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eosio.token
One of the most used contracts in the EOS world at this time is the eosio.token one.
Here are the steps you would need to run the test example
have running local nodeos
eoslime init --with-example
eoslime test
 Let's test it!
const assert = require('assert');
​
const TOKEN_WASM_PATH = './example/eosio-token/contract/eosio.token.wasm';
const TOKEN_ABI_PATH = './example/eosio-token/contract/eosio.token.abi';
​
describe('EOSIO Token', function (eoslime) {
​
    // Increase mocha(testing framework) time, otherwise tests fails
    this.timeout(15000);
​
    let tokenContract;
    let tokensIssuer;
    let tokensHolder;
​
    const TOTAL_SUPPLY = '1000000000.0000 SYS';
    const HOLDER_SUPPLY = '100.0000 SYS';
​
    before(async () => {
        let accounts = await eoslime.Account.createRandoms(2);
        tokensIssuer = accounts[0];
        tokensHolder = accounts[1];
    });
​
    beforeEach(async () => {
        /*
            `deploy` creates for you a new account behind the scene
            on which the contract code is deployed
​
            You can access the contract account as -> tokenContract.executor
        */
        tokenContract = await eoslime.Contract.deploy(TOKEN_WASM_PATH, TOKEN_ABI_PATH);
    });
​
    it('Should create a new token', async () => {
        await tokenContract.actions.create(tokensIssuer.name, TOTAL_SUPPLY);
​
        /*
            You have access to the EOS(eosjs) instance:
                eoslime.Provider.eos
        */
        let tokenInitialization = await tokenContract.provider.eos.getCurrencyStats(tokenContract.name, 'SYS');
​
        assert.equal(tokenInitialization.SYS.max_supply, TOTAL_SUPPLY, 'Incorrect tokens supply');
        assert.equal(tokenInitialization.SYS.issuer, tokensIssuer.name, 'Incorrect tokens issuer');
    });
​
    it('Should issue tokens', async () => {
        await tokenContract.actions.create(tokensIssuer.name, TOTAL_SUPPLY);
        await tokenContract.actions.issue(tokensHolder.name, HOLDER_SUPPLY, 'memo', { from: tokensIssuer });
​
        let holderBalance = await tokensHolder.getBalance('SYS', tokenContract.name);
        assert.equal(holderBalance[0], HOLDER_SUPPLY, 'Incorrect holder balance');
    });
​
    it('Should throw if tokens quantity is negative', async () => {
        await tokenContract.actions.create(tokensIssuer.name, TOTAL_SUPPLY);
        const INVALID_ISSUING_AMOUNT = '-100.0000 SYS';
​
        /*
            eoslime provides you testing utils (Available only if testing with `eoslime test`)
        */
        await eoslime.tests.expectAssert(
            tokenContract.actions.issue(tokensHolder.name, INVALID_ISSUING_AMOUNT, 'memo', { from: tokensIssuer })
        );
​
        let holderBalance = await tokensHolder.getBalance('SYS', tokenContract.name);
        assert.equal(holderBalance.length, 0, 'Incorrect holder balance');
    });
});
The famous "Hello World"
For the very beginning of every introduction of something new, there is always the famous "Hello World" example. However, this time our "Hello World" example is going to be a bit more blockchain related. 
We are going to use the code of one member of our community. With many thanks to the Jack Tanner who prepared the below example for you.
Here are the steps you would need to run the example
Clone the repo
git clone https://github.com/theblockstalk/eosio-contracts.git
cd commit_hash_reveal
npm install
Install mocha if you don't have it 
 npm install mocha
Have running local nodeos
Compile the contract
eosio-cpp -I contract/include -R resource -o build/commitreveal.wasm -contract commitreveal ./contract/src/commitreveal.cpp --abigent 
Run the tests 
mocha helloworld11.test.js 
​
We will have a smart contract serving the following functionality
 commit hash to blockchain
another account can reveal the hash with original digest
Check out the full contract code here. 
Let's look how to test the contract's behaviour
const assert = require('assert');
const crypto = require("./crypto");
​
const CONTRACT_WASM_PATH = '../build/commitreveal.wasm';
const CONTRACT_ABI_PATH = '../build/commitreveal.abi';
​
describe('Commit and reveal', function (eoslime) {
    // Increase mocha(testing framework) time, otherwise tests fails
    this.timeout(15000);
​
    let contractAccount;
    let myAccount;
    let messagesTable;
    
    before(async () => {
        // Create a random account on chain
        myAccount = await eoslime.Account.createRandom();
    });
​
    beforeEach(async () => {
        // Deploy a contract
        contractAccount = await eoslime.Contract.deploy(CONTRACT_WASM_PATH, CONTRACT_ABI_PATH);
        messagesTable = contractAccount.tables.messages;
    });
​
    it('Should store the hash', async () => {
        // Find last ten messages
        let messages = await messagesTable.limit(10).find();
        assert.equal(messages.length, 0, "Should not have any rows yet");
        
        const messageString = "hello world";
        const messageHash = crypto.sha256(messageString);
        
        // Broadcast a 'commit' transaction to the chain
        await contractAccount.actions.commit(myAccount.name, messageHash, { from: myAccount });
​
        // Get all messages related to my
        messages = await messagesTable.equal(myAccount.name).find();
​
        const message = messages[0];
        assert.equal(message.user, myAccount.name, "account name not correct");
        assert.equal(message.hash, messageHash, "hash was not stored in the table");
    });
​
    it('Should verify the hash', async () => {
        const messageString = "hello world";
        const messageHash = crypto.sha256(messageString);
​
        await contractAccount.actions.commit(myAccount.name, messageHash, { from: myAccount });
​
        messages = await messagesTable.equal(myAccount.name).find();
        assert.equal(messages.length, 1, "hash was not added to the table");
​
        await contractAccount.actions.reveal(myAccount.name, messageString);
​
        messages = await messagesTable.equal(myAccount.name).find();
        assert.equal(messages.length, 0, "hash was not removed from the table");
    });
});
​
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eosio.token
The famous "Hello World"
eosio.token

The famous "Hello World"

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