Jeff

lab-jeff/.eslintignore

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+**/node_modules/*
+**/vendor/*
+**/*.min.js
+**/coverage/*
+**/build/*

lab-jeff/.eslintrc

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+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "commonjs": true,
+    "jest": true,
+    "es6": true
+  },
+  "globals": {
+    "err": true,
+    "req": true,
+    "res": true,
+    "next": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
+    "comma-dangle": ["error", "always-multiline"],
+    "semi": [ "error", "always" ]
+  }
+}

lab-jeff/.gitignore

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+# Created by https://www.gitignore.io/api/osx,vim,node,linux,windows,visualstudiocode
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+
+### OSX ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Vim ###
+# swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-v][a-z]
+[._]sw[a-p]
+# session
+Session.vim
+# temporary
+.netrwhist
+# auto-generated tag files
+tags
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.gitignore.io/api/osx,vim,node,linux,windows,visualstudiocode

lab-jeff/README.md

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+# Code 401 lab 1
+
+## Purpose
+The purpose of this lab is to learn Test Driven Development (TDD) when writing code.  We are using jest.js to test our code.
+
+## File Structure
+There are two test files in the __test__ folder which test the functions included in the two modules in the lib folder.
+
+## greet module
+The greet module contains one function, greet.hi().  
+
+### greet.hi
+greet.hi() expects one string as an argument.  When invoked with a string, it returns 'hello <string>'.  When invoked with any non-string, null is returned.
+
+## arithmetic module
+The arithmetic module contains two functions, Arithmetic.add() and Arithmetic.sub().
+
+### arithmetic.add
+This function takes two arguments.  If they are numbers, it returns the sum of those numbers.  If either argument is not a number, it returns null.
+
+### arithmetic.sub
+This function takes two arguments.  If they are numbers, it returns the second parameter subtracted from the first.  If either argument is not a number, it returns null.

lab-jeff/__test__/arithmetic.test.js

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+'use strict';
+
+const arithmetic = require('../lib/arithmetic');
+
+describe('arithmetic.test.js', () => {
+  describe('arithmetic.add', () => {
+    test('arithmetic.add(a, b) should return the sum of a and b', () => {
+      expect(arithmetic.add(1, 2)).toEqual(3);
+      expect(arithmetic.add(5, 10)).toEqual(15);
+    });
+    test('if either parameter is not a number, arithmetic.add() should return null', () => {
+      expect(arithmetic.add('hi', 1)).toEqual(null);
+      expect(arithmetic.add(2, true)).toEqual(null);
+    });
+
+  });
+  describe('arithmetic.sub', () => {
+    test('arithmetic.sub(a, b) should return a minus b', () => {
+      expect(arithmetic.sub(1, 2)).toEqual(-1);
+      expect(arithmetic.sub(10, 5)).toEqual(5);
+    });
+    test('if either parameter is not a number, arithmetic.sub() returns null', () => {
+      expect(arithmetic.sub('hi', 1)).toEqual(null);
+      expect(arithmetic.sub(2, true)).toEqual(null);
+    });
+
+  });
+});

lab-jeff/__test__/greet.test.js

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+'use strict';
+
+const greet = require('../lib/greet');
+
+describe('greet.test.js', () => {
+  describe('greet.hi', () => {
+    test('greet.hi(<name>) should return "Hello, <name>!"', () => {
+      expect(greet.hi('world')).toEqual('hello world');
+    });
+    test('greet.hi should return null if input is not a string', () => {
+      expect(greet.hi(true)).toEqual(null);
+
+    });
+  });
+});

lab-jeff/lib/arithmetic.js

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+'use strict';
+
+const arithmetic = module.exports = {};
+
+arithmetic.add = (a, b) => {
+  if (typeof a !== 'number' || typeof b !== 'number') return null;
+  return a + b;
+};
+
+arithmetic.sub = (a, b) => {
+  if (typeof a !== 'number' || typeof b !== 'number') return null;
+  return a - b;
+};

lab-jeff/lib/greet.js

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+'use strict';
+
+const greet = module.exports = {};
+
+greet.hi = (name) => {
+  if (typeof name !== 'string') return null;
+  return `hello ${name}`;
+};