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+# Copyright (C) 2016 all contributors <msgthr-public@80x24.org>
+# License: GPL-2.0+ <https://www.gnu.org/licenses/gpl-2.0.txt>
+require 'test/unit'
+require 'msgthr'
+
+class TestMsgthr < Test::Unit::TestCase
+  def test_msgthr
+    thr = Msgthr.new
+    thr.add('a', %w(c b), 'abc')
+    thr.add('b', %w(c), 'B')
+    thr.add('c', nil, 'c')
+    thr.add('D', nil, 'D')
+    thr.add('d', nil, 'd')
+    thr.thread!
+    rootset = thr.order! { |c| c.sort! { |a, b| a.mid <=> b.mid } }
+    assert_equal %w(D c d), rootset.map(&:mid)
+    assert_equal 'D', rootset[0].msg
+    assert_equal %w(b), rootset[1].children.map(&:mid)
+  end
+end