fix

internal/modules/password_generator/generator.go

@@ -6,7 +6,7 @@ import (
 )
 
 const (
-	charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	charset = "abcdefghijklmnopqrstuvwxyz"
 )
 
 type generator struct {

internal/modules/password_generator/generator_test.go

@@ -0,0 +1,21 @@
+package password_generator
+
+import "testing"
+
+func TestGenerate(t *testing.T) {
+	g := NewGenerator(8)
+	for range 100 {
+		password, err := g.Generate()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(password) != 8 {
+			t.Fatalf("password length = %d, want 8", len(password))
+		}
+		for _, char := range password {
+			if char < 'a' || char > 'z' {
+				t.Fatal("password contains a character outside a-z")
+			}
+		}
+	}
+}