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diff --git a/tests/thuffmanencoder.nim b/tests/thuffmanencoder.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, tables
+import bitreader, bitwriter
+import huffmantree, huffmanencoder
+
+suite "huffencoder":
+  let tree = huffmanBranch(
+    huffmanLeaf(1'u),
+    huffmanBranch(
+      huffmanLeaf(2'u),
+      huffmanLeaf(3'u)))
+
+  test "buildCodebook":
+    let codebook = buildCodebook(tree, uint)
+    check codebook.len == 3
+    check codebook[1'u] == 0b0
+    check codebook[2'u] == 0b01
+    check codebook[3'u] == 0b11
+
+  test "encode":
+    let encoder = tree.encoder(uint)
+    check encoder.encode(1'u) == 0b0
+    check encoder.encode(2'u) == 0b01
+    check encoder.encode(3'u) == 0b11