Add unit tests for captureSavedViewData and createViewState

[Copilot]

Added comprehensive test coverage for captureSavedViewData and createViewState functions in saved-views-react, following patterns from itwin-saved-views-utilities repository.

Changes

Test Files Created:

• captureSavedViewData.test.ts - 17 tests covering 3D/2D/Sheet view capture, extension handlers, angle conversion, and edge cases
• createViewState.test.ts - 24 tests covering view state creation from different data types, visibility settings, and API variants
• testUtilities.ts - Reusable mocks for IModelConnection, ViewState, and Viewport

Test Coverage:

• captureSavedViewData.ts: 87.3% statements, 66.23% branches
• createViewState.ts: 83.62% statements, 64.15% branches
• All 41 tests passing

Key Test Scenarios:

• View data extraction from spatial, drawing, and sheet views
• Extension handler behavior (emphasis elements, per-model category visibility)
• Model and category visibility settings application
• ViewState creation with various configuration options
• Blank iModel and empty default view handling

Tests validate the extraction functions (extractViewDetails3d, extractViewDetails2d) that share similar implementation with itwin-saved-views-utilities.

Example test structure:

it("should capture spatial view data correctly", async () => {
  const iModel = createMockIModelConnection();
  const viewState = createMockSpatialViewState();
  const viewport = createMockViewport(viewState, iModel);

  const result = await captureSavedViewData({ viewport });

  expect(result.viewData.type).toBe("iTwin3d");
  expect(result.viewData.origin).toEqual([0, 0, 0]);
  expect(result.viewData.categories?.enabled).toContain("0x10");
});

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create tests for saved-views-react</issue_title>
<issue_description>Need to create react component tests for saved-views-react. Make sure to test the captureSavedViewData and the createViewState. Those tests may be similar to the tests found in the itwin-saved-views-utilities repo, in the src/tests folder, as the extractViewDetails3d functions in saved-views-react and itwin-saved-views-utilities are very similar. The extractViewDetails2d and extractViewDetails functions in those respective repos are also very similar.

Also analyze the test coverage for these newly created tests. Show the test coverage.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create tests for saved-views-react #167

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