Office Addin Mock does not support basic API usage of `.items` to get array of PowerPoint.Slide

Prerequisites

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• I checked to make sure that this issue has not already been filed

• I checked the documentation and found no answer

Expected behavior

I should be able to access an array PowerPoint.Slide by accessing PowerPoint.SlideCollection.items field. This works just fine outside of the tests.

example:

context.presentation.load("slides/id") 
await context.sync()
context.presentation.slides.items // an array of PowerPoint.Slide

Current behavior

The current behavior does not allow me to use the items field which is available in PowerPoint.SlideCollection, and all other collections. I see two issues:

1. items is not included in the props argument for the context.load method in production. But it seems that the OfficeMock is executing the navigational properties to be explicitly available
2. It seems like OfficeMock does not handle the items array well (see bellow code) from what I could tell, any items in the array do not get turned into an officeMock object.

Steps to Reproduce

run this test

const mockData = {
    context: {
        presentation: {
            slides: {
                items: [{
                    id: "a1",
                    tags: { key: "mock", value: "mock" },
                }]
            }
        },
    },
    run: async function (callback) {
        await callback(this.context);
    },
}


describe("unable to mock powerpoint object correctly", () => {
    beforeAll(() => {
        window.PowerPoint = new OfficeMockObject(mockData, "powerpoint");
    })
    test("unable to complete", async () => {
        await window.PowerPoint.run(async (context) => {
            context.presentation.load("slides/id") // ERROR: Property id needs to be present in object model before load is called
            await context.sync()
            expect(context.presentation.slides.items[0].key).toEqual("a1") 
        })
    })
})

Please provide detailed steps for reproducing the issue.

1. copy this code in .test.js file, I use vitest but jest should work just fine.
2. run the test
3. you will get the following error Error: Property id needs to be present in object model before load is called

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

• Operating System: macOS 14.0 (23A344)
• Node version: v20.16.0
• Office version: N/A
• Tool version: N/A
• Office-Addin-Mock version: 2.4.5

Failure Logs

Error: Property id needs to be present in object model before load is called.
  ❯ OfficeMockObject.loadScalar node_modules/office-addin-mock/src/officeMockObject.ts:144:13
  ❯ OfficeMockObject.loadNavigational node_modules/office-addin-mock/src/officeMockObject.ts:130:34
  ❯ node_modules/office-addin-mock/src/officeMockObject.ts:106:16
  ❯ OfficeMockObject.loadMultipleProperties node_modules/office-addin-mock/src/officeMockObject.ts:105:10
  ❯ node_modules/office-addin-mock/src/officeMockObject.ts:48:12
  ❯ OfficeMockObject.load node_modules/office-addin-mock/src/officeMockObject.ts:47:16
  ❯ callback src/power-point/tools/tests/slide-locator.unit.test.js:32:34
      30| 
      31|         await window.PowerPoint.run(async (context) => {
     32|             context.presentation.load("slides/id") // Property id need…
          |                                  ^
      33|             await context.sync()
      34|             expect(context.presentation.slides.items[0].key).toEqual("…
  ❯ OfficeMockObject.run src/power-point/tools/tests/slide-locator.unit.test.js:19:15

Start by running the reproduction in src/power-point/tools/tests/slide-locator.unit.test.js and trace OfficeMockObject.load through loadMultipleProperties, loadNavigational, and loadScalar at the reported source locations. Done means the slides/id load succeeds and context.presentation.slides.items exposes the supplied entry as a usable mock object without the missing-id error.