Include property in mock ontology (#455)

Author: jgonggrijp

frontend/src/category-colors/category-toggle-mixin-test.ts

@@ -46,7 +46,7 @@ function selector(classNames: string[]): string {
 
 describe('CategoryToggleMixin', function() {
     beforeAll(function() {
-        this.ontology = new Graph(mockOntology);
+        this.ontology = new Graph(mockOntology.slice(0, 4));
         this.classes = compact(this.ontology.map(getCssClassName));
         expect(this.classes.length).toBeGreaterThan(1);
         this.styling = new CategoryStyling({ collection: this.ontology });

frontend/src/mock-data/mock-ontology.ts

@@ -152,4 +152,5 @@ export default [
     mediumClass,
     readerClass,
     personClass,
+    descriptionOfProperty,
 ]