Add the example application for the lesson about running tests

[refs #6eadd6cad050]

Author: jfahrer

developing/testing_applications/.rspec

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+--require spec_helper

developing/testing_applications/Dockerfile

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+FROM ruby:2.4.3-alpine
+
+RUN apk add --no-cache \
+      build-base
+
+WORKDIR /tmp
+
+COPY Gemfile* ./
+RUN bundle install
+
+WORKDIR /app
+
+ENV PATH=./bin:$PATH
+
+CMD ["client"]

developing/testing_applications/Gemfile

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+source "https://rubygems.org"
+
+gem 'activesupport'
+gem "rspec"

developing/testing_applications/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (5.1.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    coderay (1.1.2)
+    concurrent-ruby (1.0.5)
+    diff-lcs (1.3)
+    ffi (1.9.21)
+    formatador (0.2.5)
+    guard (2.14.2)
+      formatador (>= 0.2.4)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.9.12)
+      shellany (~> 0.0)
+      thor (>= 0.18.1)
+    guard-compat (1.2.1)
+    guard-rspec (4.7.3)
+      guard (~> 2.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
+    i18n (0.9.1)
+      concurrent-ruby (~> 1.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    lumberjack (1.0.12)
+    method_source (0.9.0)
+    minitest (5.10.3)
+    nenv (0.3.0)
+    notiffany (0.1.1)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
+    pry (0.11.3)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
+    ruby_dep (1.5.0)
+    shellany (0.0.1)
+    thor (0.20.0)
+    thread_safe (0.3.6)
+    tzinfo (1.2.4)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport
+  guard-rspec
+  rspec
+
+BUNDLED WITH
+   1.15.4

developing/testing_applications/app/anagram_checker.rb

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+require 'active_support/all'
+class AnagramChecker
+  def anagram?(a, b)
+    return false if a.blank? || b.blank?
+    a.to_s.split('').sort == b.to_s.split('').sort
+  end
+end

developing/testing_applications/app/client.rb

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+require './app/anagram_checker.rb'
+
+checker = AnagramChecker.new
+
+while (true)
+  print "Please input the first word: "
+  a = gets.chomp
+  print "Please enter the second word: "
+  b = gets.chomp
+
+  puts "Comparing words..."
+  if checker.anagram?(a, b)
+    puts "#{a}/#{b} is a valid anagram"
+  else
+    puts "#{a}/#{b} is NOT a valid anagram"
+  end
+  puts
+end

developing/testing_applications/bin/client

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+#!/bin/sh
+exec ruby app/client.rb

developing/testing_applications/docker-compose.override.yml

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+version: "3.4"
+
+services:
+  app:
+    command: tail -f /dev/null

developing/testing_applications/docker-compose.yml

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+version: "3.4"
+
+services:
+  app:
+    image: jfahrer/anagram_checker:latest
+    stdin_open: true
+    tty: true
+    build:
+      context: .
+    volumes:
+      - .:/app
+      - data
+
+volumes:
+  data:

developing/testing_applications/spec/anagram_checker_spec.rb

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+require 'spec_helper'
+require './app/anagram_checker'
+
+RSpec.describe AnagramChecker do
+  it 'identifies anagrams' do
+    checker = AnagramChecker.new
+    expect(checker.anagram?('julian', 'nailuj')).to be_truthy
+    expect(checker.anagram?('julian', 'julian')).to be_truthy
+    expect(checker.anagram?('julian', 'uijnla')).to be_truthy
+    expect(checker.anagram?('julian', 'iijnla')).to be_falsy
+    expect(checker.anagram?('julian', 'juliann')).to be_falsy
+  end
+
+  it 'handles nil cases' do
+    checker = AnagramChecker.new
+    expect(checker.anagram?('julian', nil)).to be_falsy
+    expect(checker.anagram?(nil, nil)).to be_falsy
+  end
+end