Add new configuration options and tests

This commit introduces new methods to enable HIBP checks, exclude specific characters, and set a fixed password length in the password generator configuration. It also includes tests to verify that these new options work correctly in the password configuration.

config.go

@@ -88,6 +88,28 @@ func WithAlgorithm(algo Algorithm) Option {
 	}
 }
 
+// WithCheckHIBP enables the HIBP check for newly generated passwords
+func WithCheckHIBP() Option {
+	return func(config *Config) {
+		config.CheckHIBP = true
+	}
+}
+
+// WithExcludeChars sets a list of characters to be excluded in the generated
+// passwords
+func WithExcludeChars(chars string) Option {
+	return func(config *Config) {
+		config.ExcludeChars = chars
+	}
+}
+
+// WithFixedLength sets a fixed password length
+func WithFixedLength(length int64) Option {
+	return func(config *Config) {
+		config.FixedLength = length
+	}
+}
+
 // WithMinLength overrides the minimum password length
 func WithMinLength(length int64) Option {
 	return func(config *Config) {

config_test.go

@@ -63,6 +63,44 @@ func TestWithAlgorithm(t *testing.T) {
 	}
 }
 
+func TestWithCheckHIBP(t *testing.T) {
+	c := NewConfig(WithCheckHIBP())
+	if c == nil {
+		t.Errorf("NewConfig(WithCheckHIBP()) failed, expected config pointer but got nil")
+		return
+	}
+	if c.CheckHIBP != true {
+		t.Errorf("NewConfig(WithCheckHIBP()) failed, expected min length: %t, got: %t",
+			true, c.CheckHIBP)
+	}
+}
+
+func TestWithExcludeChars(t *testing.T) {
+	e := "abcdefg"
+	c := NewConfig(WithExcludeChars(e))
+	if c == nil {
+		t.Errorf("NewConfig(WithExcludeChars()) failed, expected config pointer but got nil")
+		return
+	}
+	if c.ExcludeChars != e {
+		t.Errorf("NewConfig(WithExcludeChars()) failed, expected min length: %s, got: %s",
+			e, c.ExcludeChars)
+	}
+}
+
+func TestWithFixedLength(t *testing.T) {
+	var e int64 = 10
+	c := NewConfig(WithFixedLength(e))
+	if c == nil {
+		t.Errorf("NewConfig(WithFixedLength()) failed, expected config pointer but got nil")
+		return
+	}
+	if c.FixedLength != e {
+		t.Errorf("NewConfig(WithFixedLength()) failed, expected min length: %d, got: %d",
+			e, c.FixedLength)
+	}
+}
+
 func TestWithMaxLength(t *testing.T) {
 	var e int64 = 123
 	c := NewConfig(WithMaxLength(e))