1 files changed, 4 insertions, 0 deletions
diff --git a/db_test.go b/db_test.go
index 310dfad..e689836 100644
--- a/db_test.go
+++ b/db_test.go
@@ -354,9 +354,13 @@ func TestDB_String(t *testing.T) {
 func TestDBStats_Sub(t *testing.T) {
 	var a, b Stats
 	a.TxStats.PageCount = 3
+	a.FreePageN = 4
 	b.TxStats.PageCount = 10
+	b.FreePageN = 14
 	diff := b.Sub(&a)
 	assert.Equal(t, 7, diff.TxStats.PageCount)
+	// free page stats are copied from the receiver and not subtracted
+	assert.Equal(t, 14, diff.FreePageN)
 }
 
 // Ensure that meta with bad magic is invalid.