Add AJAX spec helper functions for getting specific request.

Description

Some more spec helpers to help with tests I'm working on in an edx-platform PR.

Steps to Reproduce

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Current Behavior

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Expected Behavior

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Reason for Variance

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Release Notes

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User Impact Summary

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Status

Assignee

Unassigned

Reporter

Uman Shahzad

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Customer

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URL

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Contributor Name

Uman Shahzad

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Actual Points

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Category of Work

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Platform Map Area (Levels 1 & 2)

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Platform Map Area (Levels 3 & 4)

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Story Points

2

Priority

CAT-3
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