Separate common used test functions and structs to test/utils

Put common used test functions and structs to a separated package.
So we can use them for more testsuites.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>

test/utils/utils_suite_test.go

@@ -0,0 +1,52 @@
+package utils_test
+
+import (
+	"fmt"
+	"io"
+	"os/exec"
+	"strings"
+	"testing"
+
+	. "github.com/containers/libpod/test/utils"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/onsi/gomega/gexec"
+)
+
+var FakeOutputs map[string][]string
+var GoechoPath = "../goecho/goecho"
+
+type FakePodmanTest struct {
+	PodmanTest
+}
+
+func FakePodmanTestCreate() *FakePodmanTest {
+	FakeOutputs = make(map[string][]string)
+	p := &FakePodmanTest{
+		PodmanTest: PodmanTest{
+			PodmanBinary: GoechoPath,
+		},
+	}
+
+	p.PodmanMakeOptions = p.makeOptions
+	return p
+}
+
+func (p *FakePodmanTest) makeOptions(args []string) []string {
+	return FakeOutputs[strings.Join(args, " ")]
+}
+
+func StartFakeCmdSession(args []string) *PodmanSession {
+	var outWriter, errWriter io.Writer
+	command := exec.Command(GoechoPath, args...)
+	session, err := gexec.Start(command, outWriter, errWriter)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return &PodmanSession{session}
+}
+
+func TestUtils(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Unit test for test utils package")
+}