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Support for setting a seed, to allow recreation #5

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merged 3 commits into from
Sep 4, 2020
Merged

Support for setting a seed, to allow recreation #5

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c0b0749
support for setting a seed
trabetti Feb 26, 2019
7dd9a02
testing that seed makes results recreatable
trabetti Feb 26, 2019
849f950
improve testing
trabetti Feb 26, 2019
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4 changes: 4 additions & 0 deletions reggen.go
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Original file line number Diff line number Diff line change
Expand Up @@ -201,6 +201,10 @@ func NewGenerator(regex string) (*Generator, error) {
}, nil
}

func (gen *Generator) SetSeed(seed int64) {
gen.rand = rand.New(rand.NewSource(seed))
}

func Generate(regex string, limit int) (string, error) {
g, err := NewGenerator(regex)
if err != nil {
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29 changes: 29 additions & 0 deletions reggen_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import (
"fmt"
"regexp"
"testing"
"time"
)

type testCase struct {
Expand Down Expand Up @@ -51,6 +52,34 @@ func TestGenerate(t *testing.T) {
}
}

func TestSeed(t *testing.T) {
g1, err := NewGenerator(cases[0].regex)
if err != nil {
t.Fatal("Error creating generator: ", err)
}
g2, err := NewGenerator(cases[0].regex)
if err != nil {
t.Fatal("Error creating generator: ", err)
}
currentTime := time.Now().UnixNano()
g1.SetSeed(currentTime)
g2.SetSeed(currentTime)
for i := 0; i < 10; i++ {
if g1.Generate(100) != g2.Generate(100) {
t.Error("Results are not reproducible")
}
}

g1.SetSeed(123)
g2.SetSeed(456)
for i := 0; i < 10; i++ {
if g1.Generate(100) == g2.Generate(100) {
t.Error("Results should not match")
}
}

}

func BenchmarkGenerate(b *testing.B) {
r, err := NewGenerator(`^[a-z]{5,10}@[a-z]+\.(com|net|org)$`)
if err != nil {
Expand Down