Function TestEmptyTurnEmitsWarning

pkg/runtime/runtime_test.go:4212–4229

TestEmptyTurnEmitsWarning verifies that a wholly empty turn (no content, no reasoning, no tool calls) - e.g. a rate-limited or token-capped provider that returns a bare [DONE] stream, the dominant cause of empty replies on OVHcloud's free tier in #3145 - is surfaced as a Warning instead of terminati

(t *testing.T)

// returns a bare [DONE] stream, the dominant cause of empty replies on OVHcloud's
// free tier in #3145 - is surfaced as a Warning instead of terminating silently.
func TestEmptyTurnEmitsWarning(t *testing.T) {
	stream := newStreamBuilder().
		AddStopWithUsage(5, 0).
		Build()

	sess := session.New(session.WithUserMessage("hello"))
	events := runSession(t, sess, stream)

	var warn *WarningEvent
	for _, ev := range events {
		if w, ok := ev.(*WarningEvent); ok {
			warn = w
		}
	}

	require.NotNil(t, warn, "expected a Warning event for an empty turn")
	assert.Contains(t, warn.Message, "empty response")
}

// TestEmptyTrailingTurnAfterToolCallsIsSilent verifies that a natural empty
// stop immediately following a tool-call turn does NOT emit the empty-response