Add missing symbol and name helper on datatoken (#1667)

* add two helpers method

* fix tests

* update comments

src/contracts/Datatoken.ts

@@ -788,6 +788,26 @@ export class Datatoken extends SmartContract {
     return decimals
   }
 
+  /** It returns the token symbol
+   * @param {String} dtAddress Datatoken adress
+   * @return {Promise<number>}
+   */
+  public async getSymbol(dtAddress: string): Promise<string> {
+    const dtContract = this.getContract(dtAddress)
+    const symbol = await dtContract.methods.symbol().call()
+    return symbol
+  }
+
+  /** It returns the name of the token
+   * @param {String} dtAddress Datatoken adress
+   * @return {Promise<number>}
+   */
+  public async getName(dtAddress: string): Promise<string> {
+    const dtContract = this.getContract(dtAddress)
+    const name = await dtContract.methods.name().call()
+    return name
+  }
+
   /** It returns the token decimals, how many supported decimal points
    * @param {String} dtAddress Datatoken adress
    * @return {Promise<number>}

test/unit/Datatoken.test.ts

@@ -575,6 +575,16 @@ describe('Datatoken', () => {
     assert(decimals === '18')
   })
 
+  it('#getSymbol - should return the symbbol of the datatoken', async () => {
+    const symbol = await datatoken.getSymbol(datatokenAddress)
+    assert(symbol === 'ERC20DT1Symbol')
+  })
+
+  it('#getName - should return the name of the datatoken', async () => {
+    const name = await datatoken.getName(datatokenAddress)
+    assert(name === 'ERC20B1')
+  })
+
   it('#transfer - we can transfer the datatoken', async () => {
     const balance1before = await datatoken.balance(datatokenAddress, user1)
     const balance2before = await datatoken.balance(datatokenAddress, user2)