Resolve "Import prototype adapter code from example-web-client"

Closes #1 (closed)

features/adapter_broadcast.feature

+Feature: Can the adapter broadcast messages?
+  The adapter publish method works as expected
+
+  Scenario: A message can be published successfully
+    Given valid config
+    When the adapter instance is created
+    When the auth method is called
+    When a mock notify API response is configured to return success
+    When the broadcast method is called
+    Then a successful response is returned with status 200
+
+  Scenario: A failed publish returns a 403
+    Given valid config
+    When the adapter instance is created
+    When the auth method is called
+    When a mock notify API response is configured to return an error
+    When the broadcast method is called
+    Then an error response is returned with status 403
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test/cucumber/adapter/before.steps.js

   this.tracker = tracker;
   this.recorder = recorder;
   let services = {
-    recorder: this.recorder,
-    tracker: this.tracker
+    recorder,
+    tracker
   };
   this.protocol = new TrackedGenericProtocol(this.schema, services);
   this.protocol.resetTracker();

test/cucumber/adapter/broadcast.steps.js

+const assert = require('assert');
+const { When, Then } = require('@cucumber/cucumber');
+
+const { fixtures } = require('../../fixtures/server');
+
+const mockValidConfig = fixtures.get('config-valid');
+
+When('a mock notify API response is configured to return success', function() {
+  const response = {};
+  this.mockAxios.onPost(
+    `${mockValidConfig.api}/notify`, 
+  ).reply(200, response);
+});
+
+When('a mock notify API response is configured to return an error', function() {
+  this.mockAxios.onPost(
+    `${mockValidConfig.api}/notify`,
+  ).reply(403, { message: 'Token expired' })
+});
+
+When('the broadcast method is called', function() {
+  const message = fixtures.get('message-vehicle-status');
+  this.message = message;
+  const body = JSON.stringify(message);
+  this.call = this.adapter.broadcast(body);
+});
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