Migrate diff, exec, export, and history to ginkgo

Migrate the diff, exec, export, and history bats tests to
the ginkgo test suite.

Signed-off-by: baude <bbaude@redhat.com>

Closes: #287
Approved by: baude

test/e2e/export_test.go

@@ -0,0 +1,46 @@
+package integration
+
+import (
+	"os"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"path/filepath"
+)
+
+var _ = Describe("Podman export", func() {
+	var (
+		tempdir    string
+		err        error
+		podmanTest PodmanTest
+	)
+
+	BeforeEach(func() {
+		tempdir, err = CreateTempDirInTempDir()
+		if err != nil {
+			os.Exit(1)
+		}
+		podmanTest = PodmanCreate(tempdir)
+		podmanTest.RestoreAllArtifacts()
+	})
+
+	AfterEach(func() {
+		podmanTest.Cleanup()
+
+	})
+
+	It("podman export output flag", func() {
+		_, ec, cid := podmanTest.RunLsContainer("")
+		Expect(ec).To(Equal(0))
+
+		outfile := filepath.Join(podmanTest.TempDir, "container.tar")
+		result := podmanTest.Podman([]string{"export", "-o", outfile, cid})
+		result.WaitWithDefaultTimeout()
+		Expect(result.ExitCode()).To(Equal(0))
+		_, err := os.Stat(outfile)
+		Expect(err).To(BeNil())
+
+		err = os.Remove(outfile)
+		Expect(err).To(BeNil())
+	})
+})