2 files changed, 35 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.exp
new file mode 100644
index 000000000000..724c1f9c34b9
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.exp
@@ -0,0 +1 @@
+[ true true false true true false true true false true true false true true false true true false true true false true true false true true true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix
new file mode 100644
index 000000000000..3d688cb8bd68
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix
@@ -0,0 +1,34 @@
+let
+  # apply is thunked, so we can create a thunked value using the identity function
+  thunk = x: x;
+in
+[
+  (builtins.isAttrs { bar = throw "baz"; })
+  (builtins.isAttrs (thunk { foo = 13; }))
+  (builtins.isAttrs (thunk 123))
+  (builtins.isBool true)
+  (builtins.isBool (thunk false))
+  (builtins.isBool (thunk "lol"))
+  (builtins.isFloat 1.2)
+  (builtins.isFloat (thunk (1 * 1.0)))
+  (builtins.isFloat 1)
+  (builtins.isFunction thunk)
+  (builtins.isFunction (thunk thunk))
+  (builtins.isFunction {})
+  (builtins.isInt 1)
+  (builtins.isInt (thunk 42))
+  (builtins.isInt 1.0)
+  (builtins.isList [ (throw "oh no") (abort "it's over") ])
+  (builtins.isList (thunk [ 21 21 ]))
+  (builtins.isList (thunk {}))
+  (builtins.isNull null)
+  (builtins.isNull (thunk null))
+  (builtins.isNull 42)
+  (builtins.isPath ./relative)
+  (builtins.isPath (thunk /absolute))
+  (builtins.isPath "/not/a/path")
+  (builtins.isString "simple")
+  (builtins.isString "${{ outPath = "coerced"; }}")
+  (builtins.isString "hello ${"interpolation"}")
+  (builtins.isString true)
+]