Test the applicablePredicates utility function (#455)

frontend/src/utilities/relation-utilities-test.ts

@@ -0,0 +1,36 @@
+import { constant } from 'lodash';
+
+import { startStore, endStore } from '../test-util';
+import mockOntology from '../mock-data/mock-ontology';
+
+import ldChannel from '../common-rdf/radio';
+import { readit, skos } from '../common-rdf/ns';
+import Node from '../common-rdf/node';
+import Graph from '../common-rdf/graph';
+
+import { applicablePredicates } from './relation-utilities';
+
+describe('relation utilities', function() {
+    beforeEach(startStore);
+
+    beforeEach(function() {
+        const ontology = new Graph(mockOntology);
+        ldChannel.reply('ontology:graph', constant(ontology));
+    });
+
+    afterEach(function() {
+        ldChannel.stopReplying('ontology:graph');
+    });
+
+    afterEach(endStore);
+
+    describe('applicablePredicates', function() {
+        it('returns the predicates applicable to a given class', function() {
+            const Reader = ldChannel.request('obtain', readit('Reader'));
+            const predicates = applicablePredicates(Reader);
+            expect(predicates.length).toBe(2);
+            expect(predicates.at(0).get(skos.prefLabel)).toBe('description of');
+            expect(predicates.at(1).get(skos.prefLabel)).toBe('inverse of description of');
+        });
+    });
+});