Added ITestOutputHelper to A11y tests

[WolfyUK]

Context

HTTP errors due to misconfigured A11y tests were being consumed by the application making debugging difficult.

Change proposed in this pull request

Output HTTP responses to the ITestOutputHelper to give better visibility over what the A11y tests are doing.

Guidance to review

Running the A11y tests locally should output all HTTP responses.

Checklist

• [ ] Work items have been linked (use AB#)
• Your code builds clean without any errors or warnings
• You have run all unit/integration tests and they pass
• Your branch has been rebased onto main
• You have tested by running locally

[jrabbott]

This doesn't feel right. If we're wanting to set the output helper in the WebDrover then I'd suggest not set it as a IClassFixture.

Instead I would pass the output helper explicitly in the constructor for the WebDriver. Then follow constructor/disposal pattern for the test class.

https://xunit.net/docs/shared-context

[jrabbott]

We shouldn't be use IClassFixture for WebDriver if we need to set dependencies.

[WolfyUK]

We shouldn't be use IClassFixture for WebDriver if we need to set dependencies.

Doing in the IClassFixture doesn't work - it seems as though this is the only pattern that does:

• https://stackoverflow.com/a/59222453/504477
• Can output be captured from within IClassFixture<T>? xunit/visualstudio.xunit#214

Happy to swap out IClassFixture completely if that is deemed acceptable?

[jrabbott]

We could probably clean up the page assessment, but something for a future change.