Cover setComputeUnitLimit already set

Author: Woody4618

src/lib/transaction.ts

@@ -43,13 +43,20 @@ export const getSimulationComputeUnits = async (
   lookupTables: Array<AddressLookupTableAccount> | [],
   commitment: Commitment = "confirmed",
 ): Promise<number | null> => {
-  const testInstructions = [
-    // Set an arbitrarily high number in simulation
-    // so we can be sure the transaction will succeed
-    // and get the real compute units used
-    ComputeBudgetProgram.setComputeUnitLimit({ units: 1_400_000 }),
-    ...instructions,
-  ];
+  const hasComputeInstructions = instructions.some(
+    (ix: TransactionInstruction) =>
+      ix.programId.equals(ComputeBudgetProgram.programId),
+  );
+
+  const testInstructions = hasComputeInstructions
+    ? instructions
+    : [
+        // Set an arbitrarily high number in simulation
+        // so we can be sure the transaction will succeed
+        // and get the real compute units used
+        ComputeBudgetProgram.setComputeUnitLimit({ units: 1_400_000 }),
+        ...instructions,
+      ];
 
   const testTransaction = new VersionedTransaction(
     new TransactionMessage({