Ethereum Smart Contract Development

Reading tweets

By post-mining the smart contracts, the functions can be used from smart contract accounts to read the tweets posted by users on the private blockchain. Here, we are showing a different variant by using the remix browser in Figure 9.18. We deploy three tweets on the blockchain as a test:

Tweet0: "Hello Blockchain."

Tweet1: "Hello Ethereum."

Tweet2: "This is a junk tweet which contains spurious characters in order to exceed the 160 character limit which is being used as a negative test case and check the correctness of the smart contract operation."

We can see in Figure 9.18 the number of tweets returns only two because the third tweet gets rejected:

Figure 9.18: Tweeter smart contract testing using remix browser