@@ -30,7 +30,7 @@ func ensureHTTPServerImage(t testingT) {

 	}

 	defer os.RemoveAll(tmp)

-	goos := testEnv.DaemonInfo.OSType

+	goos := testEnv.OSType

 	if goos == "" {

 		goos = "linux"

 	}

@@ -115,7 +115,7 @@ func Docker(cmd icmd.Cmd, cmdOperators ...CmdOperator) *icmd.Result {

 // validateArgs is a checker to ensure tests are not running commands which are

 // not supported on platforms. Specifically on Windows this is 'busybox top'.

 func validateArgs(args ...string) error {

-	if testEnv.DaemonInfo.OSType != "windows" {

+	if testEnv.OSType != "windows" {

 		return nil

 	}

 	foundBusybox := -1

@@ -67,9 +67,9 @@ func (e *Execution) ExperimentalDaemon() bool {

 // decisions on how to configure themselves according to the platform

 // of the daemon. This is initialized in docker_utils by sending

 // a version call to the daemon and examining the response header.

-// Deprecated: use Execution.DaemonInfo.OSType

+// Deprecated: use Execution.OSType

 func (e *Execution) DaemonPlatform() string {

-	return e.DaemonInfo.OSType

+	return e.OSType

 }

 // MinimalBaseImage is the image used for minimal builds (it depends on the platform)

@@ -21,12 +21,12 @@ func ArchitectureIsNot(arch string) bool {

 }

 func DaemonIsWindows() bool {

-	return testEnv.DaemonInfo.OSType == "windows"

+	return testEnv.OSType == "windows"

 }

 func DaemonIsWindowsAtLeastBuild(buildNumber int) func() bool {

 	return func() bool {

-		if testEnv.DaemonInfo.OSType != "windows" {

+		if testEnv.OSType != "windows" {

 			return false

 		}

 		version := testEnv.DaemonInfo.KernelVersion

@@ -36,7 +36,7 @@ func DaemonIsWindowsAtLeastBuild(buildNumber int) func() bool {

 }

 func DaemonIsLinux() bool {

-	return testEnv.DaemonInfo.OSType == "linux"

+	return testEnv.OSType == "linux"

 }

 func OnlyDefaultNetworks() bool {

@@ -178,21 +178,21 @@ func UserNamespaceInKernel() bool {

 }

 func IsPausable() bool {

-	if testEnv.DaemonInfo.OSType == "windows" {

+	if testEnv.OSType == "windows" {

 		return testEnv.DaemonInfo.Isolation == "hyperv"

 	}

 	return true

 }

 func NotPausable() bool {

-	if testEnv.DaemonInfo.OSType == "windows" {

+	if testEnv.OSType == "windows" {

 		return testEnv.DaemonInfo.Isolation == "process"

 	}

 	return false

 }

 func IsolationIs(expectedIsolation string) bool {

-	return testEnv.DaemonInfo.OSType == "windows" && string(testEnv.DaemonInfo.Isolation) == expectedIsolation

+	return testEnv.OSType == "windows" && string(testEnv.DaemonInfo.Isolation) == expectedIsolation

 }

 func IsolationIsHyperv() bool {

@@ -20,5 +20,5 @@ func TestVersion(t *testing.T) {

 	assert.NotNil(t, version.Version)

 	assert.NotNil(t, version.MinAPIVersion)

 	assert.Equal(t, testEnv.DaemonInfo.ExperimentalBuild, version.Experimental)

-	assert.Equal(t, testEnv.DaemonInfo.OSType, version.Os)

+	assert.Equal(t, testEnv.OSType, version.Os)

 }

@@ -28,7 +28,7 @@ type logT interface {

 func (e *Execution) Clean(t testingT) {

 	client := e.APIClient()

-	platform := e.DaemonInfo.OSType

+	platform := e.OSType

 	if (platform != "windows") || (platform == "windows" && e.DaemonInfo.Isolation == "hyperv") {

 		unpauseAllContainers(t, client)

 	}

@@ -17,6 +17,7 @@ import (

 type Execution struct {

 	client            client.APIClient

 	DaemonInfo        types.Info

+	OSType            string

 	PlatformDefaults  PlatformDefaults

 	protectedElements protectedElements

 }

@@ -40,19 +41,31 @@ func New() (*Execution, error) {

 		return nil, errors.Wrapf(err, "failed to get info from daemon")

 	}

+	osType := getOSType(info)

+

 	return &Execution{

 		client:            client,

 		DaemonInfo:        info,

-		PlatformDefaults:  getPlatformDefaults(info),

+		OSType:            osType,

+		PlatformDefaults:  getPlatformDefaults(info, osType),

 		protectedElements: newProtectedElements(),

 	}, nil

 }

-func getPlatformDefaults(info types.Info) PlatformDefaults {

+func getOSType(info types.Info) string {

+	// Docker EE does not set the OSType so allow the user to override this value.

+	userOsType := os.Getenv("TEST_OSTYPE")

+	if userOsType != "" {

+		return userOsType

+	}

+	return info.OSType

+}

+

+func getPlatformDefaults(info types.Info, osType string) PlatformDefaults {

 	volumesPath := filepath.Join(info.DockerRootDir, "volumes")

 	containersPath := filepath.Join(info.DockerRootDir, "containers")

-	switch info.OSType {

+	switch osType {

 	case "linux":

 		return PlatformDefaults{

 			BaseImage:            "scratch",

@@ -71,7 +84,7 @@ func getPlatformDefaults(info types.Info) PlatformDefaults {

 			ContainerStoragePath: filepath.FromSlash(containersPath),

 		}

 	default:

-		panic(fmt.Sprintf("unknown info.OSType for daemon: %s", info.OSType))

+		panic(fmt.Sprintf("unknown OSType for daemon: %s", osType))

 	}

 }

@@ -35,7 +35,7 @@ func ProtectAll(t testingT, testEnv *Execution) {

 	ProtectImages(t, testEnv)

 	ProtectNetworks(t, testEnv)

 	ProtectVolumes(t, testEnv)

-	if testEnv.DaemonInfo.OSType == "linux" {

+	if testEnv.OSType == "linux" {

 		ProtectPlugins(t, testEnv)

 	}

 }

@@ -81,7 +81,7 @@ func (e *Execution) ProtectImage(t testingT, images ...string) {

 func ProtectImages(t testingT, testEnv *Execution) {

 	images := getExistingImages(t, testEnv)

-	if testEnv.DaemonInfo.OSType == "linux" {

+	if testEnv.OSType == "linux" {

 		images = append(images, ensureFrozenImagesLinux(t, testEnv)...)

 	}

 	testEnv.ProtectImage(t, images...)