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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.nix18
2 files changed, 19 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.exp
new file mode 100644
index 000000000000..168276022898
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.exp
@@ -0,0 +1 @@
+[ "tes" "testing" "" "estin" "ting" "" "" "" "" "est" "est" "est" "est" "est" "est" "" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.nix
new file mode 100644
index 000000000000..f4ee82e2736f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring.nix
@@ -0,0 +1,18 @@
+[
+  (builtins.substring 0 3 "testing")
+  (builtins.substring 0 300 "testing")
+  (builtins.substring 3 0 "testing")
+  (builtins.substring 1 5 "testing")
+  (builtins.substring 3 5 "testing")
+  (builtins.substring 300 300 "testing")
+  (builtins.substring 301 300 "testing")
+  (builtins.substring 0 0 "")
+  (builtins.substring 0 1 "")
+  (builtins.substring (builtins.add 0 1) 3 "testing")
+  (builtins.substring 1 (builtins.add 3 0) "testing")
+  (builtins.substring (builtins.add 0 1) (builtins.add 3 0) "testing")
+  (builtins.substring (builtins.add 0 1) (builtins.add 3 0) "testing")
+  (builtins.substring (builtins.add 0 1) (builtins.add 3 0) ("test" + "ing"))
+  (builtins.substring (builtins.add 0 1) (builtins.add 3 0) ("test" + "ing"))
+  (builtins.substring 300 (-10) "testing")
+]