added test/function for any string

code now returns "I need to know how many bottles to sing!" if input was a string

Author: bebepeng

bin/beer_on_the_wall.rb

@@ -1,10 +1,11 @@
 puts "How many bottles?"
 
 beer = gets.chomp
-if beer == ""
+beer_as_int = beer.to_i
+if beer != beer_as_int.to_s
   puts "I need to know how many bottles to sing!"
 else
-  beer = Integer(beer)
+    beer=beer.to_i
 end
 
 def firstBeer(be)

spec/beer_on_the_wall_spec.rb

@@ -50,4 +50,12 @@
     expect(all_output).to_not include("1 bottle of beer on the wall, 1 bottle of beer.\nTake one down and pass it around, no bottles of beer on the wall.\n")
   end
 
+  it "throws an error if it does not know how many number of bottles" do
+    run_script("beer_on_the_wall.rb")
+    type("no")
+
+    expect(all_output).to match("I need to know how many bottles to sing!")
+    expect(all_output).to_not include("1 bottle of beer on the wall, 1 bottle of beer.\nTake one down and pass it around, no bottles of beer on the wall.\n")
+  end
+
 end