Use a Mock Shim to Test a Chaincode

This method of testing involves using a mock version of the stub shim.ChaincodeStubInterface. With this you can simulate some functionality of your chaincode before deploying it to Oracle Blockchain Platform. You can also use this library to build unit tests for your chaincode.

1. Create a test file that matches the name of the chaincode file.
   For example, if car_dealer.go is the actual implementation code for you smart contract, you would create a test suite called car_dealer_test.go containing all the tests for car_dealer.go. The test suite filename should be in the *_test.go format.
2. Create your package and import statements.

   package main
   
   import (
       "fmt"
       "testing"
   
       "github.com/hyperledger/fabric/core/chaincode/shim"
   )

3. Create your unit test.

   /*
   * TestInvokeInitVehiclePart simulates an initVehiclePart transaction on the CarDemo cahincode
    */
   func TestInvokeInitVehiclePart(t *testing.T) {
       fmt.Println("Entering TestInvokeInitVehiclePart")
   
       // Instantiate mockStub using CarDemo as the target chaincode to unit test
       stub := shim.NewMockStub("mockStub", new(CarDemo))
       if stub == nil {
           t.Fatalf("MockStub creation failed")
       }
   
       var serialNumber = "ser1234"
   
       // Here we perform a "mock invoke" to invoke the function "initVehiclePart" method with associated parameters
       // The first parameter is the function we are invoking
       result := stub.MockInvoke("001",
           [][]byte{[]byte("initVehiclePart"),
               []byte(serialNumber),
               []byte("tata"),
               []byte("1502688979"),
               []byte("airbag 2020"),
               []byte("aaimler ag / mercedes")})
   
       // We expect a shim.ok if all goes well
       if result.Status != shim.OK {
           t.Fatalf("Expected unauthorized user error to be returned")
       }
   
       // here we validate we can retrieve the vehiclePart object we just committed by serianNumber
       valAsbytes, err := stub.GetState(serialNumber)
       if err != nil {
           t.Errorf("Failed to get state for " + serialNumber)
       } else if valAsbytes == nil {
           t.Errorf("Vehicle part does not exist: " + serialNumber)
       }
   }

Note:

Not all interfaces of the stub are implemented. Stub functions

• GetQueryResult

• GetHistoryForKey

are not supported, and attempting to call either of these will result in an error.