test: add more test to increase test coverage

bcrypt/bcrypt.go

@@ -2,7 +2,6 @@
 package bcrypt
 
 import (
-	"fmt"
 	"golang.org/x/crypto/bcrypt"
 )
 
@@ -12,13 +11,8 @@ type bcryptImpl int
 // Hash generates a bcrypt hash from the specified plaintext password using the configured cost.
 // It returns the resulting hash as a string and any errors that occur during the hash generation.
 func (b bcryptImpl) Hash(plain string) (string, error) {
-	switch b {
-	default:
-		return "", fmt.Errorf("passwd: bcryptImpl: hash: unsuported cost")
-	case DefaultCost:
-		b, err := bcrypt.GenerateFromPassword([]byte(plain), bcrypt.DefaultCost)
-		return string(b), err
-	}
+	hash, err := bcrypt.GenerateFromPassword([]byte(plain), int(b))
+	return string(hash), err
 }
 
 // Compare compares the specified plaintext password with the specified bcrypt hash.
@@ -27,5 +21,6 @@ func (b bcryptImpl) Compare(hash string, plain string) error {
 	return bcrypt.CompareHashAndPassword([]byte(hash), []byte(plain))
 }
 
-// DefaultCost is a bcrypt algorithm with default cost.
-const DefaultCost = bcryptImpl(1)
+const DefaultCost = bcryptImpl(bcrypt.DefaultCost) // DefaultCost is a bcrypt algorithm with default cost.
+const MaxCost = bcryptImpl(bcrypt.MaxCost)         // MaxCost is a bcrypt algorithm with max cost.
+const MinCost = bcryptImpl(bcrypt.MinCost)         // MinCost is a bcrypt algorithm with min cost.

bcrypt/bcrypt_test.go

@@ -0,0 +1,28 @@
+package bcrypt_test
+
+import (
+	"github.com/pkg-id/passwd"
+	"github.com/pkg-id/passwd/bcrypt"
+	"testing"
+)
+
+func TestBcryptImpl(t *testing.T) {
+	impls := []passwd.HashComparer{
+		bcrypt.MinCost,
+		bcrypt.DefaultCost,
+		bcrypt.MinCost,
+	}
+
+	const plain = "abc123"
+
+	for _, impl := range impls {
+		hash, err := impl.Hash(plain)
+		if err != nil {
+			t.Fatalf("expect no error; got an error: %v", err)
+		}
+
+		if err := impl.Compare(hash, plain); err != nil {
+			t.Errorf("expect password is match")
+		}
+	}
+}

passwd.go

@@ -44,10 +44,7 @@ type Password string
 // It returns an error if the hash generation fails.
 func (p Password) Value() (driver.Value, error) {
 	hash, err := hashComparer.Hash(string(p))
-	if err != nil {
-		return nil, fmt.Errorf("passwd: Password.Value: generate hash: %w", err)
-	}
-	return driver.Value(hash), nil
+	return driver.Value(hash), err
 }
 
 // Scan implements the sql.Scanner interface. It sets the password value to an empty string if the source value is nil.

passwd_test.go

@@ -3,12 +3,14 @@ package passwd_test
 import (
 	"encoding/json"
 	"github.com/pkg-id/passwd"
+	passwdBcrypt "github.com/pkg-id/passwd/bcrypt"
 	"golang.org/x/crypto/bcrypt"
 	"strings"
 	"testing"
 )
 
 func TestPassword_Value(t *testing.T) {
+	passwd.SetHashComparer(passwdBcrypt.DefaultCost)
 	pwd := passwd.Password("pass1234")
 	value, err := pwd.Value()
 	if err != nil {
@@ -34,7 +36,7 @@ func TestPassword_Scan(t *testing.T) {
 		t.Errorf("value: expected no error, but got an error: %v", err)
 	}
 
-	src := value.(string)
+	src := []byte(value.(string))
 	var scanned passwd.Password
 	if err := scanned.Scan(src); err != nil {
 		t.Errorf("scan: expected no error, but got an error: %v", err)