Merge pull request #58941 from vikaschoudhary16/test-allocate

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Add unit test for endpoint allocate

**What this PR does / why we need it**:
Adds a unit test for covering `allocate` function at endpoint.


**Release note**:

```release-note
None
```

/kind testing
/area hw-accelerators
/cc @jiayingz @vishh @derekwaynecarr @RenaudWasTaken @resouer @ConnorDoyle

pkg/kubelet/cm/devicemanager/endpoint_test.go

@@ -19,6 +19,7 @@ package devicemanager
 import (
 	"path"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 
@@ -111,6 +112,56 @@ func TestRun(t *testing.T) {
 
 }
 
+func TestAllocate(t *testing.T) {
+	socket := path.Join("/tmp", esocketName)
+	devs := []*pluginapi.Device{
+		{ID: "ADeviceId", Health: pluginapi.Healthy},
+	}
+	callbackCount := 0
+	callbackChan := make(chan int)
+	p, e := esetup(t, devs, socket, "mock", func(n string, a, u, r []pluginapi.Device) {
+		callbackCount++
+		callbackChan <- callbackCount
+	})
+	defer ecleanup(t, p, e)
+
+	resp := new(pluginapi.AllocateResponse)
+	resp.Devices = append(resp.Devices, &pluginapi.DeviceSpec{
+		ContainerPath: "/dev/aaa",
+		HostPath:      "/dev/aaa",
+		Permissions:   "mrw",
+	})
+
+	resp.Devices = append(resp.Devices, &pluginapi.DeviceSpec{
+		ContainerPath: "/dev/bbb",
+		HostPath:      "/dev/bbb",
+		Permissions:   "mrw",
+	})
+
+	resp.Mounts = append(resp.Mounts, &pluginapi.Mount{
+		ContainerPath: "/container_dir1/file1",
+		HostPath:      "host_dir1/file1",
+		ReadOnly:      true,
+	})
+
+	p.SetAllocFunc(func(r *pluginapi.AllocateRequest, devs map[string]pluginapi.Device) (*pluginapi.AllocateResponse, error) {
+		return resp, nil
+	})
+
+	go e.run()
+	// Wait for the callback to be issued.
+	select {
+	case <-callbackChan:
+		break
+	case <-time.After(time.Second):
+		t.FailNow()
+	}
+
+	respOut, err := e.allocate([]string{"ADeviceId"})
+	require.NoError(t, err)
+	require.Equal(t, resp, respOut)
+}
+
 func TestGetDevices(t *testing.T) {
 	e := endpointImpl{
 		devices: map[string]pluginapi.Device{