Approve acronym when using scan

Author: kntsoriano

lib/analyzers/acronym/analyze.rb

@@ -3,7 +3,7 @@ class Analyze < ExerciseAnalyzer
     include Mandate
 
     def analyze!
-      if solution.uses_method_chain?
+      if solution.uses_method_chain? || solution.uses_scan?
         self.status = :approve
 
         raise FinishedFlowControlException

lib/analyzers/acronym/representation.rb

@@ -16,6 +16,18 @@ def uses_method_chain?
                               :upcase)
     end
 
+    def uses_scan?
+      target_method.body == s(:send,
+                              s(:send,
+                                s(:send,
+                                  s(:lvar, :words),
+                                  :scan,
+                                  s(:regexp, s(:str, "\\b[[:alpha:]]"), s(:regopt))
+                                ),
+                                :join),
+                              :upcase)
+    end
+
     private
     memoize
     def target_method

test/exercises/acronym_test.rb

@@ -14,4 +14,17 @@ def self.abbreviate(words)
     assert_equal :approve, results[:status]
     assert_equal [], results[:comments]
   end
+
+  def test_scan_passes
+    source = %q{
+      class Acronym
+        def self.abbreviate(words)
+          words.scan(/\b[[:alpha:]]/).join.upcase
+        end
+      end
+    }
+    results = Acronym::Analyze.(source)
+    assert_equal :approve, results[:status]
+    assert_equal [], results[:comments]
+  end
 end