1 files changed, 34 insertions, 0 deletions
diff --git a/tests/stdlib/tsysrand.nim b/tests/stdlib/tsysrand.nim
new file mode 100644
index 000000000..7b7a0fc34
--- /dev/null
+++ b/tests/stdlib/tsysrand.nim
@@ -0,0 +1,34 @@
+discard """
+  targets: "c cpp js"
+  matrix: "--experimental:vmopsDanger; --experimental:vmopsDanger --mm:refc"
+"""
+
+import std/sysrand
+import std/assertions
+
+template main() =
+  block:
+    var x = array[5, byte].default
+    doAssert urandom(x)
+
+  block:
+    var x = newSeq[byte](5)
+    doAssert urandom(x)
+
+  block:
+    var x = @[byte(0), 0, 0, 0, 0]
+    doAssert urandom(x)
+
+  block:
+    var x = @[byte(1), 2, 3, 4, 5]
+    doAssert urandom(x)
+
+  block:
+    doAssert urandom(0).len == 0
+    doAssert urandom(10).len == 10
+    doAssert urandom(20).len == 20
+    doAssert urandom(120).len == 120
+    doAssert urandom(113).len == 113
+    doAssert urandom(1234) != urandom(1234) # unlikely to fail in practice
+
+main()