tests: Add regression tests for gdbus_codegen args

https://github.com/mesonbuild/meson/pull/9812

test cases/frameworks/7 gnome/gdbus/data/com.example.Sample.xml

@@ -6,5 +6,9 @@
       <arg direction="in" type="s" name="name"/>
       <arg direction="out" type="s" name="greeting"/>
     </method>
+    <method name="Bye">
+      <arg direction="in" type="s" name="name"/>
+      <arg direction="out" type="s" name="greeting"/>
+    </method>
   </interface>
 </node>

test cases/frameworks/7 gnome/gdbus/meson.build

@@ -10,12 +10,29 @@ assert(gdbus_src.length() == 2, 'expected 2 targets')
 assert(gdbus_src[0].full_path().endswith('.c'), 'expected 1 c source file')
 assert(gdbus_src[1].full_path().endswith('.h'), 'expected 1 c header file')
 
+sample_xml = configure_file(input: 'data/com.example.Sample.xml',
+  output: 'com.example.Sample.xml',
+  copy: true)
+
+gdbus_src = gnome.gdbus_codegen('generated-gdbus-no-docbook-files-posarg',
+  sample_xml,
+  interface_prefix : 'com.example.',
+  namespace : 'Sample',
+  annotations : [
+    ['com.example.Hello()', 'org.freedesktop.DBus.Deprecated', 'true']
+  ],
+)
+assert(gdbus_src.length() == 2, 'expected 2 targets')
+assert(gdbus_src[0].full_path().endswith('.c'), 'expected 1 c source file')
+assert(gdbus_src[1].full_path().endswith('.h'), 'expected 1 c header file')
+
 gdbus_src = gnome.gdbus_codegen('generated-gdbus',
   sources : files('data/com.example.Sample.xml'),
   interface_prefix : 'com.example.',
   namespace : 'Sample',
   annotations : [
-    ['com.example.Hello()', 'org.freedesktop.DBus.Deprecated', 'true']
+    ['com.example.Hello()', 'org.freedesktop.DBus.Deprecated', 'true'],
+    ['com.example.Bye()', 'org.freedesktop.DBus.Deprecated', 'true'],
   ],
   docbook : 'generated-gdbus-doc',
   install_header : true,