Add test for GenerateMockDataService

The service is just picking random from arrays of fixed values. We feel there is very little we need to cover so the tests just ensure that the service is 'working'.

test/services/data/mock/generate-mock-data.service.test.js

@@ -0,0 +1,31 @@
+'use strict'
+
+// Test framework dependencies
+const Lab = require('@hapi/lab')
+const Code = require('@hapi/code')
+
+const { describe, it } = exports.lab = Lab.script()
+const { expect } = Code
+
+// Thing under test
+const GenerateMockDataService = require('../../../../app/services/data/mock/generate-mock-data.service.js')
+
+describe('Generate Bill Run service', () => {
+  describe('when called', () => {
+    it('generates a fake name', () => {
+      const result = GenerateMockDataService.go()
+
+      expect(result.name).to.exist()
+      expect(result.name).to.be.a.string()
+    })
+
+    it('generates a fake address', () => {
+      const result = GenerateMockDataService.go()
+
+      expect(result.address).to.exist()
+      expect(result.address).to.be.an.array()
+      expect(result.address).to.have.length(3)
+      expect(result.address[0]).to.be.a.string()
+    })
+  })
+})