API: Fix storing dashboard with static UID (#43861)

* API: Fix storing dashboard with static UID

pkg/tests/api/dashboards/api_dashboards_test.go

@@ -97,7 +97,7 @@ func createUser(t *testing.T, store *sqlstore.SQLStore, cmd models.CreateUserCom
 	return u.Id
 }
 
-func TestProvisionioningDashboards(t *testing.T) {
+func TestUpdatingProvisionionedDashboards(t *testing.T) {
 	// Setup Grafana and its Database
 	dir, path := testinfra.CreateGrafDir(t, testinfra.GrafanaOpts{
 		DisableAnonymous: true,
@@ -161,14 +161,31 @@ providers:
 		testCases := []struct {
 			desc          string
 			dashboardData string
+			expStatus     int
+			expErrReason  string
 		}{
 			{
 				desc:          "when updating provisioned dashboard using ID it should fail",
 				dashboardData: fmt.Sprintf(`{"title":"just testing", "id": %d, "version": 1}`, dashboardID),
+				expStatus:     http.StatusBadRequest,
+				expErrReason:  models.ErrDashboardCannotSaveProvisionedDashboard.Reason,
 			},
 			{
-				desc:          "when updating provisioned dashboard using UID is should fail",
+				desc:          "when updating provisioned dashboard using UID it should fail",
 				dashboardData: fmt.Sprintf(`{"title":"just testing", "uid": %q, "version": 1}`, dashboardUID),
+				expStatus:     http.StatusBadRequest,
+				expErrReason:  models.ErrDashboardCannotSaveProvisionedDashboard.Reason,
+			},
+			{
+				desc:          "when updating dashboard using unknown ID, it should fail",
+				dashboardData: `{"title":"just testing", "id": 42, "version": 1}`,
+				expStatus:     http.StatusNotFound,
+				expErrReason:  models.ErrDashboardNotFound.Reason,
+			},
+			{
+				desc:          "when updating dashboard using unknown UID, it should succeed",
+				dashboardData: `{"title":"just testing", "uid": "unknown", "version": 1}`,
+				expStatus:     http.StatusOK,
 			},
 		}
 		for _, tc := range testCases {
@@ -186,17 +203,20 @@ providers:
 				// nolint:gosec
 				resp, err := http.Post(u, "application/json", buf)
 				require.NoError(t, err)
-				assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+				assert.Equal(t, tc.expStatus, resp.StatusCode)
 				t.Cleanup(func() {
 					err := resp.Body.Close()
 					require.NoError(t, err)
 				})
+				if tc.expErrReason == "" {
+					return
+				}
 				b, err := ioutil.ReadAll(resp.Body)
 				require.NoError(t, err)
 				dashboardErr := &errorResponseBody{}
 				err = json.Unmarshal(b, dashboardErr)
 				require.NoError(t, err)
-				assert.Equal(t, models.ErrDashboardCannotSaveProvisionedDashboard.Reason, dashboardErr.Message)
+				assert.Equal(t, tc.expErrReason, dashboardErr.Message)
 			})
 		}