Mock the docker call when calling it from tests

cmd/minikube/cmd/delete_test.go

@@ -194,6 +194,9 @@ func TestDeleteAllProfiles(t *testing.T) {
 		t.Errorf("got %d test machines, expected %d: %s", len(mFiles), numberOfTotalMachineDirs, mFiles)
 	}
 
+	config.DockerContainers = func() ([]string, error) {
+		return []string{}, nil
+	}
 	validProfiles, inValidProfiles, err := config.ListProfiles()
 	if err != nil {
 		t.Error(err)

pkg/minikube/config/profile.go

@@ -192,6 +192,11 @@ func DeleteProfile(profile string, miniHome ...string) error {
 	return os.RemoveAll(ProfileFolderPath(profile, miniPath))
 }
 
+// DockerContainers lists all containers created by docker driver
+var DockerContainers = func() ([]string, error) {
+	return oci.ListOwnedContainers(oci.Docker)
+}
+
 // ListProfiles returns all valid and invalid (if any) minikube profiles
 // invalidPs are the profiles that have a directory or config file but not usable
 // invalidPs would be suggested to be deleted
@@ -203,7 +208,7 @@ func ListProfiles(miniHome ...string) (validPs []*Profile, inValidPs []*Profile,
 		return nil, nil, err
 	}
 	// try to get profiles list based on all containers created by docker driver
-	cs, err := oci.ListOwnedContainers(oci.Docker)
+	cs, err := DockerContainers()
 	if err == nil {
 		pDirs = append(pDirs, cs...)
 	}

pkg/minikube/config/profile_test.go

@@ -52,8 +52,16 @@ func TestListProfiles(t *testing.T) {
 		{2, "p5_partial_config", ""},
 	}
 
+	DockerContainers = func() ([]string, error) {
+		return []string{}, nil
+	}
 	val, inv, err := ListProfiles(miniDir)
 
+	num := len(testCasesValidProfs) + len(testCasesInValidProfs)
+	if num != len(val)+len(inv) {
+		t.Errorf("ListProfiles length = %d, expected %d\nvalid: %v\ninvalid: %v\n", len(val)+len(inv), num, val, inv)
+	}
+
 	for _, tt := range testCasesValidProfs {
 		if val[tt.index].Name != tt.expectName {
 			t.Errorf("expected %s got %v", tt.expectName, val[tt.index].Name)