fix(age): make age optional (#59)

lib/vehicle.js

@@ -5,6 +5,16 @@ const _ = require('lodash');
 
 /** @exports Vehicle */
 
+/**
+ * @param {Object} response
+ *
+ * @return {Date|null} A parsed age or null if no age exists
+ */
+const parseAge = function(response) {
+  const age = _.get(response, 'headers.sc-data-age', null);
+  return age ? new Date(age) : null;
+};
+
 /**
  * Initializes a new Vehicle to use for making requests to the Smartcar API.
  *
@@ -138,7 +148,7 @@ Vehicle.prototype.location = function() {
     .then(function(response) {
       return {
         data: response.body,
-        age: new Date(response.headers['sc-data-age']),
+        age: parseAge(response),
       };
     });
 };
@@ -173,7 +183,7 @@ Vehicle.prototype.odometer = function() {
     .then(function(response) {
       return {
         data: response.body,
-        age: new Date(response.headers['sc-data-age']),
+        age: parseAge(response),
         unitSystem: response.headers['sc-unit-system'],
       };
     });

test/lib/vehicle.js

@@ -170,6 +170,23 @@ test('location', async function(t) {
 
 });
 
+test('location - no age', async function(t) {
+
+  const body = {
+    latitude: 1234,
+    longitude: 1234,
+  };
+  const headers = {};
+  t.context.n = nocks.base()
+    .get('/location')
+    .reply(200, body, headers);
+
+  const response = await vehicle.location();
+  t.deepEqual(response.data, body);
+  t.is(response.age, null);
+
+});
+
 test('odometer', async function(t) {
 
   const body = {
@@ -192,6 +209,25 @@ test('odometer', async function(t) {
 
 });
 
+test('odometer - no age', async function(t) {
+
+  const body = {
+    distance: 1234,
+  };
+  const headers = {
+    'sc-unit-system': 'metric',
+  };
+  t.context.n = nocks.base()
+    .get('/odometer')
+    .reply(200, body, headers);
+
+  const response = await vehicle.odometer();
+  t.deepEqual(response.data, body);
+  t.is(response.age, null);
+  t.is(response.unitSystem, headers['sc-unit-system']);
+
+});
+
 test('vin', async function(t) {
 
   const body = {