+  //   });
+  // });
+});

package.json

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+{
+  "name": "testing-i",
+  "version": "1.0.0",
+  "description": "In this project, you will demonstrate proficiency by writing unit tests and production code to satisfy the _Minimum Viable Product_ described below.",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest --watch --verbose"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Blent1050/testing-i.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/Blent1050/testing-i/issues"
+  },
+  "homepage": "https://github.com/Blent1050/testing-i#readme",
+  "dependencies": {
+    "jest": "^24.1.0"
+  }
+}