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diff --git a/test/test_rg_state.rb b/test/test_rg_state.rb
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+# -*- encoding: binary -*-
+# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net>
+# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+require './test/helper'
+require 'dtas/rg_state'
+
+class TestRGState < Minitest::Unit::TestCase
+
+  def test_rg_state
+    rg = DTAS::RGState.new
+    assert_equal({}, rg.to_hsh)
+    rg.preamp = 0.1
+    assert_equal({"preamp" => 0.1}, rg.to_hsh)
+    rg.preamp = 0
+    assert_equal({}, rg.to_hsh)
+  end
+
+  def test_load
+    rg = DTAS::RGState.load("preamp" => 0.666)
+    assert_equal({"preamp" => 0.666}, rg.to_hsh)
+  end
+
+  def test_mode_set
+    rg = DTAS::RGState.new
+    orig = rg.mode
+    assert_equal DTAS::RGState::RG_DEFAULT["mode"], orig
+    %w(album_gain track_gain album_peak track_peak).each do |t|
+      rg.mode = t
+      assert_equal t, rg.mode
+    end
+  end
+end