Parameterize Method.

parameterize-method/lib/after.rb

@@ -0,0 +1,11 @@
+class Student
+  GRADES = {
+    first: 10,
+    second: 11,
+    third: 12
+  }
+
+  def term_grade index
+    GRADES[index]
+  end
+end

parameterize-method/lib/before.rb

@@ -0,0 +1,13 @@
+class Student
+  def first_term_grade
+    10
+  end
+
+  def second_term_grade
+    11
+  end
+
+  def third_term_grade
+    12
+  end
+end

parameterize-method/test/test.rb

@@ -0,0 +1,33 @@
+require 'minitest/autorun'
+require 'minitest/spec'
+
+require 'before' if ENV["BEFORE"]
+require 'after' unless ENV["BEFORE"]
+
+describe Student do
+  if ENV["BEFORE"]
+
+    it "has a first grade" do
+      Student.new.first_term_grade.must_equal 10
+    end
+    it "has a second grade" do
+      Student.new.second_term_grade.must_equal 11
+    end
+    it "has a third grade" do
+      Student.new.third_term_grade.must_equal 12
+    end
+
+  else # AFTER
+
+    it "has a first grade" do
+      Student.new.term_grade(:first).must_equal 10
+    end
+    it "has a second grade" do
+      Student.new.term_grade(:second).must_equal 11
+    end
+    it "has a third grade" do
+      Student.new.term_grade(:third).must_equal 12
+    end
+
+  end
+end