Unrar contains security vulnerabilities and has thus been removed from Guix.
From a16f97b02bd8afd0ec05c471e156f631f2cc6eec Mon Sep 17 00:00:00 2001
From: Brendan Tildesley <mail@brendan.scot>
Date: Tue, 26 Mar 2019 22:17:03 +1100
Subject: [PATCH] Remove test_unrar.

---
 src/calibre/test_build.py | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index d67afd20a6..709132ef17 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -220,10 +220,6 @@ class BuildTest(unittest.TestCase):
         from calibre.gui2.win_file_dialogs import test
         test()
 
-    def test_unrar(self):
-        from calibre.utils.unrar import test_basic
-        test_basic()
-
     @unittest.skipUnless(iswindows, 'WPD is windows only')
     def test_wpd(self):
         wpd = plugins['wpd'][0]
-- 
2.21.0

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