Chaincode Debugging

To debug a chaincode, you can use MockStub to perform unit tests on the chaincode. Before chaincode debugging, import the shim package to the test code. You can refer to the sample test code provided below or the test code provided by Fabric.

Writing Test Code

The test code of Sample Chaincode (1.4) is as follows:

package main

import (
	"fmt"
	"testing"

	"github.com/hyperledger/fabric/core/chaincode/shim"
)

func checkInit(t *testing.T, stub *shim.MockStub, args [][]byte) {
	res := stub.MockInit("1", args)
	if res.Status != shim.OK {
		fmt.Println("Init failed", string(res.Message))
		t.FailNow()
	}
}

func checkState(t *testing.T, stub *shim.MockStub, name string, value string) {
	bytes := stub.State[name]
	if bytes == nil {
		fmt.Println("State", name, "failed to get value")
		t.FailNow()
	}
	if string(bytes) != value {
		fmt.Println("State value", name, "was not", value, "as expected")
		t.FailNow()
	}
}

func checkQuery(t *testing.T, stub *shim.MockStub, name string, value string) {
	res := stub.MockInvoke("1", [][]byte{[]byte("query"), []byte(name)})
	if res.Status != shim.OK {
		fmt.Println("Query", name, "failed", string(res.Message))
		t.FailNow()
	}
	if res.Payload == nil {
		fmt.Println("Query", name, "failed to get value")
		t.FailNow()
	}
	if string(res.Payload) != value {
		fmt.Println("Query value", name, "was not", value, "as expected")
		t.FailNow()
	}
}

func checkInvoke(t *testing.T, stub *shim.MockStub, args [][]byte) {
	res := stub.MockInvoke("1", args)
	if res.Status != shim.OK {
		fmt.Println("Invoke", args, "failed", string(res.Message))
		t.FailNow()
	}
}

func TestExample02_Init(t *testing.T) {
	scc := new(SimpleChaincode)
	stub := shim.NewMockStub("ex02", scc)

	// Init A=123 B=234
	checkInit(t, stub, [][]byte{[]byte("init"), []byte("A"), []byte("123"), []byte("B"), []byte("234")})

	checkState(t, stub, "A", "123")
	checkState(t, stub, "B", "234")
}

func TestExample02_Query(t *testing.T) {
	scc := new(SimpleChaincode)
	stub := shim.NewMockStub("ex02", scc)

	// Init A=345 B=456
	checkInit(t, stub, [][]byte{[]byte("init"), []byte("A"), []byte("345"), []byte("B"), []byte("456")})

	// Query A
	checkQuery(t, stub, "A", "345")

	// Query B
	checkQuery(t, stub, "B", "456")
}

func TestExample02_Invoke(t *testing.T) {
	scc := new(SimpleChaincode)
	stub := shim.NewMockStub("ex02", scc)

	// Init A=567 B=678
	checkInit(t, stub, [][]byte{[]byte("init"), []byte("A"), []byte("567"), []byte("B"), []byte("678")})

	// Invoke A->B for 123
	checkInvoke(t, stub, [][]byte{[]byte("invoke"), []byte("A"), []byte("B"), []byte("123")})
	checkQuery(t, stub, "A", "444")
	checkQuery(t, stub, "B", "801")

	// Invoke B->A for 234
	checkInvoke(t, stub, [][]byte{[]byte("invoke"), []byte("B"), []byte("A"), []byte("234")})
	checkQuery(t, stub, "A", "678")
	checkQuery(t, stub, "B", "567")
	checkQuery(t, stub, "A", "678")
	checkQuery(t, stub, "B", "567")
}