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package goutils
import (
"fmt"
"math/rand"
"regexp"
"strconv"
"testing"
)
// ****************************** TESTS ********************************************
func TestRandomSeed(t *testing.T) {
// count, start, end, letters, numbers := 5, 0, 0, true, true
random := rand.New(rand.NewSource(10))
out := "3ip9v"
// Test 1: Simulating RandomAlphaNumeric(count int)
if x, _ := RandomSeed(5, 0, 0, true, true, nil, random); x != out {
t.Errorf("RandomSeed(%v, %v, %v, %v, %v, %v, %v) = %v, want %v", 5, 0, 0, true, true, nil, random, x, out)
}
// Test 2: Simulating RandomAlphabetic(count int)
out = "MBrbj"
if x, _ := RandomSeed(5, 0, 0, true, false, nil, random); x != out {
t.Errorf("RandomSeed(%v, %v, %v, %v, %v, %v, %v) = %v, want %v", 5, 0, 0, true, false, nil, random, x, out)
}
// Test 3: Simulating RandomNumeric(count int)
out = "88935"
if x, _ := RandomSeed(5, 0, 0, false, true, nil, random); x != out {
t.Errorf("RandomSeed(%v, %v, %v, %v, %v, %v, %v) = %v, want %v", 5, 0, 0, false, true, nil, random, x, out)
}
// Test 4: Simulating RandomAscii(count int)
out = "H_I;E"
if x, _ := RandomSeed(5, 32, 127, false, false, nil, random); x != out {
t.Errorf("RandomSeed(%v, %v, %v, %v, %v, %v, %v) = %v, want %v", 5, 32, 127, false, false, nil, random, x, out)
}
// Test 5: Simulating RandomSeed(...) with custom chars
chars := []rune{'1', '2', '3', 'a', 'b', 'c'}
out = "2b2ca"
if x, _ := RandomSeed(5, 0, 0, false, false, chars, random); x != out {
t.Errorf("RandomSeed(%v, %v, %v, %v, %v, %v, %v) = %v, want %v", 5, 0, 0, false, false, chars, random, x, out)
}
}
// ****************************** EXAMPLES ********************************************
func ExampleRandomSeed() {
var seed int64 = 10 // If you change this seed #, the random sequence below will change
random := rand.New(rand.NewSource(seed))
chars := []rune{'1', '2', '3', 'a', 'b', 'c'}
rand1, _ := RandomSeed(5, 0, 0, true, true, nil, random) // RandomAlphaNumeric (Alphabets and numbers possible)
rand2, _ := RandomSeed(5, 0, 0, true, false, nil, random) // RandomAlphabetic (Only alphabets)
rand3, _ := RandomSeed(5, 0, 0, false, true, nil, random) // RandomNumeric (Only numbers)
rand4, _ := RandomSeed(5, 32, 127, false, false, nil, random) // RandomAscii (Alphabets, numbers, and other ASCII chars)
rand5, _ := RandomSeed(5, 0, 0, true, true, chars, random) // RandomSeed with custom characters
fmt.Println(rand1)
fmt.Println(rand2)
fmt.Println(rand3)
fmt.Println(rand4)
fmt.Println(rand5)
// Output:
// 3ip9v
// MBrbj
// 88935
// H_I;E
// 2b2ca
}
func TestRandAlphaNumeric_FuzzOnlyNumeric(t *testing.T) {
// Testing for a reported regression in which some versions produced
// a predictably small set of chars.
iters := 1000
charlen := 0
for i := 0; i < 16; i++ {
numOnly := 0
charlen++
for i := 0; i < iters; i++ {
out, err := RandomAlphaNumeric(charlen)
if err != nil {
t.Fatal("func failed to produce a random thinger")
}
if _, err := strconv.Atoi(out); err == nil {
numOnly++
}
m, err := regexp.MatchString("^[0-9a-zA-Z]+$", out)
if err != nil {
t.Fatal(err)
}
if !m {
t.Fatal("Character is not alphanum")
}
}
if numOnly == iters {
t.Fatalf("Got %d numeric-only random sequences", numOnly)
}
}
}
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