parallel

🤹 Parallel

Testo plugin for making all tests parallel by default.

Go has great support for parallel tests. But marking a test as parallel requires an explicit t.Parallel() call. This plugin does that for you!

Quick Start

go get github.com/ozontech/testo-toppings

Add it to your T:

package main

import (
	"github.com/ozontech/testo"
	"github.com/ozontech/testo-toppings/parallel"
)

type T struct {
	*testo.T
	*parallel.PluginParallel
}

All your tests are now parallel by default!

Note

With this plugin enabled, explicit calls to t.Parallel() are no-op.

Use annotations to mark any test as synchronous:

var _ = testo.For(Suite.TestFoo, parallel.WithSync())

func (Suite) TestFoo(t T) {
    // ...
}

To make all tests synchronous pass -parallel.sync flag to go test:

go test ./... -parallel.sync

Scopes

Tests can be parallelized to a different extents.

This is configured through "scopes".

Available scopes:

const (
	// SuiteTests is a [Scope] that covers suite tests.
	//
	// For example:
	//
	// 	func (Suite) TestA(t T) { ... }
	// 	func (Suite) TestB(t T) { ... }
	//
	// Tests A & B will be marked as parallel.
	//
	// This is a default value.
	SuiteTests Scope = 1 << iota

	// Suites is a [Scope] that covers suites but not their tests.
	//
	// For example:
	//
	// 	func Test(t *testing.T) {
	//		testo.RunSuite(t, new(Suite))
	//		testo.RunSuite(t, new(OtherSuite))
	// 	}
	//
	// Both of these suites will be run in parallel.
	Suites

	// Tests is a [Scope] that covers native tests.
	//
	// For example:
	//
	// 	func TestA(t *testing.T) {
	//		testo.RunSuite(t, new(Suite))
	// 	}
	//
	// 	func TestA(t *testing.T) {
	//		testo.RunSuite(t, new(OtherSuite))
	// 	}
	//
	// Tests A & B will be run in parallel.
	Tests
)

Scopes are configured with WithScope option:

// WithScope sets a [Scope] of a plugin.
// Scope defines to what extent tests should become parallel.
//
// This plugin, by default, marks as parallel only suites' tests.
// You may want to extend its reach to suites as a whole, so that,
// say, multiple runs to [testo.RunSuite] will also run in parallel.
//
//	parallel.WithScope(parallel.SuiteTests | parallel.Suites)
//
// It's also possible to mark "native" tests as parallel by adding a [Tests] scope.
//
//	parallel.WithScope(parallel.SuiteTests | parallel.Suites | parallel.Tests)
func WithScope(scope Scope) testoplugin.Option