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diff --git a/tests/lzss/tlzssencoder.nim b/tests/lzss/tlzssencoder.nim
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+++ b/tests/lzss/tlzssencoder.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, sequtils
+import lzss/matchring, lzss/matchtable, lzss/lzssnode, lzss/lzssencoder
+
+suite "lzssencoder":
+  test "commonPrefixLength":
+    check commonPrefixLength([], [], 10) == 0
+    check commonPrefixLength([1'u8, 2], [1'u8, 2, 3], 10) == 2
+    check commonPrefixLength([1'u8, 2], [1'u8, 2, 3], 10) == 2
+    check commonPrefixLength([1'u8, 2, 3], [1'u8, 2, 4], 10) == 2
+    check commonPrefixLength([1'u8, 2, 3, 4], [1'u8, 2, 3, 4], 3) == 3
+
+  test "longestPrefix":
+    let buffer = [
+      0'u8, 1, 2, 9,
+      0, 1, 2, 3,
+      0, 1, 2,
+      0, 1, 2, 3, 4]
+    var candidatePos = [0, 4, 8]
+    var matchRing = initMatchRing()
+    for pos in candidatePos: matchRing.addMatch(pos)
+    let result = longestPrefix(matchRing, buffer.toOpenArray(0, 10), buffer.toOpenArray(11, buffer.len - 1))
+    check result.pos == 4
+    check result.length == 4
+
+  test "addGroups":
+    var matchTable = initMatchTable()
+    let buffer = toSeq(0'u8..10'u8)
+    matchTable.addGroups(buffer, 0, 1)
+    matchTable.addGroups(buffer, 2, 9)
+    check toSeq(matchTable.candidates([1'u8, 2, 3]).items).len == 0
+    check toSeq(matchTable.candidates([7'u8, 8, 9]).items).len == 0
+    check toSeq(matchTable.candidates([2'u8, 3, 4]).items) == [2]
+    check toSeq(matchTable.candidates([4'u8, 5, 6]).items) == [4]
+    check toSeq(matchTable.candidates([6'u8, 7, 8]).items) == [6]
+
+  test "lzssEncode":
+    let buffer = [0'u8, 1, 2, 3, 4, 5, 0, 1, 2, 3, 0, 1, 4, 5, 0, 5, 5, 0, 5, 5]
+    check lzssEncode(buffer) == [
+      lzssCharacter(0), lzssCharacter(1), lzssCharacter(2),
+      lzssCharacter(3), lzssCharacter(4), lzssCharacter(5),
+      lzssReference(4, 6), lzssCharacter(0), lzssCharacter(1),
+      lzssReference(3, 8), lzssCharacter(5),
+      lzssReference(3, 3), lzssCharacter(5)]