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-rw-r--r--tests/user-envs.sh10
1 files changed, 10 insertions, 0 deletions
diff --git a/tests/user-envs.sh b/tests/user-envs.sh
index c9eed5a6633d..5e4fcb7bc7f5 100644
--- a/tests/user-envs.sh
+++ b/tests/user-envs.sh
@@ -99,6 +99,16 @@ if nix-env -q '*' | grep -q bar; then false; fi
 nix-env --list-generations
 test "$(nix-env --list-generations | wc -l)" -eq 7
 
+# Doing the same operation twice results in the same generation, which triggers
+# "lazy" behaviour and does not create a new symlink.
+
+nix-env -i foo
+nix-env -i foo
+
+# Count generations.
+nix-env --list-generations
+test "$(nix-env --list-generations | wc -l)" -eq 8
+
 # Switch to a specified generation.
 nix-env --switch-generation 7
 [ "$(nix-store -q --resolve $profiles/test)" = "$oldGen" ]