diff --git a/libs/designsystem/testing-base/src/lib/components/mock.chart.component.ts b/libs/designsystem/testing-base/src/lib/components/mock.chart.component.ts
index 7c11df824e..97f7eb3735 100644
--- a/libs/designsystem/testing-base/src/lib/components/mock.chart.component.ts
+++ b/libs/designsystem/testing-base/src/lib/components/mock.chart.component.ts
@@ -2,6 +2,10 @@ import { Component, forwardRef, Input } from '@angular/core';
 
 import { ChartComponent, ChartType } from '@kirbydesign/designsystem';
 
+// IMPORTANT: MockChartComponent class needs to extend MockBaseChartComponent
+// see https://github.com/kirbydesign/designsystem/issues/3029
+import { MockBaseChartComponent } from './mock.base-chart.component';
+
 // #region AUTO-GENERATED - PLEASE DON'T EDIT CONTENT WITHIN!
 @Component({
   selector: 'kirby-chart',
@@ -13,7 +17,7 @@ import { ChartComponent, ChartType } from '@kirbydesign/designsystem';
     },
   ],
 })
-export class MockChartComponent {
+export class MockChartComponent extends MockBaseChartComponent {
   @Input() type: Exclude<ChartType, 'stock'>;
 }
 
diff --git a/libs/designsystem/testing-base/src/lib/components/mock.stock-chart.component.ts b/libs/designsystem/testing-base/src/lib/components/mock.stock-chart.component.ts
index dbc214c485..288858103e 100644
--- a/libs/designsystem/testing-base/src/lib/components/mock.stock-chart.component.ts
+++ b/libs/designsystem/testing-base/src/lib/components/mock.stock-chart.component.ts
@@ -3,6 +3,10 @@ import { Component, forwardRef, Input } from '@angular/core';
 import { StockChartComponent } from '@kirbydesign/designsystem';
 import { ChartDataLabelOptions } from '@kirbydesign/designsystem/chart';
 
+// IMPORTANT: MockStockChartComponent class needs to extend MockBaseChartComponent
+// see https://github.com/kirbydesign/designsystem/issues/3029
+import { MockBaseChartComponent } from './mock.base-chart.component';
+
 // #region AUTO-GENERATED - PLEASE DON'T EDIT CONTENT WITHIN!
 @Component({
   selector: 'kirby-stock-chart',
@@ -14,7 +18,7 @@ import { ChartDataLabelOptions } from '@kirbydesign/designsystem/chart';
     },
   ],
 })
-export class MockStockChartComponent {
+export class MockStockChartComponent extends MockBaseChartComponent {
   @Input() dataLabelOptions?: ChartDataLabelOptions;
 }