test: add Drop to fuzz test, add drop test cases

cuckoo_fuzz_test.go

@@ -3,6 +3,7 @@ package cuckoo_test
 import (
 	"bytes"
 	"encoding/binary"
+	"maps"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -23,27 +24,45 @@ func FuzzInsertLookup(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte, seedA, seedB uint32) {
 		assert := assert.New(t)
 
-		table := cuckoo.NewCustomTable[uint32, uint32](
+		actual := cuckoo.NewCustomTable[uint32, uint32](
 			offsetHash(seedA),
 			offsetHash(seedB),
 			func(a, b uint32) bool { return a == b },
 		)
 
+		expected := map[uint32]uint32{}
+
 		if seedA == seedB {
 			return
 		}
 
 		r := bytes.NewReader(data)
 		var key, value uint32
+		var drop bool
 		for binary.Read(r, binary.LittleEndian, &key) == nil &&
 			binary.Read(r, binary.LittleEndian, &value) == nil {
 
-			err := table.Put(key, value)
-			assert.NoError(err)
+			if drop {
+				err := actual.Drop(key)
+				assert.NoError(err)
 
-			found, err := table.Get(key)
-			assert.NoError(err)
-			assert.Equal(value, found)
+				delete(expected, key)
+
+				_, err = actual.Get(key)
+				assert.Error(err)
+			} else {
+				err := actual.Put(key, value)
+				assert.NoError(err)
+
+				expected[key] = value
+
+				found, err := actual.Get(key)
+				assert.NoError(err)
+				assert.Equal(value, found)
+			}
+			assert.Equal(expected, maps.Collect(actual.Entries()))
+
+			drop = !drop
 		}
 	})
 }