Desarrollo de kata : Enero-String.Calculator

mcalaguap/StringCalculator.rb

@@ -0,0 +1,28 @@
+class StringCalculator
+	def Add(string)
+		if (string == "")
+			0
+		else
+			negative = []
+			delim = "\n"
+			sum = 0
+			if string.start_with? "//"
+				delim = string[2].chr
+				string = string.split("\n")[1]
+			elsif string.include? ","
+				delim = ","
+			end
+			string.split(delim).each { |n|
+				if n.to_i < 0
+					negative << n
+				end
+				sum+=n.to_i 
+			}
+			if negative.empty?
+				sum
+			else
+				raise "negative numbers are not allowed #{negative.join(",")}"
+			end
+		end
+	end
+end

mcalaguap/StringCalculator_spec.rb

@@ -0,0 +1,68 @@
+
+require './StringCalculator'
+
+describe "StringCalculator" do
+
+	context "Cadena Vacia" do
+		it "Retorna 0 si  parametro es vacio" do
+			sc = StringCalculator.new
+			sc.Add("").should == 0
+		end
+	end
+
+	context "Para un Numero" do
+		it "Retorna el numero cero" do
+			sc = StringCalculator.new
+			sc.Add("0").should == 0
+		end
+		it "Retorna el numero uno" do
+			sc = StringCalculator.new
+			sc.Add("1").should == 1
+		end
+		it "Retorna el numero 123456" do
+			sc = StringCalculator.new
+			sc.Add("123456").should == 123456
+		end
+	end
+
+	context "Dos o mas numeros" do
+		it "Retorna 1+2=3" do
+			sc = StringCalculator.new
+			sc.Add("1,2").should == 3
+		end
+		it "Trabaja con 10 numeros" do
+			sc = StringCalculator.new
+			sc.Add("1,2,3,4,5,6,7,8,9,10")
+		end
+	end
+
+	context "Salto de linea en lugar de , para separar los numeros" do
+		it "Retorna 20+20=40" do
+			sc = StringCalculator.new
+			sc.Add("20\n20").should == 40
+		end
+	end
+
+	context "Cualquier delimitador" do
+		it "Trabaja con ; y retrona 40" do
+			sc = StringCalculator.new
+			sc.Add("//;\n20;20").should == 40
+		end
+		it "Trabaja con culquiera como el caracter H" do
+			sc = StringCalculator.new
+			sc.Add("//H\n20H20").should == 40
+		end
+	end
+
+	context "Numero negativos no permitidos" do
+		it "Saltar excepcion con un numero negativo" do
+			sc = StringCalculator.new
+			expect{ sc.Add("//;\n20;-20") }.to raise_error "negative numbers are not allowed -20"
+		end
+		it "Saltar excepcion con N numeros negativo" do
+			sc = StringCalculator.new
+			expect{ sc.Add("//;\n1;-2;3;-4;5;-6;7;-8;9;-10") }.to raise_error "negative numbers are not allowed -2,-4,-6,-8,-10"
+		end
+	end
+
+end