core/rawdb: improve tests

core/rawdb/ancienttest/testsuite.go

@@ -263,6 +263,17 @@ func basicWrite(t *testing.T, newFn func(kinds []string) ethdb.AncientStore) {
 
 	// Write should work after truncating from tail but over the head
 	db.TruncateTail(200)
+	head, err := db.Ancients()
+	if err != nil {
+		t.Fatalf("Failed to retrieve head ancients %v", err)
+	}
+	tail, err := db.Tail()
+	if err != nil {
+		t.Fatalf("Failed to retrieve tail ancients %v", err)
+	}
+	if head != 200 || tail != 200 {
+		t.Fatalf("Ancient head and tail are not expected")
+	}
 	_, err = db.ModifyAncients(func(op ethdb.AncientWriteOp) error {
 		offset := uint64(200)
 		for i := 0; i < 100; i++ {
@@ -278,6 +289,17 @@ func basicWrite(t *testing.T, newFn func(kinds []string) ethdb.AncientStore) {
 	if err != nil {
 		t.Fatalf("Failed to write ancient data %v", err)
 	}
+	head, err = db.Ancients()
+	if err != nil {
+		t.Fatalf("Failed to retrieve head ancients %v", err)
+	}
+	tail, err = db.Tail()
+	if err != nil {
+		t.Fatalf("Failed to retrieve tail ancients %v", err)
+	}
+	if head != 300 || tail != 200 {
+		t.Fatalf("Ancient head and tail are not expected")
+	}
 }
 
 func nonMutable(t *testing.T, newFn func(kinds []string) ethdb.AncientStore) {

core/rawdb/freezer_memory.go

@@ -397,6 +397,9 @@ func (f *MemoryFreezer) TruncateTail(tail uint64) (uint64, error) {
 		}
 	}
 	f.tail = tail
+	if f.items < tail {
+		f.items = tail
+	}
 	return old, nil
 }