Alex getaclue00

Automated Testing.

Testing is helpful for ensuring that your code runs (driver code). This is to make sure that current features work, old features still work, and future work will be easily tested. By default, every Rails application has three environments: development, test, and production.

Rails offers three kinds of testing:

Unit tests:  In the context of Rails, unit tests are meant primarily to cover the domain logic in your models, which include things like validations, calculations, search methods, and any other interesting functionality that your models implement.
Functional tests: These provide a way to verify that the actions for a single controller are working as expected, and allow you to do things such as post data to a specific action and verify the correct response is returned
Integration tests: Any given session with a Rails application will span across several models and controllers. Integration tests provide a way to test those kinds of interactions. Essentia

#Installing ngrok on OSX

Download ngrok
Unzip it to your Applications directory
Create a symlink (instructions below)

Creating a symlink to ngrok

Run the following two commands in Terminal to create the symlink.

# cd into your local bin directory

Creating a "DMG installer" for OS X

A DMG Installer is convenient way to provide end-users a simple way to install an application bundle. They are basically a folder with a shortcut to the Applications directory but they can be customized with icons, backgrounds, and layout properties. A DMG file (.dmg) is a Mac OS X Disk Image file and it is used to package files or folders providing compression, encryption, and read-only to the package.

##Creating the DMG file #Disk Utility


	// This extension is a port of @venj's solution from 2011
	// https://github.com/venj/Cocoa-blog-code/blob/master/Round%20Corner%20Image/Round%20Corner%20Image/NSImage%2BRoundCorner.m
	extension NSImage {

	func roundCorners(withRadius radius: CGFloat) -> NSImage {
	let rect = NSRect(origin: NSPoint.zero, size: size)
	if
	let cgImage = self.cgImage,
	let context = CGContext(data: nil,

	import Alamofire

	func makeGetCallWithAlamofire() {
	let todoEndpoint: String = "https://jsonplaceholder.typicode.com/todos/1"
	Alamofire.request(todoEndpoint)
	.responseJSON { response in
	// check for errors
	guard response.result.error == nil else {
	// got an error in getting the data, need to handle it
	print("error calling GET on /todos/1")

	#Works with Xcode 9 (Confirmed)

	#1. Go to "Edit Schemes"
	#2. Go to "Build"
	#3. Go to "Pre-Actions"
	#4. Select YOUR app in "Provide Build Settings from:"
	#5. Paste Below Script in Box
	#6. Build Project

	#Build Number ++

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	#########################
	# .gitignore file for Xcode4 and Xcode5 Source projects
	#
	# Apple bugs, waiting for Apple to fix/respond:
	#
	# 15564624 - what does the xccheckout file in Xcode5 do? Where's the documentation?
	#
	# Version 2.6
	# For latest version, see: http://stackoverflow.com/questions/49478/git-ignore-file-for-xcode-projects
	#

	//
	// Screenshot.swift
	//
	// 1) Take a picture of a UIView
	// 2) Take a picture of a UIView's subframe. EG. Fullscreen UIView with a
	// small square box in the middle, it will only save what's visible in the box frame
	// but not the box itself

	import Foundation
	import UIKit

	import AppKit

	struct ScreenshotManager {

	/// Matches macOS' screenshot filename format.
	private static let filenameFormatter: DateFormatter = {
	let formatter = DateFormatter()
	formatter.dateFormat = "'Screen Shot' yyyy-MM-dd 'at' HH.mm.ss"
	return formatter
	}()