Add dust amount test for initiate-withdrawal-request

Author: BowTiedRadone

contracts/contracts/sbtc-withdrawal.tests.clar

@@ -1,8 +1,10 @@
 ;; Properties
 
 (define-constant ERR_ASSERTION_FAILED (err u1001))
+(define-constant ERR_UNWRAP_FAILURE (err u1002))
 
 (define-constant deployer tx-sender)
+(define-constant dust_limit_error_code u502)
 
 ;; This is a test utility, not an assertion. It randomly mints sbtc-tokens to
 ;; users, supporting other tests.
@@ -95,4 +97,42 @@
       (ok true)
     )
   )
+)
+
+(define-public (test-initiate-withdrawal-dust-amount
+    (amount uint)
+    (recipient { version: (buff 1), hashbytes: (buff 32) })
+    (max-fee uint)
+  )
+  (if
+    (or
+      (is-eq amount u0)
+      (> amount DUST_LIMIT)
+      (<
+        (unwrap-panic
+          (contract-call? .sbtc-token get-balance-available tx-sender)
+        )
+        (+ amount max-fee)
+      )
+    )
+    (ok false)
+    (let
+      (
+        (withdrawal-request-result
+          (initiate-withdrawal-request amount recipient max-fee)
+        )
+      )
+      (asserts!
+        (and
+          (is-err withdrawal-request-result)
+          (is-eq
+            (unwrap-err! withdrawal-request-result ERR_UNWRAP_FAILURE)
+            dust_limit_error_code
+          )
+        )
+        ERR_ASSERTION_FAILED
+      )
+      (ok true)
+    )
+  )
 )