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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix5
3 files changed, 9 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix
new file mode 100644
index 000000000000..bc7a16ded8f3
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix
@@ -0,0 +1,3 @@
+# Negative start is illegal, but negative length works, see
+# eval-okay-builtins-substring-negative-length.nix
+builtins.substring (-1) 1 "Wiggly Donkers"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp
new file mode 100644
index 000000000000..e614d4994041
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp
@@ -0,0 +1 @@
+[ "SIP dial" "Lounge" " Lounge" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix
new file mode 100644
index 000000000000..062e2c0581d7
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix
@@ -0,0 +1,5 @@
+[
+  (builtins.substring 0 (-1) "SIP dial")
+  (builtins.substring 13 (-1) "Nichtraucher Lounge")
+  (builtins.substring 12 (-2) "Nichtraucher Lounge")
+]