added second test with Path option to directly specify the file

test_package/config_test.cpp

@@ -2371,4 +2371,69 @@ DevicesStyle { Location = /styles/styles.xsl }
 
     m_config->stop();
   }
+
+  TEST_F(ConfigTest, should_update_stylesheet_versions_with_path)
+  {
+    fs::path root {createTempDirectory("14")};
+
+    fs::path styleDir { root / "styles" };
+    fs::create_directory(styleDir);
+
+    fs::path styles { styleDir / "styles.xsl" };
+    copyFile("styles/styles.xsl", styles, 0min);
+
+    fs::path devices(root / "Devices.xml");
+    copySampleFile("empty.xml", devices, 0min);
+
+    fs::path config {root / "agent.cfg"};
+    {
+      ofstream cfg(config.string());
+      cfg << R"DOC(
+SchemaVersion = 2.2
+)DOC";
+      cfg << "Devices = " << devices << endl;
+      cfg << R"DOC(
+DevicesStyle {
+  Location = /styles/styles.xsl
+  Path = ./styles/styles.xsl
+}
+)DOC";
+
+    }
+
+    boost::program_options::variables_map options;
+    boost::program_options::variable_value value(boost::optional<string>(config.string()), false);
+    options.insert(make_pair("config-file"s, value));
+
+    m_config->initialize(options);
+
+    ifstream file(styles);
+    ASSERT_TRUE(file.is_open());
+
+    stringstream sf;
+    sf << file.rdbuf();
+
+    ASSERT_EQ(R"DOC(<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet version="1.0"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:xs="http://www.w3.org/2001/XMLSchema"
+  xmlns:fn="http://www.w3.org/2005/xpath-functions"
+  xmlns:m="urn:mtconnect.org:MTConnectDevices:2.2"
+  xmlns:s="urn:mtconnect.org:MTConnectStreams:2.2"
+  xmlns:e="urn:mtconnect.org:MTConnectError:2.2"
+  xmlns:js="urn:custom-javascript"
+  exclude-result-prefixes="msxsl js"
+  xmlns:msxsl="urn:schemas-microsoft-com:xslt">
+
+  <xsl:output method="html" version="1.0" encoding="UTF-8" indent="yes" />
+
+  <!-- Root template -->
+  <xsl:template match="/">
+  </xsl:template>
+</xsl:stylesheet>
+)DOC", sf.str());
+
+    m_config->stop();
+  }
+
 }  // namespace