package towel

import (
	"context"
	"testing"
)

// TestClientIP pins plan 07's client address on the context (B-IN-04): the
// value round-trips, an absent value answers false, and an empty address
// is stored as given.
func TestClientIP(t *testing.T) {
	t.Run("round trip", func(t *testing.T) {
		ip, ok := ClientIP(WithClientIP(context.Background(), "203.0.113.7"))
		if !ok || ip != "203.0.113.7" {
			t.Fatalf("ClientIP = %q, %v", ip, ok)
		}
	})
	t.Run("absent", func(t *testing.T) {
		if ip, ok := ClientIP(context.Background()); ok || ip != "" {
			t.Fatalf("ClientIP(empty context) = %q, %v", ip, ok)
		}
		if ip, ok := ClientIP(WithLocale(context.Background(), "pl")); ok || ip != "" {
			t.Fatalf("ClientIP(other values only) = %q, %v", ip, ok)
		}
	})
	t.Run("empty string", func(t *testing.T) {
		ip, ok := ClientIP(WithClientIP(context.Background(), ""))
		if !ok || ip != "" {
			t.Fatalf("ClientIP(empty address) = %q, %v", ip, ok)
		}
	})
}