tests: define cancun-to-prague at 15K chainconig (ethereum#29557)

tests: add cancun->prague config

Author: marioevz

tests/init.go

@@ -357,6 +357,26 @@ var Forks = map[string]*params.ChainConfig{
 		CancunTime:              u64(0),
 		PragueTime:              u64(0),
 	},
+	"CancunToPragueAtTime15k": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(15_000),
+	},
 }
 
 // AvailableForks returns the set of defined fork names