feat: add dnsAllocCost method to MNS contract and corresponding tests (…

…#728)

src/contracts-wrappers/mns.ts

@@ -1,4 +1,4 @@
-import { Args, bytesToStr, strToBytes, U256 } from '../basicElements'
+import { Args, bytesToStr, strToBytes, U256, U64 } from '../basicElements'
 import { Operation } from '../operation'
 import { Provider, PublicProvider } from '../provider'
 import { CallSCOptions, ReadSCOptions, SmartContract } from '../smartContracts'
@@ -151,4 +151,16 @@ export class MNS extends SmartContract {
     )
     return domainsBytes.map((d) => bytesToStr(d))
   }
+
+  async dnsAllocCost(domain: string, options?: ReadSCOptions): Promise<bigint> {
+    const res = await this.read(
+      'dnsAllocCost',
+      new Args().addString(domain),
+      options
+    )
+
+    if (res.info.error) throw new Error(res.info.error)
+
+    return U64.fromBytes(res.value)
+  }
 }

test/integration/mns.spec.ts

@@ -85,4 +85,15 @@ describe('MNS tests using PublicProvider', () => {
 
     await expect(mns.free(domain)).rejects.toThrow()
   }, 300000)
+
+  test('get dns allocation cost', async () => {
+    const domain = 'trloloooooooooooooooololololzs'
+    const res = await mns.dnsAllocCost(domain)
+    expect(res).toBeGreaterThan(0n)
+  })
+
+  test('get dns allocation cost fail if invalid domain', async () => {
+    const domain = 'trloloooooooooooooooololoPolzs////'
+    await expect(mns.dnsAllocCost(domain)).rejects.toThrow(/.*Invalid domain.*/)
+  })
 })