diff --git a/codersdk/workspaces_test.go b/codersdk/workspaces_test.go
index ee03c88643..63cb99e062 100644
--- a/codersdk/workspaces_test.go
+++ b/codersdk/workspaces_test.go
@@ -13,8 +13,10 @@ import (
 	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"golang.org/x/xerrors"
 
 	"github.com/coder/coder/v2/codersdk"
+	"github.com/coder/coder/v2/testutil"
 )
 
 func TestResolveWorkspace(t *testing.T) {
@@ -271,13 +273,13 @@ func TestResolveWorkspace(t *testing.T) {
 	t.Run("TransportError", func(t *testing.T) {
 		t.Parallel()
 
-		// Close the server immediately so the transport layer fails.
-		srv := httptest.NewServer(http.NotFoundHandler())
-		srvURL, err := url.Parse(srv.URL)
+		baseURL, err := url.Parse("http://example.com")
 		require.NoError(t, err)
-		srv.Close()
-
-		client := codersdk.New(srvURL)
+		client := codersdk.New(baseURL, codersdk.WithHTTPClient(&http.Client{
+			Transport: testutil.RoundTripperFunc(func(*http.Request) (*http.Response, error) {
+				return nil, xerrors.New("transport error")
+			}),
+		}))
 
 		_, err = client.ResolveWorkspace(t.Context(), uuid.NewString())
 		require.Error(t, err)
diff --git a/testutil/http.go b/testutil/http.go
index 653c8f642c..0a764b46a9 100644
--- a/testutil/http.go
+++ b/testutil/http.go
@@ -9,6 +9,15 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// RoundTripperFunc adapts a function to an http.RoundTripper.
+type RoundTripperFunc func(*http.Request) (*http.Response, error)
+
+var _ http.RoundTripper = RoundTripperFunc(nil)
+
+func (f RoundTripperFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req)
+}
+
 // RequireEventuallyResponseOK makes HTTP GET requests to the given endpoint until it returns
 // 200 OK with a valid JSON response that can be decoded into target, or until the context
 // times out. This is useful for waiting for HTTP servers to become ready during tests,