Add a helper to get the NFTokenID after minting (#2205)

packages/xrpl/test/utils/getNFTokenID.test.ts

@@ -0,0 +1,28 @@
+import { assert } from 'chai'
+
+import { getNFTokenID } from '../../src'
+import * as NFTokenResponse from '../fixtures/rippled/mintNFTMeta.json'
+import * as NFTokenResponse2 from '../fixtures/rippled/mintNFTMeta2.json'
+
+describe('parseNFTokenID', function () {
+  it('decode a valid NFTokenID', function () {
+    const result = getNFTokenID(NFTokenResponse.meta)
+    const expectedNFTokenID =
+      '00081388DC1AB4937C899037B2FDFC3CB20F6F64E73120BB5F8AA66A00000228'
+    assert.equal(result, expectedNFTokenID)
+  })
+
+  it('decode a different valid NFTokenID', function () {
+    const result = getNFTokenID(NFTokenResponse2.meta)
+    const expectedNFTokenID =
+      '0008125CBE4B401B2F62ED35CC67362165AA813CCA06316FFA766254000003EE'
+    assert.equal(result, expectedNFTokenID)
+  })
+
+  it('fails with nice error when given raw response instead of meta', function () {
+    assert.throws(() => {
+      // @ts-expect-error - Validating error for javascript users
+      const _ = getNFTokenID(NFTokenResponse)
+    }, /^Unable to parse the parameter given to getNFTokenID.*/u)
+  })
+})