accounts/abi/bind/v2: update tests

- add go:generate lines for updating the test bindings
- move tests to bind_test package because the contracts now import bind/v2
- simplify some code in tests

Author: fjl

accounts/abi/bind/v2/generate_test.go

@@ -0,0 +1,100 @@
+// Copyright 2024 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package bind_test
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	bind1 "github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/common/compiler"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+//go:generate go run github.com/ethereum/go-ethereum/cmd/abigen -v2 -combined-json internal/contracts/db/combined-abi.json -type DBStats -pkg db -out internal/contracts/db/bindings.go
+//go:generate go run github.com/ethereum/go-ethereum/cmd/abigen -v2 -combined-json internal/contracts/events/combined-abi.json -type C -pkg events -out internal/contracts/events/bindings.go
+//go:generate go run github.com/ethereum/go-ethereum/cmd/abigen -v2 -combined-json internal/contracts/nested_libraries/combined-abi.json -type C1 -pkg nested_libraries -out internal/contracts/nested_libraries/bindings.go
+//go:generate go run github.com/ethereum/go-ethereum/cmd/abigen -v2 -combined-json internal/contracts/solc_errors/combined-abi.json -type C -pkg solc_errors -out internal/contracts/solc_errors/bindings.go
+//go:generate go run github.com/ethereum/go-ethereum/cmd/abigen -v2 -combined-json internal/contracts/uint256arrayreturn/combined-abi.json -type C -pkg uint256arrayreturn -out internal/contracts/uint256arrayreturn/bindings.go
+
+// TestBindingGeneration tests that re-running generation of bindings does not result in
+// mutations to the binding code.
+func TestBindingGeneration(t *testing.T) {
+	matches, _ := filepath.Glob("internal/contracts/*")
+	var dirs []string
+	for _, match := range matches {
+		f, _ := os.Stat(match)
+		if f.IsDir() {
+			dirs = append(dirs, f.Name())
+		}
+	}
+
+	for _, dir := range dirs {
+		var (
+			abis  []string
+			bins  []string
+			types []string
+			libs  = make(map[string]string)
+		)
+		basePath := filepath.Join("internal/contracts", dir)
+		combinedJsonPath := filepath.Join(basePath, "combined-abi.json")
+		abiBytes, err := os.ReadFile(combinedJsonPath)
+		if err != nil {
+			t.Fatalf("error trying to read file %s: %v", combinedJsonPath, err)
+		}
+		contracts, err := compiler.ParseCombinedJSON(abiBytes, "", "", "", "")
+		if err != nil {
+			t.Fatalf("Failed to read contract information from json output: %v", err)
+		}
+
+		for name, contract := range contracts {
+			// fully qualified name is of the form <solFilePath>:<type>
+			nameParts := strings.Split(name, ":")
+			typeName := nameParts[len(nameParts)-1]
+			abi, err := json.Marshal(contract.Info.AbiDefinition) // Flatten the compiler parse
+			if err != nil {
+				utils.Fatalf("Failed to parse ABIs from compiler output: %v", err)
+			}
+			abis = append(abis, string(abi))
+			bins = append(bins, contract.Code)
+			types = append(types, typeName)
+
+			// Derive the library placeholder which is a 34 character prefix of the
+			// hex encoding of the keccak256 hash of the fully qualified library name.
+			// Note that the fully qualified library name is the path of its source
+			// file and the library name separated by ":".
+			libPattern := crypto.Keccak256Hash([]byte(name)).String()[2:36] // the first 2 chars are 0x
+			libs[libPattern] = typeName
+		}
+		code, err := bind1.BindV2(types, abis, bins, dir, libs, make(map[string]string))
+		if err != nil {
+			t.Fatalf("error creating bindings for package %s: %v", dir, err)
+		}
+
+		existingBindings, err := os.ReadFile(filepath.Join(basePath, "bindings.go"))
+		if err != nil {
+			t.Fatalf("ReadFile returned error: %v", err)
+		}
+		if code != string(existingBindings) {
+			t.Fatalf("code mismatch for %s", dir)
+		}
+	}
+}