Fix #379 Add a default guiTestFile parameter

This will allow a user to supply a path to a test file on the command line that will then be preloaded in the JMeter GUI when it starts.

CHANGELOG.md

@@ -6,6 +6,8 @@
 
 ### Bug Fixes ###
 
+* Issue [379](https://github.com/jmeter-maven-plugin/jmeter-maven-plugin/issues/379) Add the ability to supply a filename on the command line when starting up JMeter in GUI mode
+
 ## Version 3.1.0 Release Notes (19 May 2020)
 
 ### Enhancements ###

README.md

@@ -34,6 +34,12 @@ Once you have added the plugin to your project you will be able to invoke the JM
 mvn jmeter:configure jmeter:gui
 ```
 
+If you want to preload a test, you can specify it on the command line:
+
+```
+mvn jmeter:configure jmeter:gui -DguiTestFile=src/test/jmeter/test.jmx
+```
+
 If you haven't added the plugin to your project you can still invoke it (provided you have a valid pom.xml in your project) by using the following:
 
 ```

src/main/java/com/lazerycode/jmeter/mojo/AbstractJMeterMojo.java

@@ -132,7 +132,6 @@ public abstract class AbstractJMeterMojo extends AbstractMojo {
     @Parameter(defaultValue = "${settings}", readonly = true)
     protected Settings settings;
 
-
     /**
      * Value class that wraps all proxy configurations.
      */

src/main/java/com/lazerycode/jmeter/mojo/RunJMeterGUIMojo.java

@@ -30,7 +30,7 @@ public class RunJMeterGUIMojo extends AbstractJMeterMojo {
     /**
      * Supply a test file to open in the GUI once it is loaded.
      */
-    @Parameter
+    @Parameter(defaultValue = "${guiTestFile}")
     private File guiTestFile;
 
     /**