Basic API client

src/client.js

+'use strict';
+
+var assert = require('assert');
+
+function ClearbitClient (config) {
+  config = config || {};
+  assert(this instanceof ClearbitClient, 'Client must be called with new');
+  assert(!!config.key, 'An API key must be provided');
+  this.key = config.key;
+};
+
+module.exports = ClearbitClient;
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test/client.js

+'use strict';
+
+var expect         = require('chai').expect;
+var ClearbitClient = require('../src/client');
+
+describe('ClearbitClient', function () {
+
+  it('must be called with new', function () {
+    expect(ClearbitClient).to.throw(/called with new/);
+  });
+
+  it('must provide an API key', function () {
+    expect(function () {
+      return new ClearbitClient();
+    })
+    .to.throw(/API key/);
+  });
+
+  it('configures the API key', function () {
+    expect(new ClearbitClient({key: 'k'})).to.have.property('key', 'k');
+  });
+
+});
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