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-rw-r--r--users/sterni/nix/utf8/tests/default.nix10
1 files changed, 10 insertions, 0 deletions
diff --git a/users/sterni/nix/utf8/tests/default.nix b/users/sterni/nix/utf8/tests/default.nix
index 2f8054fad6d9..fdc0b067156f 100644
--- a/users/sterni/nix/utf8/tests/default.nix
+++ b/users/sterni/nix/utf8/tests/default.nix
@@ -113,9 +113,19 @@ let
         randomUnicode
       ]));
 
+  testDecodingEncoding = it "checks that decoding and then encoding forms an identity"
+    (builtins.map
+      (s: assertEq "Decoding and then encoding “${s}” yields itself"
+        (utf8.encode (utf8.decode s)) s)
+      (lib.flatten [
+        glassSentences
+        randomUnicode
+      ]));
+
 in
   runTestsuite "nix.utf8" [
     testFailures
     testAscii
     testDecoding
+    testDecodingEncoding
   ]