You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: assert_test.go
    path of file: ./repos/goutil/errorx
    
    the code of the file until where you have to start completion: package errorx_test

import (
	"testing"

	"github.com/gookit/goutil/errorx"
	"github.com/gookit/goutil/testutil/assert"
)

func TestAssert_methods(t *testing.T) {
	// IsFalse
	assert.NoErr(t, errorx.IsFalse(false))
	assert.Err(t, errorx.IsFalse(true))
	assert.Err(t, errorx.IsFalse(true, "error msg"))

	// IsTrue
	assert.NoErr(t, errorx.IsTrue(true))
	assert.Err(t, errorx.IsTrue(false))

	// IsIn
	assert.NoErr(t, errorx.IsIn(1, []int{1, 2, 3}))
	assert.Err(t, errorx.IsIn(4, []int{1, 2, 3}))
	assert.Err(t
    
func TestAssert_methods(t *testing.T) {
	// IsFalse
	assert.NoErr(t, errorx.IsFalse(false))
	assert.Err(t, errorx.IsFalse(true))
	assert.Err(t, errorx.IsFalse(true, "error msg"))

	// IsTrue
	assert.NoErr(t, errorx.IsTrue(true))
	assert.Err(t, errorx.IsTrue(false))

	// IsIn
	assert.NoErr(t, errorx.IsIn(1, []int{1, 2, 3}))
	assert.Err(t, errorx.IsIn(4, []int{1, 2, 3}))
	assert.Err(t, errorx.IsIn(4, []int{1, 2, 3}, "error msg"))
	assert.Err(t, errorx.IsIn(4, []int{1, 2, 3}, "error %s", "msg"))

	// NotIn
	assert.NoErr(t, errorx.NotIn(4, []int{1, 2, 3}))
	assert.Err(t, errorx.NotIn(1, []int{1, 2, 3}))
	assert.Err(t, errorx.NotIn(1, []int{1, 2, 3}, "error msg"))
}