Add unit test for Description addText method (#1151)

* Add unit test for Description data type

test/classes/phing/types/DescriptionTest.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information please see
+ * <http://phing.info>.
+ */
+
+class DescriptionTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * Test that the aaddText method appends text to description w/o any spaces
+     *
+     * @return void
+     */
+    public function testAddTextAppendsDirectly()
+    {
+        $description = new Description();
+        $project = new Project();
+        $text = "project description";
+        $project->setDescription("project description");
+        $this->assertEquals($text, $project->getDescription());
+
+        $description->setProject($project);
+        $description->addText("appended");
+        $this->assertEquals("{$text}appended", $project->getDescription());
+    }
+}