test: added new test suite for PrngSystemContract (#416)

.github/workflows/tests.yml

@@ -95,6 +95,12 @@ jobs:
     with:
       testfilter: ShanghaiOpcodes
 
+  PrngSystemContract:
+    name: PrngSystemContract Test Suite
+    uses: ./.github/workflows/test-workflow.yml
+    with:
+      testfilter: PrngSystemContract
+
   PublishResults:
     name: Publish Results
     if: ${{ !cancelled() }}

test/constants.js

@@ -55,6 +55,7 @@ const Events = {
   GetNonFungibleTokenInfo: 'GetNonFungibleTokenInfo',
   TinyBars: 'TinyBars',
   TinyCents: 'TinyCents',
+  PseudoRandomSeed: 'PseudoRandomSeed',
 }
 
 const Path = {
@@ -97,6 +98,7 @@ const Contract = {
   ERC20SnapshotMock: 'ERC20SnapshotMock',
   HRCContract: 'HRCContract',
   ExchangeRateMock: 'ExchangeRateMock',
+  PrngSystemContract: 'PrngSystemContract',
 }
 
 const CALL_EXCEPTION = 'CALL_EXCEPTION'

test/util-precompile/PrngSystemContract.js

@@ -0,0 +1,47 @@
+/*-
+ *
+ * Hedera Smart Contracts
+ *
+ * Copyright (C) 2023 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+const { expect } = require('chai')
+const { ethers } = require('hardhat')
+const Constants = require('../constants')
+
+describe('PrngSystemContract tests', function () {
+  let prngSystemContract
+
+  before(async function () {
+    const factory = await ethers.getContractFactory(
+      Constants.Contract.PrngSystemContract
+    )
+
+    prngSystemContract = await factory.deploy()
+  })
+
+  it('should be able to execute getPseudorandomSeed to generate a pseudo random seed', async function () {
+    const tx = await prngSystemContract.getPseudorandomSeed()
+    const txReceipt = await tx.wait()
+
+    const result = txReceipt.events.filter(
+      (e) => e.event === Constants.Events.PseudoRandomSeed
+    )[0].args[0]
+
+    expect(result).to.exist
+    expect(result).to.not.hexEqual(ethers.constants.HashZero)
+  })
+})