feat: authsession service

authsession/internal/testkit/clock.go

@@ -0,0 +1,15 @@
+package testkit
+
+import "time"
+
+// FixedClock is a deterministic Clock double that always returns the same
+// instant.
+type FixedClock struct {
+	// Time is the instant returned by Now.
+	Time time.Time
+}
+
+// Now returns the configured instant.
+func (c FixedClock) Now() time.Time {
+	return c.Time
+}