Gripmock Embedded

Fork of tokopedia/gripmock - Embedded gripmock library for Go that provides in-process gRPC mocking without external dependencies.

This is a fork of the original gripmock project, modified to support embedded/in-process gRPC mocking for better integration testing experience.

Quick Start

1. Initialize embedded gripmock in your TestMain:

func TestMain(m *testing.M) {
    err := gripmock.InitEmbeddedGripmock("../../../protos", []int{4771, 4772, 4773, 4774, 4775})
    if err != nil {
        panic(fmt.Sprintf("Failed to initialize embedded gripmock: %v", err))
    }
    defer gripmock.StopEmbeddedGripmock()

    // Run all tests
    os.Exit(m.Run())
}

2. Use in tests:

func TestExample(t *testing.T) {
    // Clear any existing stubs
    err := gripmock.Clear()
    require.NoError(t, err)

    // Add stubs
    err = gripmock.AddStub("proto_internal.ProtoInternalService", "transfer_tokens", nil, nil)
    require.NoError(t, err)

    // Your logic tests go here...
}

File Structure

• gripmock.go - Core server implementation
• embedded.go - Main API and drop-in replacement functions
• manager.go - Multi-server management
• mocker.go - gRPC request handling and protobuf conversion

API Reference

Global Functions

• InitEmbeddedGripmock(protoDir, ports) - Initialize servers
• StopEmbeddedGripmock() - Stop all servers
• AddStub(service, method, input, output) - Add mock stub
• Clear() - Remove all stubs
• GetActivePorts() - Get running server ports
• IsRunning() - Check if servers are running

Advanced Usage

For more control, you can use the underlying types:

// Create individual servers
server, err := gripmock.NewServer(9001, []string{"path/to/service.proto"})
if err != nil {
    log.Fatal(err)
}

// Start server
ctx := context.Background()
if err := server.Start(ctx); err != nil {
    log.Fatal(err)
}
defer server.Stop()

// Create mocker for the server
mocker := gripmock.NewEmbeddedMocker(server)
err = mocker.AddStub("MyService", "MyMethod", inputData, outputData)

Requirements

• Go 1.24+