// shutting down, so give it some time.
		time.Sleep(1 * time.Millisecond)
	}
	t.Errorf("Test appears to have leaked %s:\n%s", bad, stacks)
}

// waitCondition waits for fn to return true,
// checking immediately and then at exponentially increasing intervals.
func waitCondition(t testing.TB, delay time.Duration, fn func(time.Duration) bool) {
	t.Helper()
	start := time.Now()
	var since time.Duration
	for !fn(since) {

func waitForFree(t *testing.T, db *DB, want int) {
	var numFree int
	if !waitCondition(t, func() bool {
		numFree = db.numFreeConns()
		return numFree == want
	}) {
		t.Fatalf("free conns after hitting EOF = %d; want %d", numFree, want)
	}
}

func waitForRowsClose(t *testing.T, rows *Rows) {
	if !waitCondition(t, func() bool {
		rows.closemu.RLock()
		defer rows.closemu.RUnlock()
		return rows.closed

			t.Fatalf("%s: %v", name, err)
		}
		t.Logf("%s: ok (%q)", name, slurp)
	}

	doReq("first")
	keys1 := tr.IdleConnKeysForTesting()

	ts.CloseClientConnections()

	var keys2 []string
	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
		keys2 = tr.IdleConnKeysForTesting()
		if len(keys2) != 0 {
			if d > 0 {

	}
	logOutput := func() string {
		errorLog.Lock()
		defer errorLog.Unlock()
		return errorLog.String()
	}
	wantStackLogged := panicValue != nil && panicValue != ErrAbortHandler

	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
		gotLog := logOutput()
		if !wantStackLogged {
			if gotLog == "" {
				return true
			}
			t.Fatalf("want no log output; got: %s", gotLog)
		}

		t.Errorf("found %d idle conns (%q); want 1", len(conns), conns)
	}

	// SetKeepAlivesEnabled should discard idle conns.
	ts.Config.SetKeepAlivesEnabled(false)

	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
		if conns := tr.IdleConnStrsForTesting(); len(conns) > 0 {
			if d > 0 {
				t.Logf("idle conns %v after SetKeepAlivesEnabled called = %q; waiting for empty", d, conns)

			if tc.wantConditions != nil {
				for _, wantCondition := range *tc.wantConditions {
					conditions := getConditionsByType(actual.Status.Conditions, wantCondition.Type)
					if len(conditions) != 1 {
						t.Fatalf("Expected a single completion condition. Got %#v for type: %q", conditions, wantCondition.Type)
					}
					condition := *conditions[0]