1 files changed, 15 insertions, 0 deletions
diff --git a/tests/functional/ca/racy.nix b/tests/functional/ca/racy.nix
new file mode 100644
index 000000000..555a15484
--- /dev/null
+++ b/tests/functional/ca/racy.nix
@@ -0,0 +1,15 @@
+# A derivation that would certainly fail if several builders tried to
+# build it at once.
+
+
+with import ./config.nix;
+
+mkDerivation {
+  name = "simple";
+  buildCommand = ''
+    mkdir $out
+    echo bar >> $out/foo
+    sleep 3
+    [[ "$(cat $out/foo)" == bar ]]
+  '';
+}