use let instead of before

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>

test/unit/plugins_v1_backend_file_test.rb

@@ -1,33 +1,30 @@
 require 'helper'
 
 describe 'Vulcano::Plugins::Backend::FileCommon' do
-  before do
-    @backend = Vulcano::Plugins::Backend::FileCommon
-    @test = @backend.new
-  end
+  let(:cls) { Vulcano::Plugins::Backend::FileCommon }
+  let(:backend) { cls.new }
 
   it 'default type is :unkown' do
-    @test.type.must_equal :unknown
+    backend.type.must_equal :unknown
   end
 
   describe 'with non-empty content' do
-    before do
-      @content = 'Hello World'
-      @test = Class.new(@backend) do
+    let(:backend) {
+      Class.new(cls) do
         def content; 'Hello World'; end
       end.new
-    end
+    }
 
     it 'must return raw content' do
-      @test.content.must_equal @content
+      backend.content.must_equal 'Hello World'
     end
 
     it 'must calculate the md5sum of content' do
-      @test.md5sum.must_equal 'b10a8db164e0754105b7a99be72e3fe5'
+      backend.md5sum.must_equal 'b10a8db164e0754105b7a99be72e3fe5'
     end
 
     it 'must calculate the sha256sum of content' do
-      @test.sha256sum.must_equal 'a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e'
+      backend.sha256sum.must_equal 'a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e'
     end
   end
 

test/unit/plugins_v1_backend_test.rb

@@ -1,42 +1,41 @@
 require 'helper'
 
 describe 'Vulcano::Plugins::Backend' do
-  before do
-    @backend = Vulcano::Plugins::Backend
-    @child = Class.new(@backend)
-  end
+  let(:cls) { Vulcano::Plugins::Backend }
+  let(:child) { Class.new(cls) }
 
   it 'provides a name method for registering' do
-    @child.must_respond_to :name
+    child.must_respond_to :name
   end
 
   describe 'when registering a plugin' do
+    let(:registry) { Vulcano::Backend.registry }
+
     before do
-      @child.name 'test'
-      @reg = Vulcano::Backend.registry
+      child.name 'test'
     end
 
     after do
-      @reg.delete('test')
+      registry.delete('test')
     end
 
     it 'must have the backend registered' do
-      @reg.keys.must_include 'test'
-      @reg['test'].must_equal @child
+      registry.keys.must_include 'test'
+      registry['test'].must_equal child
     end
 
     it 'must raise an error if file is not implemented' do
-      t = @reg['test'].new
+      t = registry['test'].new
       proc { t.run_command }.must_raise NotImplementedError
     end
 
     it 'must raise an error if run_command is not implemented' do
-      t = @reg['test'].new
+      t = registry['test'].new
       proc { t.file }.must_raise NotImplementedError
     end
 
     it 'must raise an error if os is not implemented' do
-      t = @reg['test'].new
+      t = registry['test'].new
       proc { t.os }.must_raise NotImplementedError
     end
   end