1 files changed, 5 insertions, 5 deletions
diff --git a/spec/data_structures/binary_tree_spec.rb b/spec/data_structures/binary_tree_spec.rb
index 350ddc4..348be6f 100644
--- a/spec/data_structures/binary_tree_spec.rb
+++ b/spec/data_structures/binary_tree_spec.rb
@@ -4,27 +4,27 @@ require "spec_helper"
 #each node has at most two children
 #nodes with children are parent nodes.
 describe BinaryTree do
-  let(:sut) { BinaryTree.new }
+  subject { BinaryTree.new }
 
   context "when there are no items in the tree" do
     it "should have a size of 0" do
-      expect(sut.size).to eq(0)
+      expect(subject.size).to eq(0)
     end
   end
 
   context "when many items are pushed on to the tree" do
     before :each do
       10.times do |n|
-        sut.push(rand(n))
+        subject.push(rand(n))
       end
     end
 
     it "should increase the size" do
-      expect(sut.size).to eq(10)
+      expect(subject.size).to eq(10)
     end
 
     it "can iterate through each item" do
-      sut.each do |item|
+      subject.each do |item|
         expect(item).not_to be_nil
       end
     end