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diff --git a/tests/tgziplike.nim b/tests/tgziplike.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, os, ospaths, osproc
+import gziplike
+
+const tempDir = "tmp"
+
+suite "main":
+  setup: createDir(tempDir)
+  teardown: removeDir(tempDir)
+
+  test "identity (text)":
+    let input = "license.md"
+    let intermediate = tempDir / "compressed"
+    let final = tempDir / "decompressed"
+    compress.transform(input, intermediate)
+    decompress.transform(intermediate, final)
+    check startProcess("cmp", args=[input, final], options={poUsePath}).waitForExit() == 0
+
+  test "identity (binary)":
+    let input = "tests" / "tgziplike"
+    let intermediate = tempDir / "compressed"
+    let final = tempDir / "decompressed"
+    compress.transform(input, intermediate)
+    decompress.transform(intermediate, final)
+    check startProcess("cmp", args=[input, final], options={poUsePath}).waitForExit() == 0