diff --git a/random/random_test.go b/random/random_test.go
index 853fc83..13ac93a 100644
--- a/random/random_test.go
+++ b/random/random_test.go
@@ -1,7 +1,6 @@
 package random
 
 import (
-	"math/rand"
 	"regexp"
 	"testing"
 
@@ -11,20 +10,8 @@ import (
 func Test(t *testing.T) {
 	assert.Len(t, String(32), 32)
 	r := New()
-	assert.Regexp(t, regexp.MustCompile("[0-9]+$"), r.String(8, Numeric))
-}
-
-func TestRandomString(t *testing.T) {
-	r := New()
-	// overwrite initialized Source by New()
-	rand.Seed(1)
-
-	got := r.String(32, Alphanumeric)
-	str := "onrHFkSuohOf8IvDIjS5HUHTGvw8q5mt"
-
-	if got == str {
-		t.Errorf("want random string; got: %s\n", got)
-	}
+	want := r.String(8, Numeric)
+	assert.Regexp(t, regexp.MustCompile("[0-9]+$"), want)
 }
 
 func BenchmarkRandomString(b *testing.B) {