more unit tests

src/rendering.js

@@ -17,7 +17,7 @@ let resources = {
 try {
   resources = require('../resources.json');
 } catch (err) {
-  console.error('fa-diagrams: SVG resources could not be loaded', err);
+  console.error('fa-diagrams: SVG resources could not be loaded: ' + err);
 }
 
 /**

test/rendering.test.js

@@ -1,9 +1,27 @@
 /* jshint -W117 */
-const rendering = require('../src/rendering');
+let rendering = require('../src/rendering');
+const fs = require('fs');
 
 const solidCirclePath = 'M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z';
 const regularCirclePath = 'M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200z';
 
+describe('resources fail', () => {
+  beforeAll(() => {
+    fs.renameSync('resources.json', 'resources.tmp.json');
+    jest.resetModules();
+    rendering = require('../src/rendering');
+  });
+  afterAll(() => {
+    fs.renameSync('resources.tmp.json', 'resources.json');
+    jest.resetModules();
+    rendering = require('../src/rendering');
+  });
+  test('getIcon no resources', () => {
+    const res = rendering().getIcon('regular circle');
+    expect(res).toBeNull();
+  });
+});
+
 describe('getIcon', () => {
   test('no name', () => {
     const res = rendering().getIcon(undefined);