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diff --git a/tests/huffman/thuffmantreebuilder.nim b/tests/huffman/thuffmantreebuilder.nim
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+++ b/tests/huffman/thuffmantreebuilder.nim
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+# gzip-like LZSS compressor
+# Copyright (C) 2018  Pacien TRAN-GIRARD
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import unittest, streams, sequtils, tables
+import huffman/huffmantree, huffman/huffmantreebuilder
+
+suite "huffmantreebuilder":
+  let
+    stats = newCountTable(concat(repeat(1'u, 3), repeat(2'u, 1), repeat(3'u, 2)))
+    tree = huffmanBranch(
+      huffmanLeaf(1'u),
+      huffmanBranch(
+        huffmanLeaf(2'u),
+        huffmanLeaf(3'u)))
+  
+  test "buildHuffmanTree":
+    check buildHuffmanTree(stats) == tree