Add barplot test

test/uplot/command_test.rb

@@ -4,20 +4,38 @@ require "tempfile"
 require_relative '../test_helper'
 
 class YouPlotCommandTest < Test::Unit::TestCase
+  def startup
+  end
+
   def setup
-    @ta = "ta"
-    @stdin = $stdin.dup
+    @stdin  = $stdin.dup
+    $stdin  = File.open(File.expand_path("../fixtures/iris.csv", __dir__), "r")
     @stderr = $stderr.dup
   end
 
-  test :scatter do
-    $stdin  = File.open(File.expand_path("../fixtures/iris.csv", __dir__), "r")
-    Tempfile.new("iris-scatter") do |tmp_file|
-      $stderr = tmp_file
-      YouPlot::Command.new(["scatter", "-H", "-d,", "-t", "IRIS"]).run
-      assert_equal File.read(File.expand_path("../fixtures/iris-scatter.txt", __dir__)), tmp_file.read
-    end
-    $stdin = @stdin
+  def cleanup
+    $stdin  = @stdin
     $stderr = @stderr
   end
+
+  def fixture(fname)
+    File.read(File.expand_path("../fixtures/#{fname}", __dir__))
+  end
+
+  test :scatter do
+    Tempfile.new do |tmp_file|
+      $stderr = tmp_file
+      YouPlot::Command.new(["scatter", "-H", "-d,", "-t", "IRIS"]).run
+      assert_equal fixture('iris-scatter.txt'), tmp_file.read
+    end
+  end
+
+  test :barplot do
+    Tempfile.new do |tmp_file|
+      $stderr = tmp_file
+      YouPlot::Command.new(["barplot", "-H", "-d,", "-t", "IRIS"]).run
+      assert_equal fixture('iris-bar.txt'), tmp_file.read
+    end
+  end
+
 end