[TASK] Restructure tests/ folder.

Move unit tests to tests/unit/. Get the old still working UnitTests
into a working state again.
Updated composer.json with required-dev packages.
Create a new folder tests/acceptance for Behat functional/acceptance
testing. Add a first Feature draft of a Behat functional test for
local login.

tests/unit/TextTest.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * this file contains tests for text.php
+ *
+ * @package test.util
+ */
+
+use PHPUnit\Framework\TestCase;
+
+/** required, it is the file under test */
+require_once('include/text.php');
+
+/**
+ * TestCase for the texter
+ *
+ * @author ken restivo
+ * @package test.util
+ */
+class TextTest extends TestCase {
+	public function testGoodEmail() {
+		$this->assertTrue(valid_email_regex('ken@spaz.org'));
+	}
+	public function testGoodEmail2() {
+		$this->assertTrue(valid_email_regex('ken@restivo.org'));
+	}
+	public function testGoodEmail3() {
+		$this->assertTrue(valid_email_regex('nobody@hubzilla.com'));
+	}
+	public function testBadEmail() {
+		$this->assertFalse(valid_email_regex('nobody!uses!these!any.more'));
+	}
+
+}