Rename instance variable in a test

Author: mrkn

test/iruby/jupyter_test.rb

@@ -3,24 +3,24 @@
 module IRubyTest
   class JupyterDefaultKernelSpecDirectoryTest < TestBase
     def setup
-      @kernel_spec = IRuby::Jupyter.kernelspec_dir
+      @kernelspec_dir = IRuby::Jupyter.kernelspec_dir
     end
 
     def test_default_windows
       windows_only
       appdata = IRuby::Jupyter.send :windows_user_appdata
-      assert_equal(File.join(appdata, 'jupyter/kernels'), @kernel_spec)
+      assert_equal(File.join(appdata, 'jupyter/kernels'), @kernelspec_dir)
     end
 
     def test_default_apple
       apple_only
-      assert_equal(File.expand_path('~/Library/Jupyter/kernels'), @kernel_spec)
+      assert_equal(File.expand_path('~/Library/Jupyter/kernels'), @kernelspec_dir)
     end
 
     def test_default_unix
       unix_only
       with_env('XDG_DATA_HOME' => nil) do
-        assert_equal(File.expand_path('~/.local/share/jupyter/kernels'), @kernel_spec)
+        assert_equal(File.expand_path('~/.local/share/jupyter/kernels'), @kernelspec_dir)
       end
     end
   end