Add: Allow to set and reset the text on an XML command object

Not every XML element will have a value/text. Therefore it should be
possible to set it optionally.

Author: bjoernricks

gvm/xml.py

@@ -123,6 +123,15 @@ def set_attributes(self, attrs: dict[str, str]) -> "XmlCommandElement":
 
         return self
 
+    def set_text(self, text: Optional[str]) -> "XmlCommandElement":
+        """Set the text of the element.
+
+        Args:
+            text: Text to be set on the element. None to remove the text.
+        """
+        self._element.text = text
+        return self
+
     def append_xml_str(self, xml_text: str) -> None:
         """Append a xml element in string format."""
         node = parse_xml(xml_text)

tests/xml/test_xml_command.py

@@ -39,6 +39,18 @@ def test_should_allow_to_set_attributes(self):
 
         self.assertEqual(cmd.to_string(), '<foo bar="1" baz="2"/>')
 
+    def test_should_allow_to_set_text(self):
+        cmd = XmlCommand("foo")
+        cmd.set_text("bar")
+        self.assertEqual(cmd.to_string(), "<foo>bar</foo>")
+
+    def test_should_allow_to_reset_text(self):
+        cmd = XmlCommand("foo")
+        sub_cmd = cmd.add_element("bar", "baz")
+        sub_cmd.set_text("qux")
+
+        self.assertEqual(cmd.to_string(), "<foo><bar>qux</bar></foo>")
+
     def test_should_convert_to_string(self):
         cmd = XmlCommand("foo")