I'm creating new rule to avoid using 'contain' in 'should' assertion. I've used 'yo eslint:plugin' and then 'yo eslint:rule' to create structure. Now trying to write a rule. 
Unfortunately after `npm test` I'm getting `AssertionError [ERR_ASSERTION]: Should have 1 error but had 0: []`.

> 
> lib/rules/no-contain-assertion.js
> 
> 
> 

```
module.exports = {
  meta: {
    docs: {
      description:
        "Rule to flag use of should.('contain') in tests, preventing tests with non strict assertion being committed accidentally",
      category: "StrictAssertion",
      recommended: false
    },
    fixable: null, // or "code" or "whitespace"
    schema: [
      // fill in your schema
    ]
  },

  create: function(context) {
    return {
      StrictAssertion(node) {
        if (node.object.name === 'should' && node.arguments[0] === 'contain') {
          context.report({
            node,
            message: `Don't use ${node}(${node.arguments[0]})`,
          });
        }
      }
    };
  }
};

```

> 
> tests/lib/rules/no-contain-assertion.js
> 
> 
> 

```
var ruleTester = new RuleTester();
ruleTester.run("no-contain-assertion", rule, {

    valid: [
        "should('have.text')"
    ],

    invalid: [
        {
            code: "should('contain')",
            errors: [{
                message: "Don't use 'contain' in assertion!",
                type: "StrictAssertion"
            }]
        }
    ]
});

```