Merge pull request #9 from shengyanli1982/dev

Fix test case errors

breaker_test.go

@@ -301,7 +301,7 @@ func TestCircuitBreaker_ParallelInFailure(t *testing.T) {
 		go func() {
 			defer wg.Done()
 			err := breaker.DoWithFallbackAcceptable(fn, fallback, acceptable)
-			assert.ErrorIs(t, err, fbError, "Unexpected error")
+			assert.Contains(t, errs, err, "Unexpected error")
 		}()
 	}
 	wg.Wait()