https://github.com/PHPOffice/PHPWord/issues/46

Tests.

Tests/PHPWord/TemplateTest.php

@@ -0,0 +1,85 @@
+<?php
+namespace PHPWord\Tests;
+
+use PHPWord_Template;
+
+/**
+ * @coversDefaultClass PHPWord_Template
+ */
+class PHPWord_TemplateTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @covers ::applyXslStyleSheet
+     * @test
+     */
+    final public function testXslStyleSheetCanBeApplied()
+    {
+        // TODO: implement after merge of the issue https://github.com/PHPOffice/PHPWord/issues/56
+    }
+
+    /**
+     * @covers                   ::applyXslStyleSheet
+     * @expectedException        Exception
+     * @expectedExceptionMessage Could not set values for the given XSL style sheet parameters.
+     * @test
+     */
+    final public function testXsLStyleSheetCanNotBeAppliedOnFailureOfSettingParameterValue()
+    {
+        $template = new PHPWord_Template(
+            \join(\DIRECTORY_SEPARATOR,
+            array(\PHPWORD_TESTS_DIR_ROOT, '_files', 'templates', 'blank.docx'))
+        );
+
+        $xslDOMDocument = new \DOMDocument();
+        $xslDOMDocument->load(
+            \join(\DIRECTORY_SEPARATOR,
+            array(\PHPWORD_TESTS_DIR_ROOT, '_files', 'xsl', 'passthrough.xsl'))
+        );
+
+        $template->applyXslStyleSheet($xslDOMDocument, [1 => 'somevalue']);
+    }
+
+    /**
+     * @covers                   ::applyXslStyleSheet
+     * @expectedException        Exception
+     * @expectedExceptionMessage Could not load XML from the given template.
+     * @test
+     */
+    final public function testXslStyleSheetCanNotBeAppliedOnFailureOfLoadingXmlFromTemplate()
+    {
+        $template = new PHPWord_Template(
+            \join(\DIRECTORY_SEPARATOR,
+            array(\PHPWORD_TESTS_DIR_ROOT, '_files', 'templates', 'corrupted_main_document_part.docx'))
+        );
+
+        $xslDOMDocument = new \DOMDocument();
+        $xslDOMDocument->load(
+            \join(\DIRECTORY_SEPARATOR,
+            array(\PHPWORD_TESTS_DIR_ROOT, '_files', 'xsl', 'passthrough.xsl'))
+        );
+
+        $template->applyXslStyleSheet($xslDOMDocument);
+    }
+
+    /**
+     * @covers                   ::applyXslStyleSheet
+     * @expectedException        Exception
+     * @expectedExceptionMessage Could not transform the given XML document.
+     * @test
+     */
+    final public function testXslStyleSheetCanNotBeAppliedOnFailureOfTransformation()
+    {
+        $template = new PHPWord_Template(
+            \join(\DIRECTORY_SEPARATOR,
+            array(\PHPWORD_TESTS_DIR_ROOT, '_files', 'templates', 'blank.docx'))
+        );
+
+        $xslDOMDocument = new \DOMDocument();
+        $xslDOMDocument->load(
+            \join(\DIRECTORY_SEPARATOR,
+            array(\PHPWORD_TESTS_DIR_ROOT, '_files', 'xsl', 'blank.xsl'))
+        );
+
+        $template->applyXslStyleSheet($xslDOMDocument);
+    }
+}

Tests/_files/xsl/blank.xsl

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+
+</xsl:stylesheet>

Tests/_files/xsl/passthrough.xsl

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
+
+    <xsl:template match='@*|node()'>
+        <xsl:copy>
+            <xsl:apply-templates select='@*|node()'/>
+        </xsl:copy>
+    </xsl:template>
+
+</xsl:stylesheet>