Started by adding some system tests for the api.

seasoned_api/test/helpers/createCacheEntry.js

@@ -0,0 +1,10 @@
+const Cache = require('src/tmdb/cache');
+const SqliteDatabase = require('src/database/sqliteDatabase');
+
+function createCacheEntry(key, value) {
+  const database = new SqliteDatabase(':memory:');
+  const cache = new Cache(database);
+  return cache.set(key, value);
+}
+
+module.exports = createCacheEntry;