Add test for illegal its:dir value

Author: rubensworks

lib/RdfXmlParser.ts

@@ -676,7 +676,7 @@ while ${attribute.value} and ${activeSubjectValue} where found.`);
         throw this.newParseError(`Expected exactly one triple term in rdf:parseType="Triple" but got ${poppedTag.childrenTripleTerms.length}`);
       }
       for (const tripleTerm of poppedTag.childrenTripleTerms) {
-        this.emitTriple(poppedTag.subject, poppedTag.predicate, tripleTerm, null, parentTag?.childrenTripleTerms);
+        this.emitTriple(poppedTag.subject, poppedTag.predicate, tripleTerm, null, parentTag.childrenTripleTerms);
       }
       poppedTag.predicateEmitted = true;
     }
@@ -715,7 +715,7 @@ while ${attribute.value} and ${activeSubjectValue} where found.`);
   private setDirection(activeTag: IActiveTag, value?: string) {
     if (value) {
       if (value !== 'ltr' && value !== 'rtl') {
-        throw this.newParseError(`Base directions must either be 'ltr' or 'rtl', while ${value} was found.`);
+        throw this.newParseError(`Base directions must either be 'ltr' or 'rtl', while '${value}' was found.`);
       }
       activeTag.direction = value;
     } else {

test/RdfXmlParser-test.ts

@@ -846,6 +846,19 @@ abc`)).rejects.toBeTruthy();
           new Error('5:13: unbound namespace prefix: "ex".'));
       });
 
+      it('on illegal its:dir values', async () => {
+        return expect(parse(parser, `<?xml version="1.0"?>
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+            xmlns:dc="http://purl.org/dc/elements/1.1/"
+            xmlns:ex="http://example.org/stuff/1.0/"
+            xmlns:its="http://www.w3.org/2005/11/its">
+  <rdf:Description rdf:about="http://www.w3.org/TR/rdf-syntax-grammar" xml:lang="en-us" its:dir="abc">
+    <dc:title>RDF 1.1 XML Syntax</dc:title>
+  </rdf:Description>
+</rdf:RDF>`)).rejects.toEqual(
+            new Error('Base directions must either be \'ltr\' or \'rtl\', while \'abc\' was found.'));
+      });
+
       it('on rdf:parseType="Triple" with missing predicate in triple term', async () => {
         return expect(parse(parser, `<?xml version="1.0"?>
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"