allolex · October 13, 2015 20:10 · Oct 13, 2015
diff --git a/tdd_methods.rb b/tdd_methods.rb
@@ -0,0 +1,51 @@
+def add_two(number = 0, *rest)
+  return nil unless number.respond_to? :+
+
+  # if number.respond_to? :+
+    if number.respond_to? :concat
+      puts "srsly?" if rest.size > 0
+      if number.respond_to? :push
+        number.push 2
+      else
+        number.concat "2"
+      end
+    else
+      rest << number
+      rest_sum = 0
+      rest.each do |num|
+        rest_sum += num
+      end
+      2 + rest_sum
+    end
+  # end
+end
+
+def add_five number
+  # …
+end
+
+def test_add_two
+  p add_two(2) == 4
+  p add_two(1) == 3
+  p add_two(1.0) == 3.0
+  p add_two("a") == "a2"
+  p add_two([]) == [2]
+  p add_two([1]) == [1,2]
+  p add_two({}) == nil
+  p add_two(nil) == nil
+  p add_two(true) == nil
+  p add_two == 2
+  p add_two(1,2) == 5
+  p add_two("a", "b")
+end
+
+def test_add_five
+  # test with expectation for add_five
+end
+
+def test_all
+  test_add_two
+  test_add_five
+end
+
+test_all