implement empty check

README.md

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+# GitHub Releases Resource

cmd/check/check.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("[]")
+}

cmd/check/check_suite_test.go

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+package main_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/onsi/gomega/gexec"
+)
+
+var checkPath string
+
+func TestCheck(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Check Suite")
+}
+
+var _ = BeforeSuite(func() {
+	var err error
+	checkPath, err = gexec.Build("github.com/concourse/github-release-resource/cmd/check")
+	Ω(err).ShouldNot(HaveOccurred())
+})
+
+var _ = AfterSuite(func() {
+	gexec.CleanupBuildArtifacts()
+})

cmd/check/check_test.go

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+package main_test
+
+import (
+	"os/exec"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/onsi/gomega/gbytes"
+	"github.com/onsi/gomega/gexec"
+)
+
+var _ = Describe("Check", func() {
+	It("outputs an empty JSON array", func() {
+		command := exec.Command(checkPath)
+
+		check, err := gexec.Start(command, GinkgoWriter, GinkgoWriter)
+		Ω(err).ShouldNot(HaveOccurred())
+
+		Eventually(check).Should(gbytes.Say(`\[\]`))
+		Eventually(check).Should(gexec.Exit(0))
+	})
+})