tests: Improve the test for XML.namespace()

tests/tests/swfs/avm2/xml_namespace/Test.as

@@ -3,9 +3,27 @@ package {
   public class Test extends Sprite { }
 }
 
-var xml = <foo>bar</foo>;
-trace("xml.namespace(): " + xml.namespace());
+testXML(<root />);
+testXML(<root xmlns="http://example.org" />);
+testXML(<root xmlns:other="http://other.com" />);
+testXML(<root xmlns:other="http://other.com" xmlns="http://example.org" />);
 
-var ns = xml.namespace();
-trace("ns.prefix: " + ns.prefix);
-trace("ns.uri: " + ns.uri);
+function testXML(xml: XML) {
+  trace(xml.toXMLString());
+  trace("// namespace()");
+  dumpNS(xml.namespace());
+  trace('// namespace("")');
+  dumpNS(xml.namespace(""));
+  trace('// namespace("other")');
+  dumpNS(xml.namespace("other"));
+  trace("");
+}
+
+function dumpNS(ns: Namespace) {
+  if (ns) {
+    trace("ns.prefix: " + ns.prefix);
+    trace("ns.uri: " + ns.uri);
+  } else {
+    trace("ns is null");
+  }
+}

tests/tests/swfs/avm2/xml_namespace/output.txt

@@ -1,3 +1,40 @@
-xml.namespace(): 
+<root/>
+// namespace()
 ns.prefix: 
 ns.uri: 
+// namespace("")
+ns is null
+// namespace("other")
+ns is null
+
+<root xmlns="http://example.org"/>
+// namespace()
+ns.prefix: 
+ns.uri: http://example.org
+// namespace("")
+ns.prefix: 
+ns.uri: http://example.org
+// namespace("other")
+ns is null
+
+<root xmlns:other="http://other.com"/>
+// namespace()
+ns.prefix: 
+ns.uri: 
+// namespace("")
+ns is null
+// namespace("other")
+ns.prefix: other
+ns.uri: http://other.com
+
+<root xmlns:other="http://other.com" xmlns="http://example.org"/>
+// namespace()
+ns.prefix: 
+ns.uri: http://example.org
+// namespace("")
+ns.prefix: 
+ns.uri: http://example.org
+// namespace("other")
+ns.prefix: other
+ns.uri: http://other.com
+