Add tests to verify password functionality

password.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"crypto/rand"
+	"errors"
 )
 
 const (
@@ -14,25 +15,34 @@ const (
 
 type PasswordGenerator func(int) string
 
+type password struct {
+	Password string
+	Upper    int
+	Lower    int
+	Number   int
+	Special  int
+}
+
 func GenerateSecurePassword(n int) string {
 	for {
 		p, err := generatePassword(n)
 		if err != nil {
 			continue
 		}
-		if p.Password[0] != '-' &&
-			(p.Upper > 0 || p.Lower > 0 || p.Number > 0 || p.Special > 0) {
+
+		err = ValidatePassword(p)
+		if err == nil {
 			return p.Password
 		}
 	}
 }
 
-type password struct {
-	Password string
-	Upper    int
-	Lower    int
-	Number   int
-	Special  int
+func ValidatePassword(p password) error {
+	if p.Password[0] != '-' &&
+		(p.Upper > 0 || p.Lower > 0 || p.Number > 0 || p.Special > 0) {
+		return nil
+	}
+	return errors.New("Invalid password")
 }
 
 func (p *password) AddChar(idx int) {

password_test.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("password", func() {
+	var (
+		badPassword  password
+		goodPassword password
+	)
+
+	BeforeEach(func() {
+		badPassword = password{Password: "-badpassword", Upper: 0, Lower: 11, Number: 0, Special: 1}
+		goodPassword = password{Password: "goodpassword", Upper: 0, Lower: 12, Number: 0, Special: 0}
+	})
+
+	Describe("Password generation", func() {
+		Context("With a leading dash", func() {
+			It("should generate a new password", func() {
+				Expect(ValidatePassword(badPassword)).To(MatchError("Invalid password"))
+			})
+		})
+		Context("Without a leading dash", func() {
+			It("should accept the password", func() {
+				Expect(ValidatePassword(goodPassword)).To(BeNil())
+			})
+		})
+	})
+})