Improve testing

Author: dwin

go.mod

@@ -1,6 +1,9 @@
 module github.com/dwin/goSecretBoxPassword
 
 require (
+	github.com/corpix/uarand v0.0.0 // indirect
+	github.com/icrowley/fake v0.0.0-20180203215853-4178557ae428
+	github.com/stretchr/testify v1.3.0 // indirect
 	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
 	golang.org/x/sys v0.0.0-20181213200352-4d1cda033e06 // indirect
 )

go.sum

@@ -1,3 +1,14 @@
+github.com/corpix/uarand v0.0.0 h1:mNbzro1GwUcZ1hmO2rWXytkR3JBxNxxctzjyuhO+Aig=
+github.com/corpix/uarand v0.0.0/go.mod h1:JSm890tOkDN+M1jqN8pUGDKnzJrsVbJwSMHBY4zwz7M=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/icrowley/fake v0.0.0-20180203215853-4178557ae428 h1:Mo9W14pwbO9VfRe+ygqZ8dFbPpoIK1HFrG/zjTuQ+nc=
+github.com/icrowley/fake v0.0.0-20180203215853-4178557ae428/go.mod h1:uhpZMVGznybq1itEKXj6RYw9I71qK4kH+OGMjRC4KEo=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 h1:mKdxBk7AujPs8kU4m80U72y/zjbZ3UcXC7dClwKbUI0=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/sys v0.0.0-20181213200352-4d1cda033e06 h1:0oC8rFnE+74kEmuHZ46F6KHsMr5Gx2gUQPuNz28iQZM=

password_test.go

@@ -19,9 +19,9 @@ package password
 
 import (
 	"fmt"
-	"math/rand"
 	"testing"
-	"time"
+
+	"github.com/icrowley/fake"
 )
 
 func TestBench(t *testing.T) {
@@ -48,42 +48,15 @@ func TestBench(t *testing.T) {
 	}
 }
 
-var src = rand.NewSource(time.Now().UnixNano())
-
-const (
-	chars         = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()_+<>?/,.:;[]-~`"
-	letterIdxBits = 6                    // 6 bits to represent a letter index
-	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
-	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
-)
-
-func RandStringBytesMaskImprSrc(n int) string {
-	b := make([]byte, n)
-	// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
-	for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
-		if remain == 0 {
-			cache, remain = src.Int63(), letterIdxMax
-		}
-		if idx := int(cache & letterIdxMask); idx < len(chars) {
-			b[i] = chars[idx]
-			i--
-		}
-		cache >>= letterIdxBits
-		remain--
-	}
-
-	return string(b)
-}
-
 func TestHash(t *testing.T) {
 
 	var total int
 	runs := 52
 	// Test expect success
 	for i := 2; i < runs; i++ {
 		// Generate Test Password
-		testUserPass := RandStringBytesMaskImprSrc(i * 4)
-		testMasterPass := RandStringBytesMaskImprSrc(i * 4)
+		testUserPass := fake.Password(i*4, 1000, true, true, true)
+		testMasterPass := fake.Password(i*4, 1000, true, true, true)
 		// Hash Password
 		output, err := Hash(testUserPass, testMasterPass, 0, ScryptParams{N: 32768, R: 16, P: 1}, DefaultParams)
 		if err != nil {