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/common_function_test.go

@@ -0,0 +1,150 @@
+package utils_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"reflect"
+	"strings"
+
+	. "github.com/containers/libpod/test/utils"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Common functions test", func() {
+	var defaultOSPath string
+	var defaultCgroupPath string
+
+	BeforeEach(func() {
+		defaultOSPath = OSReleasePath
+		defaultCgroupPath = ProcessOneCgroupPath
+	})
+
+	AfterEach(func() {
+		OSReleasePath = defaultOSPath
+		ProcessOneCgroupPath = defaultCgroupPath
+	})
+
+	It("Test CreateTempDirInTempDir", func() {
+		tmpDir, _ := CreateTempDirInTempDir()
+		_, err := os.Stat(tmpDir)
+		Expect(os.IsNotExist(err)).ShouldNot(BeTrue(), "Directory is not created as expect")
+	})
+
+	It("Test SystemExec", func() {
+		session := SystemExec(GoechoPath, []string{})
+		Expect(session.Command.Process).ShouldNot(BeNil(), "SystemExec can not start a process")
+	})
+
+	It("Test StringInSlice", func() {
+		testSlice := []string{"apple", "peach", "pear"}
+		Expect(StringInSlice("apple", testSlice)).To(BeTrue(), "apple should in ['apple', 'peach', 'pear']")
+		Expect(StringInSlice("banana", testSlice)).ShouldNot(BeTrue(), "banana should not in ['apple', 'peach', 'pear']")
+		Expect(StringInSlice("anything", []string{})).ShouldNot(BeTrue(), "anything should not in empty slice")
+	})
+
+	DescribeTable("Test GetHostDistributionInfo",
+		func(path, id, ver string, empty bool) {
+			txt := fmt.Sprintf("ID=%s\nVERSION_ID=%s", id, ver)
+			if !empty {
+				f, _ := os.Create(path)
+				f.WriteString(txt)
+				f.Close()
+			}
+
+			OSReleasePath = path
+			host := GetHostDistributionInfo()
+			if empty {
+				Expect(host).To(Equal(HostOS{}), "HostOs should be empty.")
+			} else {
+				Expect(host.Distribution).To(Equal(strings.Trim(id, "\"")))
+				Expect(host.Version).To(Equal(strings.Trim(ver, "\"")))
+			}
+		},
+		Entry("Configure file is not exist.", "/tmp/notexist", "", "", true),
+		Entry("Item value with and without \"", "/tmp/os-release.test", "fedora", "\"28\"", false),
+		Entry("Item empty with and without \"", "/tmp/os-release.test", "", "\"\"", false),
+	)
+
+	DescribeTable("Test IsKernelNewerThan",
+		func(kv string, expect, isNil bool) {
+			newer, err := IsKernelNewerThan(kv)
+			Expect(newer).To(Equal(expect), "Version compare results is not as expect.")
+			Expect(err == nil).To(Equal(isNil), "Error is not as expect.")
+		},
+		Entry("Invlid kernel version: 0", "0", false, false),
+		Entry("Older kernel version:0.0", "0.0", true, true),
+		Entry("Newer kernel version: 100.17.14", "100.17.14", false, true),
+		Entry("Invlid kernel version: I am not a kernel version", "I am not a kernel version", false, false),
+	)
+
+	DescribeTable("Test TestIsCommandAvailable",
+		func(cmd string, expect bool) {
+			cmdExist := IsCommandAvailable(cmd)
+			Expect(cmdExist).To(Equal(expect))
+		},
+		Entry("Command exist", GoechoPath, true),
+		Entry("Command exist", "Fakecmd", false),
+	)
+
+	It("Test WriteJsonFile", func() {
+		type testJson struct {
+			Item1 int
+			Item2 []string
+		}
+		compareData := &testJson{}
+
+		testData := &testJson{
+			Item1: 5,
+			Item2: []string{"test"},
+		}
+
+		testByte, _ := json.Marshal(testData)
+		err := WriteJsonFile(testByte, "/tmp/testJson")
+
+		Expect(err).To(BeNil(), "Failed to write JSON to file.")
+
+		read, err := os.Open("/tmp/testJson")
+		defer read.Close()
+
+		Expect(err).To(BeNil(), "Can not find the JSON file after we write it.")
+
+		bytes, _ := ioutil.ReadAll(read)
+		json.Unmarshal(bytes, compareData)
+
+		Expect(reflect.DeepEqual(testData, compareData)).To(BeTrue(), "Data chaned after we store it to file.")
+	})
+
+	DescribeTable("Test Containerized",
+		func(path string, setEnv, createFile, expect bool) {
+			if setEnv && (os.Getenv("container") == "") {
+				os.Setenv("container", "test")
+				defer os.Setenv("container", "")
+			}
+			if !setEnv && (os.Getenv("container") != "") {
+				containerized := os.Getenv("container")
+				os.Setenv("container", "")
+				defer os.Setenv("container", containerized)
+			}
+			txt := "1:test:/"
+			if expect {
+				txt = "2:docker:/"
+			}
+			if createFile {
+				f, _ := os.Create(path)
+				f.WriteString(txt)
+				f.Close()
+			}
+			ProcessOneCgroupPath = path
+			Expect(Containerized()).To(Equal(expect))
+		},
+		Entry("Set container in env", "", true, false, true),
+		Entry("Can not read from file", "/tmp/notexist", false, false, false),
+		Entry("Docker in cgroup file", "/tmp/cgroup.test", false, true, true),
+		Entry("Docker not in cgroup file", "/tmp/cgroup.test", false, true, false),
+	)
+
+})