Fix issue 414, add tests + add php8 to travis (but not composer)

.gitignore

@@ -5,6 +5,7 @@
 /build
 .idea
 .php_cs.cache
+.phpunit.result.cache
 nbproject
 composer.lock
 docs/html

.travis.yml

@@ -11,6 +11,12 @@ matrix:
   - php: 7.4
     env:
     - DEPENDENCIES="--prefer-lowest --prefer-stable"
+  - php: 8.0
+    env:
+    - DEPENDENCIES="--ignore-platform-req=php"
+  - php: 8.0
+    env:
+    - DEPENDENCIES="--ignore-platform-req=php --prefer-lowest --prefer-stable"
 
 cache:
   directories:

src/Internal/DateTimeStringBugWorkaround.php

@@ -23,7 +23,7 @@ public static function fixDateTimeString(string $dateTimeString): string
     {
         $micros = \substr($dateTimeString, 20, -1);
 
-        if (false === $micros) {
+        if (false === $micros || '' === $micros) {
             // no microseconds given
             $dateTimeString = \substr($dateTimeString, 0, 19) . '.';
             $micros = '';

tests/Internal/DateTimeStringBugWorkaroundTest.php

@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * This file is part of prooph/event-store.
+ * (c) 2014-2020 Alexander Miertsch <[email protected]>
+ * (c) 2015-2020 Sascha-Oliver Prolic <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ProophTest\EventStore\Internal;
+
+use PHPUnit\Framework\TestCase;
+use Prooph\EventStore\Internal\DateTimeStringBugWorkaround;
+
+class DateTimeStringBugWorkaroundTest extends TestCase
+{
+    public function provider(): array
+    {
+        return [
+            [
+                '2020-12-14T12:55:57Z',
+                '2020-12-14T12:55:57.000000Z',
+            ],
+            [
+                '2020-12-14T12:55:57.1234567Z',
+                '2020-12-14T12:55:57.123456Z',
+            ],
+            [
+                '2020-12-14T12:55:57.1234Z',
+                '2020-12-14T12:55:57.123400Z',
+            ],
+        ];
+    }
+
+    /**
+     * @param string $date
+     * @param string $expectedConvertedDate
+     * @dataProvider provider
+     */
+    public function test_it_correctly_converts_datetime(string $date, string $expectedConvertedDate): void
+    {
+        $actualConvertedDate = DateTimeStringBugWorkaround::fixDateTimeString($date);
+        $this->assertEquals($expectedConvertedDate, $actualConvertedDate);
+    }
+}