Make sure transformers match API definition.

tests/Unit/Transformers/CurrencyTransformerTest.php

@@ -0,0 +1,93 @@
+<?php
+/**
+ * CurrencyTransformerTest.php
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Transformers;
+
+use FireflyIII\Models\TransactionCurrency;
+use FireflyIII\Transformers\CurrencyTransformer;
+use Log;
+use Symfony\Component\HttpFoundation\ParameterBag;
+use Tests\TestCase;
+
+
+/**
+ * Class CurrencyTransformerTest
+ */
+class CurrencyTransformerTest extends TestCase
+{
+    /**
+     *
+     */
+    public function setUp(): void
+    {
+        parent::setUp();
+        Log::info(sprintf('Now in %s.', \get_class($this)));
+    }
+
+    /**
+     * Basic coverage
+     *
+     * @covers \FireflyIII\Transformers\CurrencyTransformer
+     */
+    public function testBasic(): void
+    {
+        // mocks and prep:
+        $parameters  = new ParameterBag;
+        $currency    = TransactionCurrency::first();
+        $transformer = app(CurrencyTransformer::class);
+        $transformer->setParameters($parameters);
+
+        // action
+        $result = $transformer->transform($currency);
+
+
+        $this->assertEquals($currency->code, $result['code']);
+        $this->assertFalse($result['default']);
+
+    }
+
+    /**
+     * Basic coverage with default currency
+     *
+     * @covers \FireflyIII\Transformers\CurrencyTransformer
+     */
+    public function testDefaultCurrency(): void
+    {
+        // mocks and prep:
+        $parameters = new ParameterBag;
+        $currency   = TransactionCurrency::first();
+        $parameters->set('defaultCurrency', $currency);
+        $transformer = app(CurrencyTransformer::class);
+        $transformer->setParameters($parameters);
+
+
+        // action
+        $result = $transformer->transform($currency);
+
+
+        $this->assertEquals($currency->code, $result['code']);
+        $this->assertTrue($result['default']);
+
+    }
+
+}