fixed tests -- workaround for missing matchMedia function

Author: srclosson

src/test/setupTests.ts

@@ -1 +1,15 @@
 import '@testing-library/jest-dom';
+
+Object.defineProperty(global, 'matchMedia', {
+    writable: true,
+    value: jest.fn().mockImplementation((query) => ({
+      matches: false,
+      media: query,
+      onchange: null,
+      addListener: jest.fn(), // deprecated
+      removeListener: jest.fn(), // deprecated
+      addEventListener: jest.fn(),
+      removeEventListener: jest.fn(),
+      dispatchEvent: jest.fn(),
+    })),
+  });