remkop#2102 PropertiesDefaultProvider at first try to load properties…

… from classpath

- addded test for read default values from resource classpath

src/test/java/picocli/PropertiesDefaultProviderTest.java

@@ -52,6 +52,27 @@ static class Subcommand {
         @Parameters(index = "0", paramLabel = "qqq", descriptionKey = "xxx") int xxx;
     }
 
+    @Test
+    public void testLoadFromResourceClasspathIfPropertySpecified() throws IOException {
+        Properties expected = new Properties();
+        expected.setProperty("aaa", "111");
+        expected.setProperty("bbb", "222");
+        expected.setProperty("ppp", "333");
+        expected.setProperty("xxx", "444");
+
+        MyApp myApp = new MyApp();
+        assertEquals(myApp.aaa, 0);
+        assertEquals(myApp.bbb, 0);
+        assertEquals(myApp.ppp, 0);
+        assertEquals(myApp.xxx, 0);
+        new CommandLine(myApp).parseArgs();
+
+        assertEquals(myApp.aaa, 111);
+        assertEquals(myApp.bbb, 222);
+        assertEquals(myApp.ppp, 333);
+        assertEquals(myApp.xxx, 444);
+    }
+
     @Test
     public void testLoadFromUserHomeCommandNameByDefault() throws IOException {
         File f = new File(System.getProperty("user.home"), ".providertest.properties");

src/test/resources/.providertest.properties

@@ -0,0 +1,6 @@
+#exported from test
+#Mon Sep 18 12:37:21 CEST 2023
+aaa=111
+ppp=333
+bbb=222
+xxx=444