Merge branch 'master' of https://github.com/tocalai/Ruby-Lab

Author: Danny_Lai

README.md

@@ -0,0 +1,81 @@
+# Ruby-Lab
+
+- Build the Ruby development environment via **Visual studio code** with extension [Ruby](https://github.com/rubyide/vscode-ruby)
+- For the **BDD** (Behaviour Drive Development) purpose, download and installed [RSpec](http://rspec.info/)
+
+1. First we created empty class called: *Account* inside the account.rb
+```sh
+class Account
+end
+```
+2. Then we created our first test scenario inside the account_spec.rb
+> The testing target aim for *Account* class
+```sh
+RSpec.describe Account do
+end
+```
+3. We need initilize our account object under the *constructor*
+> So before we startup our testing case, we need create new account object that passing account identity and balance while account first open
+```sh
+RSpec.describe Account do
+  before(:all) do
+          @inital_balance = 100_100
+          @test_account = Account.new('TestAccount1', @inital_balance)
+   end
+end
+```
+4. Let's run the test case and you  might get red light(or failed) 
+> Cause we did not implement constructor inside the account.rb yet
+```sh
+class Account
+   def initialize(name, balance = 0)
+    @name = name
+    @balance = balance
+  end
+end
+```
+5. Now turned back to account_spec.rb and performed the testing, we might get rid of error, means that we got green light
+> For the next step, started to write the first feature of test case, for exmaple: *desposit*
+```sh
+RSpec.describe Account do
+  before(:all) do
+          @inital_balance = 100_100
+          @test_account = Account.new('TestAccount1', @inital_balance)
+   end
+   describe ".desposit" do
+       context 'When transaction amount <= 0' do
+            it 'Should return intput amount [x] invalid' do
+                @trans =  TransactionItem.new(Time.new, -1, DESPOSIT, 'Desposit invalid test')
+                @result = @test_account.desposit(@trans)
+                expect(@result).to eq INVALIDINPUT
+            end
+        end
+   end
+end
+```
+6. Again triggered the test case, red light return
+> Go back to account.rb and implement the detail of desposit method and created the new class *TranasctionItem*...
+```sh
+class Account
+  #....
+  def desposit(trans)
+      if trans.amount <= 0
+        puts "Input amount '#{trans.amount}' invalid"
+        return INVALIDINPUT
+      end
+  end
+end
+
+class TransactionItem
+  attr_reader :date, :amount, :memo, :code
+
+  def initialize(date, amount, code, memo)
+    @date = date
+    @amount = amount
+    @code = code
+    @memo = memo
+  end
+end
+```
+7. Tried to finish the test case and let it become green light, iterator the process till the user requriement all meet:) 
+> Test case -> red light -> implment detail -> green light -> back to test case