add small test and remove redundant default parameter value

Author: mihkeleidast

src/__tests__/config.js

@@ -42,9 +42,11 @@ describe('configuration API', () => {
 
   describe('RTL options', () => {
     test('configure can set by a plain JS object', () => {
-      configure({reactStrictMode: true})
+      const advanceTimers = jest.fn()
+      configure({reactStrictMode: true, advanceTimers})
 
       expect(getConfig().reactStrictMode).toBe(true)
+      expect(getConfig().advanceTimers).toBe(advanceTimers)
     })
 
     test('configure can set by a function', () => {

src/config.js

@@ -17,7 +17,7 @@ function jestFakeTimersAreEnabled() {
   return false
 }
 
-function maybeAdvanceJestTimers(delay = 0) {
+function maybeAdvanceJestTimers(delay) {
   if (jestFakeTimersAreEnabled()) {
     jest.advanceTimersByTime(delay)
   }