dom: Add simple tests for serialize

We don't check for error condition (e.g. in previous
commit) yet as it's not obvious how to trigger it
without first raising an error elsewhere when we
build our dom.

dom/test/test_dom_serialize.sh

@@ -0,0 +1,7 @@
+#!/bin/sh -e
+
+for t in ${0%.sh}_*.f90
+do
+  TEST=${t%.f90}
+  ./test.sh $TEST
+done

dom/test/test_dom_serialize_1.f90

@@ -0,0 +1,25 @@
+program test_serialize_1
+
+   use FoX_dom
+
+   implicit none
+
+   type(Node), pointer :: myDoc, root, np, dummy
+
+   ! Create a new document and get a pointer to the root element, this gives you the minimum empty dom
+   myDoc => createDocument(getImplementation(), "http://www.example.com", "root-element", null())
+   root => getDocumentElement(myDoc)
+
+   ! You can now do DOMish things like create new elements and append them to the document root element 
+   ! dummy ends up pointing at the child-element
+   np => createElementNS(myDoc, "http://www.example.com", "child-element")
+   dummy => appendChild(root, np)
+
+   ! Call serialize to produce the document
+   call serialize(myDoc, "test.xml")
+
+   ! And don't forget to clean up the memory
+   call destroy(myDoc)
+
+end program test_serialize_1
+

dom/test/test_dom_serialize_1.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0"?>
+<root-element xmlns="http://www.example.com"><child-element/></root-element>

dom/test/test_dom_serialize_2.f90

@@ -0,0 +1,26 @@
+program test_serialize_2
+
+   use FoX_dom
+
+   implicit none
+
+   type(Node), pointer :: myDoc, root, np, dummy
+   type(DOMException) :: ex
+
+   ! Create a new document and get a pointer to the root element, this gives you the minimum empty dom
+   myDoc => createDocument(getImplementation(), "http://www.example.com", "root-element", null())
+   root => getDocumentElement(myDoc)
+
+   ! You can now do DOMish things like create new elements and append them to the document root element 
+   ! dummy ends up pointing at the child-element
+   np => createElementNS(myDoc, "http://www.example.com", "child-element")
+   dummy => appendChild(root, np)
+
+   ! Call serialize to produce the document
+   call serialize(myDoc, "test.xml", ex)
+
+   ! And don't forget to clean up the memory
+   call destroy(myDoc)
+
+end program test_serialize_2
+

dom/test/test_dom_serialize_2.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0"?>
+<root-element xmlns="http://www.example.com"><child-element/></root-element>