github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/libraries/utils/test/random.go (about)

     1  // Copyright 2019 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package test
    16  
    17  import "math/rand"
    18  
    19  const (
    20  	// ShouldNeverHappen is only seen when the impossible happens.
    21  	ShouldNeverHappen = "http://www.nooooooooooooooo.com"
    22  )
    23  
    24  // RandomData returns a slice of a given size filled with random data
    25  func RandomData(size int) []byte {
    26  	randBytes := make([]byte, size)
    27  	filled := 0
    28  	for filled < size {
    29  		n, err := rand.Read(randBytes[filled:])
    30  
    31  		if err != nil {
    32  			panic(ShouldNeverHappen)
    33  		}
    34  
    35  		filled += n
    36  	}
    37  
    38  	return randBytes
    39  }