Added test for validator E3

tests/unit/ValidatorE3Test.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace malkusch\bav;
+
+use PHPUnit\Framework\TestCase;
+
+class ValidatorE3Test extends TestCase
+{
+    private $validator;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $backend = $this->createMock("malkusch\bav\FileDataBackend");
+        $bank = $this->createMock(
+            "malkusch\bav\Bank", array(), array($backend, 1, 'E3'));
+
+        $this->validator = new ValidatorE3($bank);
+    }
+
+    /**
+     * @param string $account The account id.
+     * @param bool $expected The expected validation result.
+     *
+     * @dataProvider provideTestData
+     */
+    public function testIsValid($account, $expected)
+    {
+        $this->assertEquals($expected, $this->validator->isValid($account));
+    }
+
+    /**
+     * Returns test cases for testIsValid().
+     *
+     * @return array Test cases.
+     */
+    public function provideTestData()
+    {
+        return [
+            // variant 1
+            ['9290701', true],
+            ['539290858', true],
+            ['1501824', true],
+            ['1501832', true],
+
+            // variant 2
+            ['9290708', true],
+            ['539290854', true],
+            ['1501823', true],
+            ['1501831', true],
+            ['2345678909', true],
+            ['5678901237', true],
+
+            // wrong
+            ['0123456789', false],
+            ['2345678901', false],
+            ['5678901234', false],
+            ['7414398260', false],
+        ];
+    }
+}