Small fixes

atoll.go

@@ -5,7 +5,7 @@ package atoll
 import "math"
 
 // 1 trillion is the number of guesses per second Edward Snowden said we should be prepared for.
-const guessesPerSecond = 1000000000000000
+const guessesPerSecond = 1000000000000
 
 // Secret is the interface that wraps the basic method Generate.
 type Secret interface {

password.go

@@ -255,8 +255,6 @@ func (p *Password) validateLevels(levels map[int]struct{}) error {
 	)
 
 	for l := range levels {
-		fail := true
-
 		switch l {
 		case 1:
 			set = lowerCase
@@ -274,14 +272,14 @@ func (p *Password) validateLevels(levels map[int]struct{}) error {
 			levelName = "special"
 		}
 
+		counter := 0
 		for _, excl := range p.Exclude {
-			if !strings.Contains(set, string(excl)) {
-				fail = false
-				break
+			if strings.Contains(set, string(excl)) {
+				counter++
 			}
 		}
 
-		if fail {
+		if counter == len(set) {
 			return fmt.Errorf("%s level is used and all its characters are excluded", levelName)
 		}
 	}

password_test.go

@@ -160,13 +160,13 @@ func TestInvalidPassword(t *testing.T) {
 		},
 		"digit level is used and all the characters are excluded": {
 			Length:  10,
-			Format:  []int{3, 4},
-			Exclude: digit,
+			Format:  []int{1, 3, 4},
+			Exclude: digit + "aB",
 		},
 		"space level is used and all the characters are excluded": {
 			Length:  1,
 			Format:  []int{4},
-			Exclude: space,
+			Exclude: space + "/",
 		},
 		"special level is used and all the characters are excluded": {
 			Length:  20,