Testing the Blockchain constructor function

Let's test the Blockchain constructor function as follows: 

1. Lets make an instance of our Blockchain constructor function, so we will add the following line of code:

const bitcoin = new Blockchain();

1. The bitcoin variable in the preceding line of code is just used for the purpose of an example. Then we add the following line of code:

console.log(bitcoin); 

With the preceding line of code, bitcoin should be our blockchain. There is currently no data or blocks in this, but it should log out as a blockchain. Let's save the test.js file and run the test to observe the output on the terminal window.

1. Now go to our terminal window. In here, we're currently in the blockchain directory, and our test.js file is in our dev folder, so type the following command in the terminal: 

node dev/test.js

This preceding line of code will allow us to run the test that we have written to test our Blockchain constructor function.

1. Now press Enter, and we'll get to observe the Blockchain on the terminal window, as highlighted in the following screenshot: 

From the output in the preceding screenshot, we can observe that Blockchain has an empty chain and an empty transactions array. This is exactly what we expected the output to be.