implement check command

cmd/check/check.go

@@ -1,7 +1,34 @@
 package main
 
-import "fmt"
+import (
+	"encoding/json"
+	"os"
+
+	"github.com/concourse/github-release-resource"
+)
 
 func main() {
-	fmt.Println("[]")
+	var request resource.CheckRequest
+	inputRequest(&request)
+
+	github := resource.NewGitHubClient(request.Source)
+	command := resource.NewCheckCommand(github)
+	response, err := command.Run(request)
+	if err != nil {
+		resource.Fatal("running command", err)
+	}
+
+	outputResponse(response)
+}
+
+func inputRequest(request *resource.CheckRequest) {
+	if err := json.NewDecoder(os.Stdin).Decode(request); err != nil {
+		resource.Fatal("reading request from stdin", err)
+	}
+}
+
+func outputResponse(response []resource.Version) {
+	if err := json.NewEncoder(os.Stdout).Encode(response); err != nil {
+		resource.Fatal("writing response to stdout", err)
+	}
 }

cmd/check/check_suite_test.go

@@ -1,27 +0,0 @@
-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

@@ -1,23 +0,0 @@
-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))
-	})
-})