core/forkid: add forkid test for holesky (#28193)

core/forkid/forkid_test.go

@@ -107,6 +107,16 @@ func TestCreation(t *testing.T) {
 				{1735372, 1677557088, ID{Hash: checksumToBytes(0xf7f9bc08), Next: 0}},          // First Shanghai block
 			},
 		},
+		// Holesky test cases
+		{
+			params.HoleskyChainConfig,
+			core.DefaultHoleskyGenesisBlock().ToBlock(),
+			[]testcase{
+				{0, 0, ID{Hash: checksumToBytes(0xc61a6098), Next: 1696000704}},   // Unsynced, last Frontier, Homestead, Tangerine, Spurious, Byzantium, Constantinople, Petersburg, Istanbul, Berlin, London, Paris block
+				{123, 0, ID{Hash: checksumToBytes(0xc61a6098), Next: 1696000704}}, // First MergeNetsplit block
+				{123, 1696000704, ID{Hash: checksumToBytes(0xfd4f016b), Next: 0}}, // Last MergeNetsplit block
+			},
+		},
 	}
 	for i, tt := range tests {
 		for j, ttt := range tt.cases {