feat: authsession service

authsession/internal/testkit/code_generator.go

@@ -0,0 +1,35 @@
+package testkit
+
+import (
+	"errors"
+	"strings"
+
+	"galaxy/authsession/internal/ports"
+)
+
+// FixedCodeGenerator is a deterministic CodeGenerator double that always
+// returns the same code or error.
+type FixedCodeGenerator struct {
+	// Code stores the fixed code returned by Generate when Err is nil.
+	Code string
+
+	// Err is returned directly from Generate when set.
+	Err error
+}
+
+// Generate returns the configured fixed code.
+func (g FixedCodeGenerator) Generate() (string, error) {
+	if g.Err != nil {
+		return "", g.Err
+	}
+	switch {
+	case strings.TrimSpace(g.Code) == "":
+		return "", errors.New("fixed code generator code must not be empty")
+	case strings.TrimSpace(g.Code) != g.Code:
+		return "", errors.New("fixed code generator code must not contain surrounding whitespace")
+	default:
+		return g.Code, nil
+	}
+}
+
+var _ ports.CodeGenerator = FixedCodeGenerator{}