test: [M3-8550] - Add unit tests for EntityHeader component (#11222)

* test: [M3-8550] - Add unit tests for EntityHeader component

* Added changeset: unit test cases for EntityHeader component

packages/manager/.changeset/pr-11222-added-1730959236426.md

@@ -0,0 +1,5 @@
+---
+"@linode/manager": Added
+---
+
+unit test cases for EntityHeader component ([#11222](https://github.com/linode/manager/pull/11222))

packages/manager/src/components/EntityHeader/EntityHeader.test.tsx

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+import React from 'react';
+
+import { renderWithTheme } from 'src/utilities/testHelpers';
+
+import { EntityHeader } from './EntityHeader';
+
+import { HeaderProps } from './EntityHeader';
+
+const mockText = 'Hello world';
+
+const defaultProps: HeaderProps = {
+  title: mockText,
+};
+
+describe('EntityHeader', () => {
+  it('should render title with variant when isSummaryView is True', () => {
+    const { getByRole } = renderWithTheme(
+      <EntityHeader variant="h2" isSummaryView {...defaultProps} />
+    );
+    const heading = getByRole('heading', { level: 2 });
+    expect(heading).toBeInTheDocument();
+    expect(heading).toHaveTextContent(mockText);
+  });
+
+  it('should not render title when isSummaryView is False', () => {
+    const { queryByText } = renderWithTheme(
+      <EntityHeader isSummaryView={false} {...defaultProps} />
+    );
+    expect(queryByText(mockText)).not.toBeInTheDocument();
+  });
+
+  it('should render children if provided', () => {
+    const { getByText } = renderWithTheme(
+      <EntityHeader {...defaultProps}>
+        <div>Child items can go here!</div>
+      </EntityHeader>
+    );
+    expect(getByText('Child items can go here!')).toBeInTheDocument();
+  });
+});