Add fuzz testing for Section encoding/decoding with multiple edge cases

level/section_test.go

@@ -0,0 +1,43 @@
+package level_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/admin-else/strom/level"
+)
+
+func FuzzSectionDeEnCodePacket(f *testing.F) {
+	f.Fuzz(func(t *testing.T, raw []byte) {
+		r := bytes.NewReader(raw)
+		s1, err := level.SectionDecodePacket(r, TestVersion)
+		if err != nil {
+			t.Skipf("decode failed: %v", err)
+			return
+		}
+
+		buf := bytes.NewBuffer(nil)
+		err = level.SectionEncodePacket(buf, s1)
+		if err != nil {
+			t.Fatal(err)
+			return
+		}
+
+		s2, err := level.SectionDecodePacket(buf, TestVersion)
+		if err != nil {
+			t.Fatal(err)
+			return
+		}
+
+		if s1.BlockCount != s2.BlockCount {
+			t.Error("BlockCount mismatch")
+		}
+		if level.CompareStorage(s1.Blocks, s2.Blocks) {
+			t.Error("Blocks mismatch")
+		}
+		if level.CompareStorage(s1.Biomes, s2.Biomes) {
+			t.Error("Biomes mismatch")
+		}
+
+	})
+}