fix: 按 K-00 约定修复 Go SDK 断线重交与退避

sdk/go/export_test.go

@@ -0,0 +1,50 @@
+package nixmsg
+
+import (
+	"testing"
+	"time"
+)
+
+// DisableJitterForTest 让退避/限速等待等于标称值，便于单测。
+func DisableJitterForTest(t testing.TB) {
+	t.Helper()
+	orig := backoffJitter
+	backoffJitter = func(d time.Duration) time.Duration { return d }
+	t.Cleanup(func() { backoffJitter = orig })
+}
+
+func NominalDelayForTest(n int) time.Duration { return nominalDelay(n) }
+
+func (b *reconnectBackoff) NextWaitNoJitterForTest() time.Duration {
+	return b.nextWait(false)
+}
+
+func (b *reconnectBackoff) SetOnlineAtForTest(t time.Time) {
+	b.setOnlineAtForTest(t)
+}
+
+func (c *Client) LastStopCodeForTest() string {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.lastStopCode
+}
+
+func (c *Client) DedupHasForTest(key string) bool {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.store.Has(key)
+}
+
+func (c *Client) DedupPutForTest(key string, st dedupState) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.store.Put(key, &dedupEntry{state: st})
+}
+
+func (c *Client) DedupDeleteForTest(key string) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.store.Delete(key)
+}
+
+func DefaultKeepAliveSecondsForTest() int { return DefaultKeepAliveSeconds }