gexec/exit_matcher_test.go

package gexec_test

import (
	. "github.com/onsi/gomega/gexec"
	"os/exec"
	"time"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

type NeverExits struct{}

func (e NeverExits) ExitCode() int {
	return -1
}

var _ = Describe("ExitMatcher", func() {
	var command *exec.Cmd
	var session *Session

	BeforeEach(func() {
		var err error
		command = exec.Command(fireflyPath, "0")
		session, err = Start(command, nil, nil)
		Ω(err).ShouldNot(HaveOccurred())
	})

	Describe("when passed something that is an Exiter", func() {
		It("should act normally", func() {
			failures := InterceptGomegaFailures(func() {
				Ω(NeverExits{}).Should(Exit())
			})

			Ω(failures[0]).Should(ContainSubstring("Expected process to exit.  It did not."))
		})
	})

	Describe("when passed something that is not an Exiter", func() {
		It("should error", func() {
			failures := InterceptGomegaFailures(func() {
				Ω("aardvark").Should(Exit())
			})

			Ω(failures[0]).Should(ContainSubstring("Exit must be passed a gexec.Exiter"))
		})
	})

	Context("with no exit code", func() {
		It("should say the right things when it fails", func() {
			Ω(session).ShouldNot(Exit())

			failures := InterceptGomegaFailures(func() {
				Ω(session).Should(Exit())
			})

			Ω(failures[0]).Should(ContainSubstring("Expected process to exit.  It did not."))

			Eventually(session).Should(Exit())

			Ω(session).Should(Exit())

			failures = InterceptGomegaFailures(func() {
				Ω(session).ShouldNot(Exit())
			})

			Ω(failures[0]).Should(ContainSubstring("Expected process not to exit.  It did."))
		})
	})

	Context("with an exit code", func() {
		It("should say the right things when it fails", func() {
			Ω(session).ShouldNot(Exit(0))
			Ω(session).ShouldNot(Exit(1))

			failures := InterceptGomegaFailures(func() {
				Ω(session).Should(Exit(0))
			})

			Ω(failures[0]).Should(ContainSubstring("Expected process to exit.  It did not."))

			Eventually(session).Should(Exit(0))

			Ω(session).Should(Exit(0))

			failures = InterceptGomegaFailures(func() {
				Ω(session).Should(Exit(1))
			})

			Ω(failures[0]).Should(ContainSubstring("to match exit code:"))

			Ω(session).ShouldNot(Exit(1))

			failures = InterceptGomegaFailures(func() {
				Ω(session).ShouldNot(Exit(0))
			})

			Ω(failures[0]).Should(ContainSubstring("not to match exit code:"))
		})
	})

	Describe("bailing out early", func() {
		It("should bail out early once the process exits", func() {
			t := time.Now()

			failures := InterceptGomegaFailures(func() {
				Eventually(session).Should(Exit(1))
			})
			Ω(time.Since(t)).Should(BeNumerically("<=", 500*time.Millisecond))
			Ω(failures).Should(HaveLen(1))
		})
	})
})