Validate std/random dice args (#16430)

Fixes #16429

crates/nu-std/std/random/mod.nu

@@ -1,3 +1,5 @@
+use std/assert greater
+
 # for examples
 alias "random dice" = dice
 
@@ -11,6 +13,9 @@ export def dice [
     --dice = 1  # The amount of dice being rolled
     --sides = 6  # The amount of sides a die has
 ]: nothing -> list<int> {
+    greater $dice 0 "The amount of dice must be greater than 0"
+    greater $sides 1 "The amount of sides must be greater than 1"
+
     mut out = []
     for _ in 1..$dice {
     	$out ++= [(random int 1..$sides)]

crates/nu-std/tests/test_std_random.nu

@@ -0,0 +1,38 @@
+use std/assert
+use std/testing *
+use std/random
+
+@test
+def "random dice rejects negative sides" [] {
+  assert error {
+    random dice --sides (-2)
+  } "--sides (-2) should not have been accepted"
+}
+
+@test
+def "random dice rejects zero sides" [] {
+  assert error {
+    random dice --sides 0
+  } "--sides 0 should not have been accepted"
+}
+
+@test
+def "random dice rejects negative dice" [] {
+  assert error {
+    random dice --dice (-2)
+  } "--dice (-2) should not have been accepted"
+}
+
+@test
+def "random dice rejects zero dice" [] {
+  assert error {
+    random dice --dice 0
+  } "--dice 0 should not have been accepted"
+}
+
+@test
+def "random dice rejects one-sided dice" [] {
+  assert error {
+    random dice --sides 1
+  } "--sides 1 should not have been accepted"
+}