test: More robust snippet testing

[iwoplaza]

If we need it, there's a way to more granularly test expressions and statements.

Testing expressions

import { CAPTURE, extractSnippetsFromFn } from 'typegpu-testing-utility';

// ...

function foo() {
  'use gpu';
  return 5 + (CAPTURE(6 + 7));
  //                  ^^^^^
}

expect(extractSnippetsFromFn(foo)[0]!.dataType.type).toMatchInlineSnapshot('abstractInt');

Testing statements

import { CAPTURE_FOLLOWING, extractSnippetsFromFn } from 'typegpu-testing-utility';

// ...

function foo() {
  'use gpu';
  CAPTURE_FOLLOWING();
  return 5 + 6 + 7;
  // ^^^^^^^^^^^^^^
}

expect(extractSnippetsFromFn(foo)[0]!.dataType.type).toMatchInlineSnapshot('void');

[pullfrog]

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