Add currency tests.

app/Repositories/Currency/CurrencyRepository.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace FireflyIII\Repositories\Currency;
+
+
+use FireflyIII\Models\Preference;
+use FireflyIII\Models\TransactionCurrency;
+use Illuminate\Support\Collection;
+
+/**
+ * Class CurrencyRepository
+ *
+ * @package FireflyIII\Repositories\Currency
+ */
+class CurrencyRepository implements CurrencyRepositoryInterface
+{
+
+    /**
+     * @param TransactionCurrency $currency
+     *
+     * @return int
+     */
+    public function countJournals(TransactionCurrency $currency)
+    {
+        return $currency->transactionJournals()->count();
+    }
+
+    /**
+     * @return Collection
+     */
+    public function get()
+    {
+        return TransactionCurrency::get();
+    }
+
+    /**
+     * @param Preference $preference
+     *
+     * @return TransactionCurrency
+     */
+    public function getCurrencyByPreference(Preference $preference)
+    {
+        $preferred = TransactionCurrency::whereCode($preference->data)->first();
+        if (is_null($preferred)) {
+            $preferred = TransactionCurrency::first();
+        }
+
+        return $preferred;
+    }
+
+    /**
+     * @param array $data
+     *
+     * @return TransactionCurrency
+     */
+    public function store(array $data)
+    {
+        $currency = TransactionCurrency::create(
+            [
+                'name'   => $data['name'],
+                'code'   => $data['code'],
+                'symbol' => $data['symbol'],
+            ]
+        );
+
+        return $currency;
+    }
+
+    /**
+     * @param TransactionCurrency $currency
+     * @param array               $data
+     *
+     * @return TransactionCurrency
+     */
+    public function update(TransactionCurrency $currency, array $data)
+    {
+        $currency->code   = $data['code'];
+        $currency->symbol = $data['symbol'];
+        $currency->name   = $data['name'];
+        $currency->save();
+
+        return $currency;
+    }
+}