Expand test coverage.

tests/Unit/Import/Converter/INGDebitCreditTest.php

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+<?php
+/**
+ * INGDebitCreditTest.php
+ * Copyright (c) 2017 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\Import\Converter;
+
+use FireflyIII\Import\Converter\INGDebitCredit;
+use Tests\TestCase;
+
+/**
+ * Class INGDebitCreditTest
+ */
+class INGDebitCreditTest extends TestCase
+{
+    /**
+     * @covers \FireflyIII\Import\Converter\INGDebitCredit::convert()
+     */
+    public function testConvertAf()
+    {
+        $converter = new INGDebitCredit;
+        $result    = $converter->convert('Af');
+        $this->assertEquals(-1, $result);
+    }
+
+    /**
+     * @covers \FireflyIII\Import\Converter\INGDebitCredit::convert()
+     */
+    public function testConvertBij()
+    {
+        $converter = new INGDebitCredit;
+        $result    = $converter->convert('Bij');
+        $this->assertEquals(1, $result);
+    }
+
+    /**
+     * @covers \FireflyIII\Import\Converter\INGDebitCredit::convert()
+     */
+    public function testConvertAnything()
+    {
+        $converter = new INGDebitCredit;
+        $result    = $converter->convert('9083jkdkj');
+        $this->assertEquals(1, $result);
+    }
+}