Simplify and standardize testing structure

tests/components/Header.test.tsx

@@ -0,0 +1,22 @@
+import React from "react";
+import Header from "../../app/components/Header";
+import { componentTestSuite } from "../utils/componentTestSuite";
+
+type HeaderProps = React.ComponentProps<typeof Header>;
+
+componentTestSuite<HeaderProps>({
+  component: Header,
+  name: "Header",
+  // Header has no props; it reads from routing and config.
+  props: {} as HeaderProps,
+  requiredProps: [],
+  primaryRole: "banner",
+  testCases: {
+    renders: true,
+    accessibility: true,
+    keyboardNavigation: false,
+    disabledState: false,
+    errorState: false,
+  },
+});
+