test fallback works in sandboxes

test/specs/options.test.js

@@ -29,19 +29,26 @@ module.exports = (fetchMock, theGlobal, fetch) => {
 			});
 
 			it('error when configured on sandbox without fetch defined', () => {
-				fm.config.fallbackToNetwork = true;
 				const sbx = fm.sandbox();
-				expect(() => sbx.fetchHandler('http://it.at.there/')).to.throw();
+				sbx.config.fallbackToNetwork = true;
+				expect(() => sbx('http://it.at.there/')).to.throw();
 			});
 
 			it('not error when configured on sandbox with fetch defined', async () => {
-				fm.config.fallbackToNetwork = true;
-				fm.config.fetch = () => Promise.resolve(200);
 				const sbx = fm.sandbox();
-				expect(() => sbx.fetchHandler('http://it.at.there/')).not.to.throw();
+				sbx.config.fallbackToNetwork = true;
+				sbx.config.fetch = () => Promise.resolve(200);
+				expect(() => sbx('http://it.at.there/')).not.to.throw();
 			});
 
-
+			it('actually falls back to network when configured in a sandbox properly', async () => {
+				const sbx = fm.sandbox();
+				sbx.config.fetch = fetch;
+				sbx.config.fallbackToNetwork = true;
+				sbx.mock('http://it.at.where', 204);
+				const res = await sbx('http://localhost:9876/dummy-file.txt')
+				expect(res.status).to.equal(200);
+			});
 
 		});