client: update error-assertions in tests

- use is.ErrorType
- replace uses of client.IsErrNotFound for errdefs.IsNotFound, as
  the client no longer returns the old error-type.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

1 files changed, 4 insertions, 6 deletions

diff --git a/client/task_inspect_test.go b/client/task_inspect_test.go
index f8ed67cf19..01e5deca64 100644
--- a/client/task_inspect_test.go
+++ b/client/task_inspect_test.go
@@ -13,6 +13,8 @@ import (
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/errdefs"
 	"github.com/pkg/errors"
+	"gotest.tools/v3/assert"
+	is "gotest.tools/v3/assert/cmp"
 )
 
 func TestTaskInspectError(t *testing.T) {
@@ -21,9 +23,7 @@ func TestTaskInspectError(t *testing.T) {
 	}
 
 	_, _, err := client.TaskInspectWithRaw(context.Background(), "nothing")
-	if !errdefs.IsSystem(err) {
-		t.Fatalf("expected a Server Error, got %[1]T: %[1]v", err)
-	}
+	assert.Check(t, is.ErrorType(err, errdefs.IsSystem))
 }
 
 func TestTaskInspectWithEmptyID(t *testing.T) {
@@ -33,9 +33,7 @@ func TestTaskInspectWithEmptyID(t *testing.T) {
 		}),
 	}
 	_, _, err := client.TaskInspectWithRaw(context.Background(), "")
-	if !IsErrNotFound(err) {
-		t.Fatalf("Expected NotFoundError, got %v", err)
-	}
+	assert.Check(t, is.ErrorType(err, errdefs.IsNotFound))
 }
 
 func TestTaskInspect(t *testing.T) {