Which test cases are written first: white boxes or black boxes?

Generally, black box test cases are written first and white box test cases later. To write black box test cases we need the requirement documents and design or project plan. All these documents are easily available in the earlier phase of the development. A black box test case does not need functional design of the application but white box testing needs. Structural design of the application is clearer in the later part of project, mostly while executing or designing. For black box testing you need to only analyze from the functional perspective which is easily available from a simple requirement document.

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Which test cases are written first: white boxes or black boxes?