detect_test.go

package yarn_test

import (
	"os"
	"testing"

	"github.com/paketo-buildpacks/packit/v2"
	"github.com/paketo-buildpacks/yarn"
	"github.com/sclevine/spec"

	. "github.com/onsi/gomega"
)

func testDetect(t *testing.T, context spec.G, it spec.S) {
	var (
		Expect = NewWithT(t).Expect

		workingDir string
		detect     packit.DetectFunc
	)

	it.Before(func() {
		var err error
		workingDir, err = os.MkdirTemp("", "working-dir")
		Expect(err).NotTo(HaveOccurred())

		detect = yarn.Detect()
	})

	it.After(func() {
		Expect(os.RemoveAll(workingDir)).To(Succeed())
	})

	it("provides yarn as a dependency", func() {
		result, err := detect(packit.DetectContext{
			WorkingDir: workingDir,
		})
		Expect(err).NotTo(HaveOccurred())
		Expect(result).To(Equal(packit.DetectResult{
			Plan: packit.BuildPlan{
				Provides: []packit.BuildPlanProvision{
					{Name: "yarn"},
				},
			},
		}))
	})
}