func TestEqual(t *testing.T) {
err1 := errors.New(5, nil, "abc")
err2 := errors.New(5, nil, "abc")
err3 := errors.New(6, err1, "abc")
err4 := errors.New(6, err1, "abc")
assert.False(t, err1 == err2)
assert.False(t, err3 == err4)
}
func TestSessionID(t *testing.T) {
m := make(map[string]interface{}, 0)
// 随机产生几个字符串，看是否有可能重复
for i := 0; i < 10000; i++ {
sid, err := sessionID()
assert.Nil(t, err)
//assert.Equal(t, len(sid), sessionIDLen)
_, found := m[sid]
assert.False(t, found)
m[sid] = nil
}
}