Add a test to xmlparser

lib/pure/xmlparser.nim

@@ -143,7 +143,8 @@ proc loadXml*(path: string): XmlNode =
   result = loadXml(path, errors)
   if errors.len > 0: raiseInvalidXml(errors)
 
-when not defined(testing) and isMainModule:
+when isMainModule:
+  when not defined(testing):
     import os
 
     var errors: seq[string] = @[]
@@ -156,4 +157,10 @@ when not defined(testing) and isMainModule:
       f.close()
     else:
       quit("cannot write test.txt")
+  else:
+    block: # correctly parse ../../tests/testdata/doc1.xml
+      let filePath = "tests/testdata/doc1.xml"
+      var errors: seq[string] = @[]
+      var xml = loadXml(filePath, errors)
+      assert(errors.len == 0, "The file tests/testdata/doc1.xml should be parsed without errors.")
 

tests/testdata/doc1.xml

@@ -5,6 +5,7 @@
     <test2>
       bla ah absy hsh
       hsh
+      &woohoo;
       sjj
     </test2>
     <test><teh>bla</teh></test>